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View Full Version : Lipo Fire Incidents and How they Occur


hoppy
10-06-2005, 04:45 AM
Disclaimer: It should be noted that Incidents reported as Undetermined and Unknown are due to the lack of forensic evidence being supplied. Spontaneous lithium incidents, while frequently claimed, have never been verified. All incidents associated with batteries have a cause. Moderator


This represents posts that I have seen where a LiPo pack has caught fire. They have been placed in several categories.

FIRE DURING CHARGING:
Operator Error-
9s pack catches fire while being charged at 10s setting. (9)
2s pack catches fire being charged as 3s (10)
2s pack catches fire when charged at 3s setting (13)
2s pack catches fire in plane while charging at 3s setting. (22)
3s pack charged at 4s voltage ignites (27)
2s pack catches fire charged at 3s (30)
2s pack ignites when charged at 10.2V (31)
Overcharged battery (34)
2s pack charged at 11.1V catches fire. (36)
2s pack charged at 3s setting (40)
2s pack charges at 11.1V burns – (44)
2s charged at 11.2V goes off in garage – (47)
2s charged at 3s voltage ignites in garage – (49)
2s charged at 3s ignites in workshop – (52)
Another count problem – Heli burns (57)
Cell count error caused fire – (61, 62)
Pack charged on NiCd setting - (66)
Run Down pack catches fire during charge – (71)
LiPo Burns during charge on 109 charger after mode mis-set (82)
Charging slightly swelled pack causes fire (86)
Li-Ion cells catch fire from charger setting error (88)
Cell catches fire during attempt to repeak - (91)
Charging puffed cell causes it to ignite – (93)
Lipo burns during attempt to restore overdischarged cell with CC/CV PS (94)
Pack ignites during charging – smoke corrodes shed and contents (98)
Possible damaged pack burns like rocket in can – (100)
Attempt to recharge dead lipo causes plane fire (103)
Charging probably fully charged 3s pack with Astro 109 result in pack ignition. (104)
2s charged as 3s ignites in safe (109)
Restart of charger resulted in wrong charge mode – (113)
Wrong charger settings burns 2 packs – (112)
LiPo burns in modelers hand after charging - (115)
Charging slightly puffed cell causes fire, plane burns (117)
Owner forgot to change charger setting from NiCd to Lipo during charging cycle (118)

Undetermined Cause While Charging
Fire damages garage while charging pack. (7)
1500 3s pack catches fire during 1A , 11.1V initial charge. (1)
2 cell pack ignites while being charged with 2 cell charger. (11)
Car burns when pack being charged in car catches fire. (24)
2s2p pack catches fire in helicopter - possible that charger misread # of cells. (25)
2s pack ignites while on charger set for 2s. (28)
$30,000 damage to house when pack ignites during charging. (no details) (43)
3s pack burns in garage - (35)
3s pack burns at correct settings- (41)
3s pack burns at correct charger settings - (46)
3s 8000mah pack catches fire after 15min - correct settings - (53)
Helicopter and pack burns after 15min charge - (54)
Automatic cell count charger - pack catches fire (55)
Automatic cell count charger - pack catches fire (56)
Lipo rockets across room (58)
Automatic cell count charger - Lipos burn in garage (59)
Battery ignites in car seat during charging (63)
Damaged battery ignites during charge (67)
Pack balloons during charge, burns while under water (68)
11s3p pack burns during charging at correct parameters (70)
Another charging fire - (72)
Helicopter burns when LiPo ignites during charge (73)
Undetermined cause to LiPo fire during charge - (74)
Chopper burns from charging LiPo fire (76)
House fire (81)
3s Pack Ignites burning front of car during charge at correct settings. (83)
Helicopter in garage burns while charging (106)
Well used Lipo ignites under correct charging parameters (107)
SUV Vehicle burns (114)

FIRE FROM PACK DAMAGE:
Cell poked with exacto knife catches fire- (2)
Dog bites pack, pack catches fire (4)
Lexus burns after pack from crashed plane put in car. (8)
Ballooned pack ignites when punctured. (20)
Repaired pack catches fire when connected to plane. (29)
Pack catches fire after plane crashes. (37)
Pack cut while shrink wrapping (39)
Pack punctured during crash burns. (64)
Plane crashes, pack removed and 10 minutes later burns (65)
Battery pack at 1V ignites while charging (71)
Puffed pack ignites during charging – (77)
Puffed Pack smokes when punctured (79)
Nicked pack catches fire (87)
Plane crashes, battery catches fire (89)
Damaged pack catches fire – (90)
Dog chews pack, chars pillow and smokes house - (95)
Battery compartment screw penetrates pack causing loss of plane (102)
Pack balloons dring mischarge, ignites when punchured (108)
Pack ignites 20 min after Heli crash – (111)\
Nicked pack “explodes in modelers hand” (116)

BATTERY SHORTED FIRES:
Shorted pack catches fire (26)
Pack burns after shorting (15)
Possible Short (38)
Shorted when moved on table – (42)
Pack Shorted putting connector on and burns – (45)
Shorted pack burns hole in BMW seat – (48)
Crash causes 3s pack to short and burn – (50)
Pack ignites sometime after connector shorted for a short time (85)

CAUSE UNDETERMINED:
Multi cell pack catches fire in flight (5)
Possible over discharge (33)
Lipo pack catches fire in car (60)
2s pack starts house fire (84)
In flight F3A fire reported (92)
New pack partially burns sitting on desk (96)
Pack ignites with no known cause (97)
Pack ignites after soldering wires on (101)
Pack catches fire in pick up truck (105)OTHER
2s pack connected in series with 3s pack ignites in fireball (78)
Lipo burns garage (99)
Packs used in parallel catch fire in flight (110)

