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Old 05-17-2012, 04:53 AM   #1
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Default Anyone looking for a lipo storage device that shuts down automatically?

ive com up with a circuit that will make storing of lipos a breeze. I would have printed circuit boards built if there were a market for them. mine discharges 4 lipos at a time. selectable voltage and very accurate. It shuts itself down by itself safely and accurately.
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Old 05-17-2012, 07:14 AM   #2
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So what's the difference between this and any normal charger that turns off the charge when it reached the target voltage?
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Old 05-17-2012, 03:49 PM   #3
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its portable, its fast. you do not plug this into a ac outlet.
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Old 05-17-2012, 03:57 PM   #4
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I want one.....if the price is right.

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Old 05-17-2012, 06:33 PM   #5
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What is the discharge rate?
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Old 05-17-2012, 07:02 PM   #6
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Default lipo storage

Sounds interesting, I would like one.
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Old 05-17-2012, 07:41 PM   #7
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I'd be interested in seeing a few details of the unit, maybe a video of the prototype in action? Presumably it has some serious cooling built in (heatsinks, fans etc) because if you are discharging multiple LiPo's at high rates then you are generating A LOT of heat.. the energy has to go somewhere.

'Normal' chargers are of course portable and don't need to be plugged into AC. They usually work of a DC source, which for discharging for storage could just be a small battery. Quite important.. does it balance when it discharges?

Hard to say if your unit offers any advantage without seeing the details.

Steve
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Old 05-17-2012, 09:20 PM   #8
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Ill take a video of the prototype. It has a thermal circuit that turns on the fan. It also has a heatsink. It discharges at 3 amps. the circuit is ran by the battery being discharged not a auto battery. totally portable. I was actually thinking in terms of selling the board , power resistors and letting the owner buying his or her own project boxs to keep the cost down. The buyer could buy boards pertaining to there needs as far as voltage and then put them into their project box. If they wanted to buy the thermal circuit, that would be available also. Only need 1 of those. Im thinking of a dollar amount of $30.00 for the thermal board. Take a look at the video Saturday of the prototype. George.
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Old 05-17-2012, 09:39 PM   #9
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That'll get a batt down to storage voltage while under the 3 amp load, how much will a cell rebound when that load is removed?

I've thought about adding a current-sensing relay to my AC6 charger and powering the AC6 with the battery being discharged down to storage voltage, where the relay would cut power (and maybe cut connections between the batt and charger) when the discharge current stopped.

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Old 05-17-2012, 09:52 PM   #10
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after discharging ive set mine to rebound back to 3.83 volts per cell. they rebound approximently .125 volts on a 3 cell pack. Before I go flying ive decided to download some pics for now.


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Old 05-17-2012, 11:30 PM   #11
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Nice work. This is an impressive piece of electrical engineering for sure. IMHO it would appeal most to those who don't already have a charger that does storage charging/discharging.

Personally I already storage charge/discharge covered with my icharger that is if anything more portable and can discharge at up to 80W (over 6A on a 3s pack) and will balance discharge too.
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Old 05-18-2012, 02:13 AM   #12
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Originally Posted by JetPlaneFlyer View Post
Nice work. This is an impressive piece of electrical engineering for sure. IMHO it would appeal most to those who don't already have a charger that does storage charging/discharging.

Personally I already storage charge/discharge covered with my icharger that is if anything more portable and can discharge at up to 80W (over 6A on a 3s pack) and will balance discharge too.
Yup
The newer LiPo chargers, such as my Cellpro Powerlab 8 charger has this feature built in. (I've never used it though, since this discharge to a storage voltage is not required for those A123 cells.)

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Old 05-18-2012, 03:45 AM   #13
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I'm a newbie so this prompts me to ask--I'm trying to fly at least a couple times a week. Don't have many batteries yet but they're accumulating. How long a does a battery need to sit before I need to consider doing storage charging and so on?

I have an iMax B6, a wattmeter and another Chinese gadjet that tells me it will check voltage, balance cells and discharge the battery. Is cell discharging something that should be done on a regular basis even if you're flying on a regularly?
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Old 05-18-2012, 04:28 AM   #14
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Originally Posted by Beemerider View Post
I'm a newbie so this prompts me to ask--I'm trying to fly at least a couple times a week. Don't have many batteries yet but they're accumulating. How long a does a battery need to sit before I need to consider doing storage charging and so on?
Anything more than a day or two should be put into a storage charge.

Mike

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Old 05-18-2012, 05:24 AM   #15
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Not to be disrespectful, I disagree with you Sir Crash-A Lot. I keep my batteries fully charged at all times during flying season and have found no difference in the performance or life of my Lipos as when Inalways stored them at storage charge. I keep all my Lipos in a sealed. 30 Caxliber Ammo Can. This is what I transport my batteries in. When I get home I set the entire ammo can inside a .50 Calber Ammo Can. I keep the. 50 Ammo can in aspare bathroom at a constant temp of 72 - 75 degrees. I believe storing batteries in a too hot or too cold environment is more harmfully to the batteries than the state of charge. Now if you are not gonna use them for a month or so, by all means bring them to storage charge. NEVER STORE YOU LIPOS INSIDE, IF THEY ARE NOT IN A SEALED FIREPROOF CONTAINER.
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Old 05-18-2012, 05:44 AM   #16
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That is fine you can disagree and to some extent what I posted is wrong anyway. Batteries over 30c will puff if left fully charged all the time so why not just put all batteries on a storage charge so you don't get confused. I can tell you for a fact the only thing I did to 4 65c batteries last year is is leave them fully charge all the time like I always have before. EVERY ONE OF THEM PUFFED IN 1 MONTH but I continued to use them. These were not low end batteries either so I wasted about $700 worth of batteries. For the record it was 2 5000 6-cell and 2 6800 6-cell packs that were destroyed in less than 6 months time. I have now had 4 Gens Ace 5300 6-cell batteries for coming up on a year that I do not charge until the day before I go out and they are good as new yet. I know other people who use the other batteries and put them on a storage charge and they did not puff for them either.

Contact Empire RC and they will tell exactly what I just said.

Mike

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Old 05-18-2012, 05:46 AM   #17
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