hoppy
10-06-2005, 04:47 AM
1. http://www.rcgroups.com/forums/showthread.php?postid=1625193#post1625193
2. http://www.rcgroups.com/forums/showthread.php?s=&threadid=167748&perpage=30&pagenumber=18
3. http://www.rcgroups.com/forums/showthread.php?postid=1531337#post1531337
4. http://www.rcgroups.com/forums/showthread.php?postid=1531599#post1531599
5. http://www.bayrc.com/boards/viewtopic.php?t=226
6. http://www.rcgroups.com/forums/attachment.php?s=&postid=1478616
7. http://www.rcgroups.com/forums/showthread.php?s=&threadid=71223&highlight=lithium+fire+explosion
8. http://www.rcgroups.com/forums/showthread.php?s=&threadid=140641&highlight=lexus+fire
9. http://www.rcgroups.com/forums/showthread.php?s=&threadid=154540&highlight=funtana+fire
10. http://www.rcgroups.com/forums/showthread.php?s=&threadid=117889&highlight=rocket
11. http://www.ikarus-modellbau.de/ubbthreads/showflat.php?Cat=&Number=186834&page=0&view=collapsed&sb=5&o=&fpart=1
12. http://www.rcgroups.com/forums/showthread.php?s=&threadid=145018&highlight=lipo+fire
13. http://www.rcgroups.com/forums/showthread.php?s=&threadid=160086
14. http://www.rcgroups.com/forums/showthread.php?s=&threadid=160079
15. http://www.rcgroups.com/forums/showthread.php?s=&threadid=160551
16. http://www.rcgroups.com/forums/showthread.php?s=&threadid=157122&highlight=lipo+fire
17. http://www.rcgroups.com/forums/showthread.php?s=&threadid=157388&highlight=lipo+fire
18. http://www.rcgroups.com/forums/showthread.php?s=&threadid=151687&highlight=lipo+fire
19. http://www.rcgroups.com/forums/showthread.php?s=&threadid=151916&highlight=lipo+fire
20. http://www.rcgroups.com/forums/showthread.php?s=&threadid=139208&highlight=lipo+fire
21. http://www.rcgroups.com/forums/showthread.php?s=&threadid=150533&highlight=lipo+fire
22. http://www.rcgroups.com/forums/showthread.php?s=&threadid=145018&highlight=lipo+fire
23. http://www.rcgroups.com/forums/showthread.php?s=&postid=806402#post806402
http://www.rcgroups.com/forums/showthread.php?s=&threadid=96934&highlight=lipo+fire
http://www.rcgroups.com/forums/showthread.php?s=&threadid=88923&highlight=lipo+fire
24. http://www.hornet-heli.com/ubb/Forum3/HTML/003428.html
25. http://www.rcgroups.com/forums/showthread.php?s=&threadid=59306&highlight=explosion
26. http://www.rcgroups.com/forums/showthread.php?postid=1243595#post1243595
27. http://www.rcgroups.com/forums/showthread.php?postid=1571890#post1571890
28. http://www.rcgroups.com/forums/showthread.php?postid=1581630#post1581630
29. http://www.rcuniverse.com/forum/fb.asp?m=1049325&tostyle=tm
30. http://www.rcgroups.com/forums/showthread.php?postid=844129#post844129
31. http://www.rcgroups.com/forums/showthread.php?postid=1553429#post1553429
32. http://www.rcgroups.com/forums/showthread.php?postid=1658165#post1658165
http://www.rcgroups.com/forums/showthread.php?s=&threadid=185530
33. http://www.rcgroups.com/forums/showthread.php?postid=1699734#post1699734
34. http://www.rcgroups.com/forums/showthread.php?postid=1731091#post1731091
http://www.rcgroups.com/forums/showthread.php?postid=1731915#post1731915
35. http://www.rcuniverse.com/forum/fb.asp?m=1416352&tostyle=tm
36. http://members.jcom.home.ne.jp/4223215501/Lithium%20Polymer%20trouble.htm
http://www.rcgroups.com/forums/showthread.php?postid=1761331#post1761331
Charging crashed pack caused pack unbalance problems - http://www.rcgroups.com/forums/showthread.php?postid=1767503#post1767503
37. Pack catches on fire after crash - http://www.rcgroups.com/forums/showthread.php?postid=1779434#post1779434
38. Possible short – undamaged pack catches fire -http://www.rcgroups.com/forums/showthread.php?postid=1810304#post1810304
39. Battery shorts and burns during shrink wrapping - http://www.rcgroups.com/forums/showthread.php?postid=1399608#post1399608
Lipo Fire Video’s
http://www.rcgroups.com/forums/showthread.php?postid=1394715#post1394715
http://www.rcstuff.us/battery/lipo/lipo_DNA.html
http://www.helihobby.com/videos/LithiumBattery.wmv
Threads they came from:
http://www.rcgroups.com/forums/showthread.php?s=&threadid=160079&highlight=lipo+fire+video
http://www.rcgroups.com/forums/showthread.php?s=&threadid=151687&perpage=15&pagenumber=1
(40) Battery catches fire, wrong charging voltage - http://www.rcgroups.com/forums/showthread.php?postid=1898922#post1898922
(41) First charge of pack - http://www.rcgroups.com/forums/showthread.php?s=&threadid=180434
(42) Pack shorted on bench - http://www.rcgroups.com/forums/showthread.php?s=&threadid=206095
(43) $30,000 house damage – charger error - http://www.rcgroups.com/forums/showthread.php?postid=1816790#post1816790
(44) 2s charged at 11.1V burns - http://www.rcgroups.com/forums/showthread.php?postid=1844047#post1844047
(45) Pack Shorted putting connector on and burns - http://www.rcgroups.com/forums/showthread.php?s=&threadid=209532
(46) 3s Pack burns at correct charger settings - http://www.rcgroups.com/forums/showthread.php?s=&threadid=209767
Picture of burned bench – German site - http://www.modellflugjugend.de/archiv/user/lipo2.jpg
(47) 2s charged at 3s goes boom in garage - http://www.rcgroups.com/forums/showthread.php?s=&threadid=100803
(48) Shorted pack burns hole in BMW seat - http://www.rcgroups.com/forums/showthread.php?postid=1199486#post1199486
(49) 2s charged as 3s ignites in house - http://www.rcgroups.com/forums/showthread.php?s=&threadid=117889&highlight=rocket

hoppy
10-06-2005, 04:47 AM
(50) Crash causes 3s to short and burn
http://www.rcgroups.com/forums/showthread.php?postid=1863182#post1863182
(52) 2s charging at 3s causes fire in garage -
http://www.runryder.com/helicopter/...light=fire+lipo
(53) 8000 3s pack catches fire at correct settings -
http://www.runryder.com/helicopter/...light=fire+lipo
(54) Pack catches fire after charging for 15 min -
http://www.rotory.com/ubbthreads/sh...o=&fpart=1&vc=1
(55) Pack catches fire using automatic charger - http://www.rcgroups.com/forums/showpost.php?p=2060026&postcount=15
(56) Pack catches fire using automatic charger -
http://www.rcgroups.com/forums/showpost.php?p=2059446&postcount=1
(57) Helicopter fire - http://runryder.com/helicopter/t82226/?goto=newpost
(58) LiIon pack rockets across room: http://www.rcgroups.com/forums/showpost.php?p=2180976&postcount=11
(59) Dented Pack Catches fire - http://www.rcgroups.com/forums/showpost.php?p=2272656&postcount=3
(60) Lipo in closed car catches fire - http://www.rcgroups.com/forums/showthread.php?t=241627
(61) Wrong cell count fire - http://www.rcgroups.com/forums/showpost.php?p=2294797&postcount=3
(62) Wrong cell count fire – http://www.rcgroups.com/forums/showpost.php?p=2295326&postcount=1
(63) Battery catches fire in car seat while charging - http://www.rcgroups.com/forums/showthread.php?t=248194
(64) Battery catches fire when plane crashes - http://www.rcgroups.com/forums/showthread.php?t=256098
(65) Battery catches fire after crash: http://www.rcgroups.com/forums/showpost.php?p=2433797&postcount=12
(66) Battery ignites in under 10min on charger - http://www.rcgroups.com/forums/showpost.php?p=2465659&postcount=1
(67) Damaged battery catches fire during charging - http://www.rcgroups.com/forums/showpost.php?p=2301234&postcount=5
(68) LiPo Pack catches fire even tho immersed in salt water - http://www.rcgroups.com/forums/showthread.php?t=261922
(69) Lipo ignition causes house fire - http://www.rcgroups.com/forums/showpost.php?p=2490250&postcount=4
(70) Pack catches fire for no apparent reason during charge - http://www.rcgroups.com/forums/showpost.php?p=2495111&postcount=34
(71) Pack at 1V charged and catches fire - http://www.rcgroups.com/forums/showthread.php?t=263600
(72) Battery catches fire during charging - http://www.rcgroups.com/forums/showpost.php?p=1271421&postcount=1
(73) Helicopter burns - http://www.rcgroups.com/forums/showthread.php?t=266337
(74) 3s Pack ignites during charge - http://www.rcgroups.com/forums/showthread.php?t=266875
(75) House fire reported in Belgium - http://www.rcgroups.com/forums/showpost.php?p=2543031&postcount=24 CHECK OUT
(76) Plane burns during charge - http://www.rcgroups.com/forums/showpost.php?p=2546405&postcount=47
(77) Puffed pack ignites during charging - http://www.rcgroups.com/forums/showthread.php?p=2560964#post2560964
(78) 2s pack connected in parallel to 3s pack ignites - http://www.rcgroups.com/forums/showthread.php?t=274028
(79) Ballooned Pack Burns when punchured - http://www.rcgroups.com/forums/showthread.php?t=274557
(80) 7s pack catches fire during flight - http://www.rcgroups.com/forums/showthread.php?t=296507
(81) House fire – 3rd story burns - http://runryder.com/helicopter/t145397p1/
(82) Lipo catchs fire during charge on 109 charger. http://www.rcgroups.com/forums/showthread.php?t=307806
(83) 3s Lipo catches fire at correct settings. http://rcgroups.com/gallery/showphoto.php?photo=12390&sort=1&cat=500&page=1
(84) 2s pack starts house fire- reason unknown - http://www.rcgroups.com/forums/showthread.php?t=311323
(85) Pack catches fire after a short short - http://www.rcgroups.com/forums/showthread.php?t=311213#post3044752
(86) Charging slightly swelled pack causes fire - http://www.rcgroups.com/forums/showpost.php?p=3061077&postcount=4
(87) Nicked cell catches fire - http://www.rcuniverse.com/forum/LiPo_performance_decrease%3F/m_2359419/tm.htm#2366986
(88) Li Ion cells ignite from charging mistake -
http://www.rcuniverse.com/forum/LiPo_Fatality/m_2413656/tm.htm#2427714
(89) Battery ejected from crashed plane burns - http://www.rcgroups.com/forums/showthread.php?t=289255
(90) Battery involved in crash ignites several weeks later -
http://www.rcgroups.com/forums/showthread.php?t=273490
(91) Charging abuse causes fire - http://www.rcgroups.com/forums/showpost.php?p=2672835&postcount=7
(92) Pack fire during F3A contest - http://www.rcgroups.com/forums/showpost.php?p=2673568&postcount=11
(93) Slightly puffed cell catches fire during charging. http:// http://www.rcgroups.com/forums/showpost.php?p=3462136&postcount=14www.rcgroups.com/forums/showthread.php?t=268523
(94) Lipo burns during attempt to restore overdischarged cell with CC/CV PS - http://www.rcgroups.com/forums/showthread.php?t=323693
(95) http://www.rcgroups.com/forums/showpost.php?p=3186334&postcount=15
(96) New pack partially burns sitting on desk - http://www.rcgroups.com/forums/showthread.php?t=329744
(97) Pack ignites with no known cause - http://www.rcgroups.com/forums/showpost.php?p=3334583&postcount=31
(98) Pack ignites during charging – equipment in shed corrodes - http://www.rcgroups.com/forums/showpost.php?p=3339022&postcount=177 and http://www.rcgroups.com/forums/showpost.php?p=3340471&postcount=187
(99) Lipo burns garage - http://www.rcgroups.com/forums/showpost.php?p=3462136&postcount=14
(100) Lipo burns like rocket in a can during charging - http://www.rcgroups.com/forums/showthread.php?t=356474
(101) Cell ignites while soldering- http://www.rcgroups.com/forums/showthread.php?t=357380
(102) Screw penetrates pack igniting it - http://www.rcgroups.com/forums/showthread.php?t=360222
(103) Attempt to recharge “dead pack” causes plane fire - http://www.rcgroups.com/forums/showpost.php?p=3620937&postcount=9
(104) Charged 3s (?) ignites while recharging with Astro 109 - http://www.rcgroups.com/forums/showthread.php?t=362011
(105) Packs in truck catch fire, burn truck – unexplained - http://www.rcgroups.com/forums/showthread.php?t=368758
(106) Battery charging inside of helicopter catches fire in garage. No cause determined. http://www.runryder.com/helicopter/t177482p1/
(107) Well used Lipo ignites during charging under correct conditions - http://www.rcgroups.com/forums/showthread.php?t=373643
(108) Lipo charged as NiCd burns when the ballooned pouch is punchured - http://www.rcgroups.com/forums/showthread.php?t=374510#post3794339
(109) Charging 2s1500 with possible wrong cell count ignites in safe - http://www.rcgroups.com/forums/showthread.php?t=376620#post3829205
(110) Packs used in parallel catch fire in flight - http://www.rcgroups.com/forums/showthread.php?t=378566
(111) Helicopter crashes – 20 minutes later, lipos burn - http://www.rcgroups.com/forums/showthread.php?t=384490
(112) 2 packs at wrong charger settings burn - http://www.rcgroups.com/forums/showthread.php?t=384585
(113) Charger unplugged, on restart it went into different mode – lipo burns- http://www.rcgroups.com/forums/showpost.php?p=4036945&postcount=1
(114) Battery charged in SUV burns vehicle - http://www.wattflyer.com/forums/showpost.php?p=5209&postcount=1
(115) Battery ignites after charging in modelers hand http://www.rcgroups.com/forums/showpost.php?p=4285483&postcount=1
(116) Nicked pack “explodes in hand” http://www.rcgroups.com/forums/showpost.php?p=4352256&postcount=155
(117) Charging slightly puffed lipo causes it to ignite in plane. http://www.rcgroups.com/forums/showthread.php?t=434713
(118) Using NiCd setting causes LiPo to burn in garage - http://www.rcgroups.com/forums/showthread.php?t=435043 (http://www.rcgroups.com/forums/showthread.php?t=435043)

Tweet
10-06-2005, 06:08 AM
Well, some of these are easy to draw conclusions from of course. I guess the bottom line is treat lipolys with respect and understand that many things in life entail some risk.

Unbalanced prop
10-06-2005, 01:17 PM
I have never had an incident with lipols..........(knock on wood), but I think the most important thing is to not become COMPLACENT!!! Check you settings twice and once more for the heck of it and MONITOR the charge progress. Just my $.02

BTW: Thanks Hoppy for keeping such extensive and organized records and welcome to wattflyer.!!!:D

Doug

Matt Kirsch
10-06-2005, 05:35 PM
Knowing human nature to not own up to one's mistakes and/or simply be blind to one's own complacency, you could probably move most of the "Unknown" and "Undetermined" cases over into the "Pack Damaged" or "Pack Shorted" categories. I'm sure a few would also qualify for a new category, "Defective from Manufacturer." But of course, that would assume you could read minds and travel through time and space at will to witness the failures and the events leading up to said failures...

qban_flyer
10-06-2005, 06:11 PM
I have never had an incident with lipols..........(knock on wood), but I think the most important thing is to not become COMPLACENT!!! Check you settings twice and once more for the heck of it and MONITOR the charge progress. Just my $.02

BTW: Thanks Hoppy for keeping such extensive and organized records and welcome to wattflyer.!!!:D

Doug

I've been using Li-Pos since they first became available from Thunder Power & KOKAM. I am extra careful when selecting the pack to be charged from the charger's memory bank as it is the area where mistakes are easily made.

Never had a problem with any of my Li-Pos, though I saw a Twinstar go up in flames when the idiot flying it was using a single, older version T/P 2100mAh pack driving two speed 400 type motors spinnig Gunther carbon fiber props. They were drawing in excess of 18 amps and he knew full well the battery in use was designed for a maximum discharge rate of 12.6 amps. It was a spectacular sight, though. When Li-Pos get abused they'll let you know in no uncertain terms.

I agree with you 100%, before anyone hits the 'charge' button make sure the charger is set up correctly for the specific pack being charged. Failure to do so will invariably result in disaster, especially with Lithium packs.

I also have made it a practice to charge my Li-Pos at a rate of 70% of 1C. Another important fact some people ignore for the sake of saving a few bucks is the use of not so reliable, "CHEAP" Li-Po chargers. I don't trust any charger under $100 regardless of what type of battery I plan on charging or who the maker of the charger happens to be.

With Li-Po chargers, you get what you pay for. With Li-Po batteries, if not careful with them you'll surely get burned.

hoppy
10-06-2005, 06:33 PM
I have never had an incident with lipols..........(knock on wood), but I think the most important thing is to not become COMPLACENT!!! Check you settings twice and once more for the heck of it and MONITOR the charge progress. Just my $.02

BTW: Thanks Hoppy for keeping such extensive and organized records and welcome to wattflyer.!!!:D

Doug

Thanks Doug,
I know you have a strong regard for lipo safety from your posts on RCG.

The listing does show that the Vendor warnings are not just legalese but do need to be addressed. Those Vendor warnings by the way, most likely resulted from the efforts of many of us to bring the dangers of lipo cells to the forefront over the past few years. As you know, when lipos first came out they were advertised as being very safe.

The list is meant to be a tool to identify problem areas and hopefully prevent similar incidents from happening by educating users on how and why incidents have occurred. Hopefully we can all learn from other peoples experiences.

Tweet
10-06-2005, 08:14 PM
So what exactly is your point here? I think that with all the information on vendors' websites we all know that LiPo's can, under some circumstances, be a hazard. Is your goal just to frighten people or do you have another point that is useful?

I think the data itself is useful. Everyone can draw their own conclusions. This just emphasizes that there are real consequences to inattention, as is true in most areas of flying.

qban_flyer
10-07-2005, 12:38 AM
I think the data itself is useful. Everyone can draw their own conclusions. This just emphasizes that there are real consequences to inattention, as is true in most areas of flying.

So well put. This past Monday, an experienced 'gas' flyer broke two fingers and the thumb of his right hand when the plane he was working on lurched forward and he 'tried' to stop it with his gloved hand. The monster plane had a 28X10 wooden propeller on its nose.

Six hours at the hospital and 76 stitches later, he knows he won't be flying the rest of the year because of lack of attention to securing the model properly. And idiot? Nope, the man borders on the brilliant. Absent minded while messing with that model? Absolutely yes!

My Point? Disastrous consequences will follow when Li-Po packs are improperly charged and or mishandled. Lithium batteries should be handled with the respect they deserve.

Heidelberg Germany Flyer
10-12-2005, 08:56 PM
Hey, you got my attention! I really appreciated seeing the list!!

For someone who is new to using Lipos, what are the essential do's and not to do's...

From the list it doesn't look like there are too many to discuss.

* Obviously, charging on the wrong cell count is a major not to do!

(From now on I'll be certain that the cell count is correct)

* Check out the Lipo after a crash to see if it is damaged, an important to do!

(What is considered damage, to the point it shouldn't be used anymore?)

What about storage?

I've been using small nylon bags to keep them from shorting out and carrying them in a soft hand bag in the car.

(Sounds like an accident waiting to burn)

What should I be doing?

Overused Lipos?

(I was given an old Lipo by a friend. When is it considered too old?)

Other dangers?

(The other day I noticed sharp screws sticking up from the floor of the plane under the Lipo and cut them off).

Wanting to be safer...

Heidelberg Germany Flyer

hoppy
10-12-2005, 09:43 PM
What about storage?
1/2 charge and cool if over a couple of weeks of non-use expected.

Overused Lipos?
I've seen where they say when capacity drops to 80% of what it was to begin with, it's time to retire them....your measured mah, not the claimed.

Other dangers?
Don't charge a puffed or damaged cell.


* Check out the Lipo after a crash to see if it is damaged, an important to do!
Hard to say how much is too much damage. When it smells sweet, it's a goner. When it puffs it's a goner. Any pouch tears - goner.


Other things-
Keep packs balanced - check them every so often.
Do not discharge below 3V/cell under load.



I charge, store, and transport my lipo's in a metal box away from flammable materials if possible so that if an ignition occurs, it is limited to the lipo.

ragbag
10-12-2005, 09:50 PM
One of my associates shot himself in the leg while practicing quick draw.
As many people want to do they want to ban guns.. Some people get very serious injuries riding their bikes on the highway. some people get killed riding their motocycles on the highway and offroad. We play our games and we take our chances.
Why do we always want to blame the other for our mistakes. Oh, the one who shot himself in the leg was practicing quick draw for cowboy action shooting, single action revolver, cut away holster, had the trigger pulled before he cleared the holster, a nono, improper equipment. Couldn't have happened if he had the right holster. He broke one of the rules and paid.

Read and follow the instructions, someone went to a lot of trouble to keep us out of trouble.
Oh, yes, three years and I finaly wired a deans backwards. Let the smoke out of the little black box.
New 3s1500 and Phoenix 25.
By george

qban_flyer
10-13-2005, 12:24 AM
Hey, you got my attention! I really appreciated seeing the list!!

For someone who is new to using Lipos, what are the essential do's and not to do's...

From the list it doesn't look like there are too many to discuss.

* Obviously, charging on the wrong cell count is a major not to do!
(From now on I'll be certain that the cell count is correct)
This applies to all types of batteries regardless of make.

* Check out the Lipo after a crash to see if it is damaged, an important to do!
(What is considered damage, to the point it shouldn't be used anymore?)
I have seen KOKAMs 'accordioned' (squished badly) after a really bad crash. We observed them for 35 minutes while they were sitting on concrete with a bucket of sand nearby. Nothing happened, though the pack was disposed off properly afterwards.


What about storage?
I've been using small nylon bags to keep them from shorting out and carrying them in a soft hand bag in the car.
(Sounds like an accident waiting to burn)
It's not a good idea to carry them around in bags of any type. They should be carried inside solid containers. I don't mean concrete bunkers, but hard pastic tool boxes should do just fine.

What should I be doing?

Overused Lipos?
(I was given an old Lipo by a friend. When is it considered too old?)
They haven't been aroung long enough to have seen any 'overused' ones. I have seen many 'abused' ones, though. According to the experts they should last for about 400 - 500 charge and discharge cycles. That's quite a long time. I suppose when they begin to achieve/retain less than a full charge (70% and under) it is about time to consider replacing them (this applies to all types, not just Li-Pos).

Other dangers?
(The other day I noticed sharp screws sticking up from the floor of the plane under the Lipo and cut them off).
Good practice as Li-Pos won't tolerate puncturing. It's considered abuse and it can lead to an explosion and or a fire.

Wanting to be safer...

Heidelberg Germany Flyer

Take care and happy flying

Heidelberg Germany Flyer
10-13-2005, 07:10 PM
Thanks for the advice...

Did you really mean for me to use hard plastic tool box and not a metal one?

Last night I pulled out my warnings from the lipo batteries and carefully read them. I can't believe that it clearly states that when you are finished charging you are to disconnect from the car battery connection before you disconnect the Lipo battery. Of course I've been pulling out lipo connection first and then disconnecting from the car battery afterwards. (I think it is because of my computer training)

I'm sure that your experienced flyers know this, but this is another careless habit that I developed as a new flyer! There is no excuse for doing anything wrong while charging as most of the fires and explosions on the list were because of human mistakes.

Heidelberg Germany Flyer

qban_flyer
10-18-2005, 06:10 AM
Thanks for the advice...

Did you really mean for me to use hard plastic tool box and not a metal one?
Plastic ones won't cause them to ignite if the connectors come in contact with the container. A metal one, being conductive will exacerbate the risk of a short and or a fire.

Last night I pulled out my warnings from the lipo batteries and carefully read them. I can't believe that it clearly states that when you are finished charging you are to disconnect from the car battery connection before you disconnect the Lipo battery. Of course I've been pulling out lipo connection first and then disconnecting from the car battery afterwards. (I think it is because of my computer training)

I'm sure that your experienced flyers know this, but this is another careless habit that I developed as a new flyer! There is no excuse for doing anything wrong while charging as most of the fires and explosions on the list were because of human mistakes.

Heidelberg Germany Flyer

I disconnect mine the same way you have been disconnecting yours. So far no problems encountered. I have yet to read that type of warning on a Li-Po pack or any site related to batteries.

I tend to think that people make Li-Po packs appear to be more dangerous than they really are. I guess manufacturers and re-sellers do so as a disclaimer in order to free themselves from a possible lawsuit.

Treating Li-Pos with the same respect as we do other types will suffice. They are like a car, a knife or a can opener. Properly handled they are harmless and useful implements. If you are careless with them something is bound to happen sooner or later.

Geoff_Gino
10-18-2005, 06:38 AM
Geoff Gino,
I totally agree, pEOPls cAn be Stuupids SOmtiims. I mean it's right there usually either in the package or on the lipo itself. What do people think now days.
Nova

OK - How's this for STUPID.
Flew this week end and was having a great time at a fairly busy club. Was in hurry to get back up in the air and disconnected a battery that was on charge and plugged in the next one and noticed smoke from one of them.

Was in such a hurry that without looking had plugged the 2 batteries together instead of the discharged one into the charger and my haste has cost me LiPo that was now completly dangerous and has to be discarded.

Old saying "less haste, less waste"

We all make mistakes but need to be "man" enough to admit to be wrong sometimes and not always blame the equipment.

Geoff

qban_flyer
10-18-2005, 06:51 AM
OK - How's this for STUPID.
Flew this week end and was having a great time at a fairly busy club. Was in hurry to get back up in the air and disconnected a battery that was on charge and plugged in the next one and noticed smoke from one of them.

Was in such a hurry that without looking had plugged the 2 batteries together instead of the discharged one into the charger and my haste has cost me LiPo that was now completly dangerous and has to be discarded.

Old saying "less haste, less waste"

We all make mistakes but need to be "man" enough to admit to be wrong sometimes and not always blame the equipment.

Geoff

Worse thing that I have done was to charge a Li-Po battery after disconnecting the previously charged one. You may think, what's wrong with that?

The one I removed from the charger was a 2 cell 1320, the one I proceeded to charge was a 2 cell 900! I was lucky to have found out my mistake five minutes into the charge, so nothing disastrous happened that time.

You are correct. At times we are in such a hurry we forget what we are supposed to be doing and that's when bad things happen.

Unbalanced prop
10-18-2005, 01:44 PM
Was in such a hurry that without looking had plugged the 2 batteries together instead of the discharged one into the charger and my haste has cost me LiPo that was now completly dangerous and has to be discarded.

This is exactly why I switched to Deans ultras on all my smaller packs. It is impossible to plug two batteries together using female ultras on the batteries.

Doug

Geoff_Gino
10-18-2005, 03:13 PM
Hi Doug

Funny that it always is a matter of pride. We all at some stage think we can't do wrong. :confused:

You have hit the nail on the head, let's say that I put those packs together in my STUPID days. :(

I have however learnt from my mistakes and I am currently changing all my connectors. :D

Geoff

Unbalanced prop
10-18-2005, 03:23 PM
Hi Geoff

I know that I make mistakes!:o In fact the older I get the more I make. That is the reason I do things like make it impossible to connect to batteries together because if it can be done wrong, I CAN do it wrong.:( I try and make things as much of a no brainer as possible because my brain isn't always fully engaged.

Doug

qban_flyer
10-18-2005, 04:21 PM
Was in such a hurry that without looking had plugged the 2 batteries together instead of the discharged one into the charger and my haste has cost me LiPo that was now completly dangerous and has to be discarded.

I am rather confused by your statement, the one quoted above.

Please, forgive me for sounding stupid but I have a question that has been bugging the daylights out of me. How can anyone hook up two batteries to the same charger using a single charging cable with a single connector on its battery end?

My charging cables (all of them, since I've been in e-flight) will only accept one (1) battery pack exclusively, not two or three, so it is difficult for me to picture what is it that you are talking about. How you managed to plug two battery packs into one single connector is hard to fathom for this old brain.
:confused: :confused: :confused:

Heidelberg Germany Flyer
10-18-2005, 05:05 PM
qban flyer, Thanks for the tip with the plastic container to store the Lipos!

Check www.purehobby.com/SafetyNotes.htm (http://www.purehobby.com/SafetyNotes.htm) for the disconnection advice, it's printed in red...

Keep safety first!


Heidelberg Germany Flyer

Heidelberg Germany Flyer
10-18-2005, 05:16 PM
Was the danger because you were charging at 13 amps instead of 9 amps, as the voltage was still the same (2 cells) and it would cut off at the correct voltage wouldn't it?

DickCorby
10-18-2005, 08:01 PM
I have been using Li-Polys for over 2 years now, and like the first post indicates, the only problems I have had - I have caused. The only fire was when I didn't watch them and had set for over the 1C charge rate after charging a larger MAH pack. I have caught them a couple of time in the shop where I did the same thing, and they turned to sausages, Immediately unplugged them and doused in salt water. This was early on, and since being VERY careful, have had no problem.

They have revolutionized Electric RC, and it looks like they will be around for awhile. I have some packs that are over 2 years old, and still work great after who knows how many flights.

The first thing I did when going to them, was buy an Astro FLight Li-Po charger. I think that this is why I've had so few problems. It wasn't cheap, but does let me know if I am charging correctly. Plus I charge at about 80% of 1C, and also about every month or so run them down using the Discharge function of the Astro Charger.

Second I bought a fireproof box to carry them in. And I keep it in the front seat while driving to and especially from the field. Even if they go into flame, at least I have a handle to grab and throw them somewhere where they might do minimal damage. So far that hasn't happened and hopefully with continued caution, wont happen.

I also only use Anderson powerpoles on all my batteries, They are very good for this use as they protect from ever getting a short, without sticking something in the opening on purpose. Using deans plugs, with the open male ends, I shortd out a pack accidentally on the bench when a metal jewelers screwdriver rolled against them. Didnt burst into flames, but threw the pack away anyway.


There was the same big concern when the Jet guys began using propane on the big Jet powered turbines. There was talk of banning them, special licensing etc. And now they are common place, but the guys operating them have become very safety concious. With Li-Polys we have to do the same.

What would be interesting would be seeing the dateline graph for all the incidents shown. I would wager that as time went on it would show a decline in problems as people got used to them. Nicads can burst into flames also folk.

DickCorby
10-18-2005, 08:10 PM
I think he meant that he plugged 2 packs into each other, instant short and problem.

Another thing to be very careful of. You need to observe polarity and setup your system to not allow this to happen. With Anderson powerpoles and creating a polarization scheme of your own, yu will never make this mistake.

Heidelberg Germany Flyer
10-18-2005, 08:26 PM
Dick, how can he do that?

DickCorby
10-18-2005, 09:49 PM
By not having a good scheme to maintain polarization. I have in the heat of battle plugged my charger into the speed control, and they don't like that, and speed controls aren't cheap. So with the Anderson powerpoles I make sure they cant come apart, making them impossible to plug in wrong. They have a groove in the side of them, and you put in a roll pin that makes sure they don't come apart. Total polarization, and safety.

http://www.powerwerx.com/category.asp?CtgID=3271

qban_flyer
10-18-2005, 10:28 PM
By not having a good scheme to maintain polarization. I have in the heat of battle plugged my charger into the speed control, and they don't like that, and speed controls aren't cheap. So with the Anderson powerpoles I make sure they cant come apart, making them impossible to plug in wrong. They have a groove in the side of them, and you put in a roll pin that makes sure they don't come apart. Total polarization, and safety.

http://www.powerwerx.com/category.asp?CtgID=3271

I quit using Anderson Power Poles three years ago after having one loose contact when the plane was in mid flight. You can imagine the rest of the story.

Three days later while I was back at the field with another plane, a similar situation happened to a felow club member, though in his case the false/intermitent contact made the connection 'so hot' that it began melting the insulation of the wires!

How this story ended? I didn't fly that day, came home and threw all my Power Poles in the trash can (where they belonged to begin with). I now use Deans Ultra and Mini plugs exclusively. Although occasionally I use the Astro "Zero Loss" (?) connectors when flying Astro motors and their ESCs.

qban_flyer
10-18-2005, 10:57 PM
qban flyer, Thanks for the tip with the plastic container to store the Lipos!

Check www.purehobby.com/SafetyNotes.htm (http://www.purehobby.com/SafetyNotes.htm) for the disconnection advice, it's printed in red...

Keep safety first!

Heidelberg Germany Flyer

Thanks for that link. It's an eye opener!

The only other type of storage/carrier I would use is a ceramic one. I have one but besides been rather heavy and cumbersome, people stare at me when I bring my Li-Pos out to the field in what they refer to my "Battery Bunker"!

qban_flyer
10-18-2005, 11:07 PM
I think he meant that he plugged 2 packs into each other, instant short and problem.

Another thing to be very careful of. You need to observe polarity and setup your system to not allow this to happen. With Anderson powerpoles and creating a polarization scheme of your own, yu will never make this mistake.

OUCH!!!

Thanks for the clarification. I just couldn't imagine anyone being able to hook two batteries up to one charging connector or to each other with most of the plugs available today. Enter Power Poles into the equation and I can see what is it he did. I stopped using them three years ago for different reasons, I am glad I did since at times I am rather absent minded and may made the same mistake.

The very reason I use Deans Ultra Plugs. Rather hard to plug two Deans female plugs into one another.

DickCorby
10-18-2005, 11:18 PM
On the anderson powerpole website there is an article on the care and feeding of them. I've been using them for years, and wouldn't have it any other way.

Another thing I do regularly is pull the wire and contact out. Clean the contact with bond paper, or fine crocus cloth if they are real bad. Then before putting them back in, lifting on the spring to make it give better contact.

The most important thing overall is to make sure that you hear a slight click when the contact goes over the spring. This is the only time I've had problems. If the lip of the contact doesn't catch the spring, of course they can back out, and/or vibrate and create heat and possible fire.

I also use the 45 AMP size in any pack where the current might be a problem, usually on any packs bigger than 3S.

In addition, the best way to do the wiring is crimping rather than soldering. That way you don't take a chance of getting solder on the outside of the drum, which will keep it from seating properly. The plugs have come a long way baby! and they are pretty darned good.

The ratings on these plugs is much lower than their capabilities. They are capable of 3000 watts without heating, and have been tested at that level. Way above what our planes should generate.

Another neat thing about them is that you can take off part of the plastic cover (there's a mark for this) and make them even more compact for smaller planes.

I also make it a point to use Astroflight Zero Loss plugs on the motor and the motor output from all my ESC's. Another way to insure polarization within my system.

Maintenance of any part of your package makes the difference between good flying days and bad flying days.

DickCorby
10-18-2005, 11:27 PM
Something else I do is put industrial strength Velcro on the plugs, and the other side to the plane. After plugging them together, I push them down on the velcro, and voila - cant come undone in flight. Just a little added insurance.

qban_flyer
10-18-2005, 11:27 PM
I also use the 45 AMP size in any pack where the current might be a problem, usually on any packs bigger than 3S.

I always used the large ones. One loss of contact was more than I could stomach, so out they went when I lost plane, motor and damaged servos. Astro connectors are nice but rather expensive.

It's a matter of choice though. I'd rather be safe than sorry. Deans offers my often absent mindedness the security of an extremely low probability for a screw up. BTW, I do clean my connector's contacts on a regular basis.

Been doing that with my fancy pants audio system set up for the better part of 47 years. A clean electrical connection is the only good electrical connection.

qban_flyer
10-18-2005, 11:37 PM
Something else I do is put industrial strength Velcro on the plugs, and the other side to the plane. After plugging them together, I push them down on the velcro, and voila - cant come undone in flight. Just a little added insurance.

Good practice to follow with all types of connectors.

Geoff_Gino
10-19-2005, 06:43 AM
I am rather confused by your statement, the one quoted above.

Please, forgive me for sounding stupid but I have a question that has been bugging the daylights out of me. How can anyone hook up two batteries to the same charger using a single charging cable with a single connector on its battery end?

My charging cables (all of them, since I've been in e-flight) will only accept one (1) battery pack exclusively, not two or three, so it is difficult for me to picture what is it that you are talking about. How you managed to plug two battery packs into one single connector is hard to fathom for this old brain.
:confused: :confused: :confused:

Hi Qban

The batt packs in question were for my flat foamy and they are 830 mah so I used Micro connectors. These connectors have one pin sticking out of the plug and the other recessed. My charging plug is (of course) similar.
When I disconnected the batt that was on charge I kept the batt lead in my one hand and took the other batt lead (thinking it was the charger lead) and plugged them together and not both into the charger, saw smoke and immediately broke the connection.

As I said S T U P I D !!!!!

Geoff

qban_flyer
10-19-2005, 11:24 AM
Hi Qban

The batt packs in question were for my flat foamy and they are 830 mah so I used Micro connectors. These connectors have one pin sticking out of the plug and the other recessed. My charging plug is (of course) similar.
When I disconnected the batt that was on charge I kept the batt lead in my one hand and took the other batt lead (thinking it was the charger lead) and plugged them together and not both into the charger, saw smoke and immediately broke the connection.

As I said S T U P I D !!!!!

Geoff

OUCHHH! Expensive mistake.

I see what you mean. I use Deans BLACK Micro ones on the charger end and of course RED on the battery end. Not by design but because I ran out of RED ones when making my charging pigtail. I'm glad I had no more RED ones since it is very easy to make the mistake you made, and being as absent minded as I can be at times, I am sure the same thing could happen to me were it not for the color difference. One thing I don't like about the way those are supposed to be connected is that they have the HOT battery pin exposed all the time.

Sorry to hear of what happened to you. I hope everyone has read your post and learn from it.

Thanks for getting back to me. BTW, I love your avatar!

Unbalanced prop
10-19-2005, 12:59 PM
I am sure the same thing could happen to me were it not for the color difference. One thing I don't like about the way those are supposed to be connected is that they have the HOT battery pin exposed all the time.

Using Deans ultras will solve both of these problems. No exposed pins on the battery and impossible to plug into another battery.

Doug

Heidelberg Germany Flyer
10-19-2005, 04:12 PM
Thanks for that link. It's an eye opener!

The only other type of storage/carrier I would use is a ceramic one. I have one but besides been rather heavy and cumbersome, people stare at me when I bring my Li-Pos out to the field in what they refer to my "Battery Bunker"!


No problem! Just another thing to keep in mind after charging.

With the Lipo storage container... I decided to get a flat heavy metal box that included a light plastic tray holder that allows me to separate storage for each lipo battery- hopefully preventing any metal contact.

I'm not laughing at your Battery Bunker...

Hopefully, I'm setting a safety example for some of our club flyers who walk around with Lipos in their pockets.

qban_flyer
10-19-2005, 06:45 PM
No problem! Just another thing to keep in mind after charging.

With the Lipo storage container... I decided to get a flat heavy metal box that included a light plastic tray holder that allows me to separate storage for each lipo battery- hopefully preventing any metal contact.

I'm not laughing at your Battery Bunker...

Hopefully, I'm setting a safety example for some of our club flyers who walk around with Lipos in their pockets.

I just got back from the flying field, and yes, I had my heavy ceramic BATTERY BUNKER with me. I took it along since reading all the posts in here regarding Li-Po accidents made me re-think my battery transportation method.

Hauling that BUNKER out of the car (measures 12X10X8 inches) is a chore, but at least I won't burn the car to the ground in case "something" nasty happens.

That idea of a metal box with a plastic liner is great and I will be looking into it as well. It will be lighter and just as safe as the BUNKER!

qban_flyer
10-19-2005, 06:50 PM
Using Deans ultras will solve both of these problems. No exposed pins on the battery and impossible to plug into another battery.

Doug

I know, but for my lightweight planes the Ultras are too heavy. I don't like the JST connectors that much either. Too cheap looking, and they don't have quite the "right" feel to them.

Mike Parsons
10-21-2005, 05:07 PM
qban, I just (and I mean just as in 20 minutes ago) swapped all my JST connectors for deans Micro's. Just as light, but 15-17 amp capable if I recall.

http://imagescommerce.bcentral.com/merchantfiles/4695427/DeansMicro.jpg

-Mike

hoppy
10-21-2005, 06:13 PM
The Deans Micro Connectors have a recommended limit of 10A (info from the manufacturer). Some are using them above that value. YMMV

Mike Parsons
10-21-2005, 06:56 PM
Hoppy,
Thanks for posting the recommended limit from the man, as I couldnt remember. I tested them at 20a bursts and while they got a bit warm, they stayed together pretty well. I think that is the extreme of what I would take them. Most of my setups are 9-12 amps, but I have a couple that run 15a wot and they come down cool as a cucumber. Granted they are hanging out in the wind and not enclosed in a fuse. I think they underate them, but that is just based on my experience.
I have had JST's melt on me at 14 amps before.
-Mike

qban_flyer
10-21-2005, 07:11 PM
The Deans Micro Connectors have a recommended limit of 10A (info from the manufacturer). Some are using them above that value. YMMV

Interesting tidbit of information, though Great Planes has them installed in their C-7, C-12, BL-8, SS-8 AND SS-12 ESCs from the factory.

The C-12 and SS-12 are both rated @ 12A continuous, so perhaps Deans stiopulates 10A on their site as a "disclaimer" just in case someone goes above their true rated current capabilities.

The JST connectors, on the other hand, are rated for no more than 8A continuos and the metal inside them is rather thin, leading me to believe that 8A is really their maximum.

Dean Ultras are nice, but I won't add that extra weight to planes that would barely use 9A of current (statically measured) when I can achieve the same result with something one third the weight of the Plus connectors. Most of the motors I use them with do not draw 10A in flight, and that include canned as well as B/L types.

For any models of mine using Speed 400 types and larger motors (above 10 - 11A) I use Deans Ultra Plugs exclusively.

BTW, not being confrontational here, but I've just come off the Deans web site and found no specs on either type of connector. Thought it was an interesting fact that no specs are given.

http://www.wsdeans.com/products/plugs/micro_plug.html

qban_flyer
10-21-2005, 07:16 PM
Hoppy,
I think they underate them, but that is just based on my experience.
I have had JST's melt on me at 14 amps before.
-Mike

The ones I used @ around 10A did the same. So did the wire that comes with the pigtails.

All one has to do is compare the thickness and gauge of the connector pins and it becomes obvious that the Micros will stand 12 to 15A easily. Micros use a solid bar while the other uses a thin hollow tube. I don't think G/P would put them on 12A (15A burst) ESCs if they were not able to stand that much current draw.

BTW: No specs given at the deans site on either type, though I know the Ultras will handle as much as 40A continuous.

Mike Parsons
10-21-2005, 07:59 PM
The C-12 and SS-12 are both rated @ 12A continuous, so perhaps Deans stiopulates 10A on their site as a "disclaimer" just in case someone goes above their true rated current capabilities.
Good call. If you look at the SS-12 along with being 12 a continuous it has a 15a burst rating.
**edit** I need to read all the posts before replying :)

I couldnt find their ratings on the website either, but Hoppy and I travel in the same circles and has a bit of experience under his belt. I trust his quoted ratings are accurate.

Another interesting bit (and why I believe Deans underate their plugs) is the Ultra deans is rated at 70 amps. I am personally pushing these @ 90a without problems and I have friends who push them 120 amps without fail.

hoppy
10-21-2005, 11:49 PM
BTW, not being confrontational here, but I've just come off the Deans web site and found no specs on either type of connector. Thought it was an interesting fact that no specs are given.

http://www.wsdeans.com/products/plugs/micro_plug.html

That's true...that's why I called them on telephone..:) Myself, I use them for up to 15A burst applications and haven't had any heating problems yet.









i

qban_flyer
10-22-2005, 12:26 AM
Good call. If you look at the SS-12 along with being 12 a continuous it has a 15a burst rating.
**edit** I need to read all the posts before replying :)

I couldnt find their ratings on the website either, but Hoppy and I travel in the same circles and has a bit of experience under his belt. I trust his quoted ratings are accurate.

Another interesting bit (and why I believe Deans underate their plugs) is the Ultra deans is rated at 70 amps. I am personally pushing these @ 90a without problems and I have friends who push them 120 amps without fail.

Good to know and thanks for the tips Mike. I don't use them above 10 to 12 amps anyway so I don't have to fear frying them out as I did with JST. I am in the process of replacing all my JST connectors in over 16 smaller models, even the ones on my GWS tiger Moth (2 amp current draw WOT) will be history after tonight.

I have found the JST to have made an unreliable connection on six separate occasions, five on the ground and one while airborne. I can't trust them anymore as I don't like intermittent connections when using electrical equipement of any sort, regardless of cost.

qban_flyer
10-22-2005, 12:31 AM
That's true...that's why I called them on telephone..:) Myself, I use them for up to 15A burst applications and haven't had any heating problems yet.









i
Glad to know you went to the Dean's horse and got the info directly from its mouth. I wonder why aren't any specs published the on their site?

Thanks for letting us know!

hoppy
10-22-2005, 04:56 AM
They say they don't have "official current ratings".

qban_flyer
10-22-2005, 08:02 AM
They say they don't have "official current ratings".

That's very interesting, isn't it? :confused: :confused: :confused:

qban_flyer
10-22-2005, 08:13 AM
This is the way I have been charging my Li-Po packs since June of this year.

Got mine as a gift from a fellow modeler and good friend of mine, but they can be purchased from Suzie Goose Hobbies in Rockville, MD. It is a ceramic, fire proof container that I have chosen to call the "Li-Po Charging Safe".

Price for the type and size I have is $17 although they have other sizes, shapes and colors. They will also customize them to the customers wishes.

They are best contacted through e-mail Suzgoose@aol.com or by phone @ 301-279-2966, if by phone, ask for Roy Smith the proprietor, he is available weekdays from 10 am through 12:30 pm though I would suggest the e-mail route as being the surest way of getting in touch with him regarding this particular item.

Photos of mine attached below.

Vinman
10-22-2005, 02:39 PM
qban, That looks like it would be safe. But what about heat during charge. Doesen't the batt need to be in the open so it stays cool and don't over heat.

Unbalanced prop
10-22-2005, 04:59 PM
qban, That looks like it would be safe. But what about heat during charge. Doesen't the batt need to be in the open so it stays cool and don't over heat.

Lipolys should Never get hot or warm while charging. If they do something is wrong!!:confused:

Doug

hoppy
10-22-2005, 10:42 PM
Talking about hot lipo's and something being wrong, reminded me of the fireworks technician - on the back of his T-Shirt it said, "If You See Me Running, Try To Keep Up". (From a Readers Digest)

qban_flyer
10-22-2005, 11:55 PM
Talking about hot lipo's and something being wrong, reminded me of the fireworks technician - on the back of his T-Shirt it said, "If You See Me Running, Try To Keep Up". (From a Readers Digest)

HE, HE, HE. I would definitely keep that in mind.:D :D :D

When Li-Pos get warm to the point of risking getting damaged, they begin to "inflate" like a balloon ceasing to be flat packs. If you see that happening, run for your life after you dump two bucketfulls of sand on the offending pack(s).

qban_flyer
10-22-2005, 11:58 PM
qban, That looks like it would be safe. But what about heat during charge. Doesen't the batt need to be in the open so it stays cool and don't over heat.

In the time I have been using Li-Po packs (3 years) I have yet to feel one of them getting warmer than room temperature. Since the container is at room temperature, the pack will be just as safe inside the container as it would be outside.

Our safety is what the container will be protecting.

hoppy
10-29-2005, 09:15 PM
List updated

DickCorby
10-29-2005, 09:27 PM
I too have never had them get above room temperture with properly charge setup. The only over heating was if I go above 1C on the charger. I normally setup to charge at about 90-95% of the 1C rate.

On my latest creation (Ultra RC Fiberglass Scale Yak 54) I am drawing 65 AMPS static from a Dymond Modelsports 12C 4S-2P pack rated at 6000MAH. The motor and Batteries are just warm to the touch upon landing. Most likely because the entire flight is at about 1/2 to 3/4 throttle, except for a few seconds occasionally where I go vertical.

DickCorby
10-29-2005, 09:40 PM
Our safety is what the container will be protecting.

When I first started using Li-po's I used a container such as this. Really was afraid of them. Now I haven't used it in over a year, and have to charge some of my packs in the aircraft due to configuration. Some models are ruined if you try to set up a way to remove the batteries every time. The Yak 54 Fiberglass would ential removing the prop and cowl every time to get them out. And at the IMAC contests, those flying electrics do the same.

I really just make sure of the charger being set right, and I have had no signs of problems.

qban_flyer
10-30-2005, 04:26 AM
When I first started using Li-po's I used a container such as this. Really was afraid of them. Now I haven't used it in over a year, and have to charge some of my packs in the aircraft due to configuration. Some models are ruined if you try to set up a way to remove the batteries every time. The Yak 54 Fiberglass would ential removing the prop and cowl every time to get them out. And at the IMAC contests, those flying electrics do the same.

I really just make sure of the charger being set right, and I have had no signs of problems.

I used to charge my Li-Pos on a wooden bench in the basement. Been doing that for three years next month, without any problems. When we are careful, there is no reason for 'accidents' to happen. "Set it once and check it thrice", it's what my late grandfather used to say. He made his living re-winding electric motors of all sizes and types.

This container was given to me by a very good friend, so I use it regularly since it's available.

I know the pain it is removing and re-inserting battery packs in certain models, and the fact that some can get damaged in that process, especially when it is as involved as it is in your case.

BTW, that's a mighty fine looking YAK-54 you have there. Really nice!

hoppy
10-30-2005, 04:07 PM
Update

Heidelberg Germany Flyer
10-30-2005, 07:05 PM
List updated

Hi Hobby!

Thanks for updating your list. I published a copy of the original list for each member of my flying club. Got some interesting reactions (expressions of their faces), and noticed the members are more careful. At least we all have metal storage containers, now and we're not charging next to the car motor.

Appreciate all the work you did to publish, and update. Any chance you could use a different color when you update. Was your updated info just items 117 and 118?

HGF

hoppy
10-30-2005, 08:55 PM
Thank you HGF,
Yes, 117 and 118 were the updates.
hoppy

DickCorby
10-30-2005, 08:55 PM
One thing I do use is a fireproof container to transport and store the Li-Po's. It is a fireproof safe that I got at Fry's computer. In addition I always keep it in the front seat just in case. It would be a quick thing to pull over and throw it out the window if something should happen. I also have a fire extinguisher within easy reach at my workbench.

When my Quique Yak crashed, the batteries were really banged and misshapened, but cool. We kept them at hand, (I wanted to remove the connectors etc. back at the shop). and about an hour after the crash I picked them up and they had begun to warm up. Immediately cut off the wiring and doused them in Salt water, and they did their thing allowing them to be discarded the next day.

Note that it was about an hour after the crash that they began to warm up. So just because they are cool right after a crash, it doesn't mean they are not going to go up later.

DickCorby
10-30-2005, 08:59 PM
When Li-Pos get warm to the point of risking getting damaged, they begin to "inflate" like a balloon ceasing to be flat packs. If you see that happening, run for your life after you dump two bucketfulls of sand on the offending pack(s).

I think they are more like sausages, but same results.:p

qban_flyer
10-30-2005, 09:16 PM
I think they are more like sausages, but same results.:p

Something like two McDonalds apple pies stacked together, bottom to bottom.

Once the begin to 'inflate' that way it's time to get the sand bucket and cover them up!

DickCorby
10-30-2005, 11:33 PM
Something like two McDonalds apple pies stacked together, bottom to bottom.

Once the begin to 'inflate' that way it's time to get the sand bucket and cover them up!

The recommended action that I read was to get them immersed in water, and preferably salt water. I seldom have a bucket of sand near my workbench, but it is a short run to the bathroom sink and get them immersed.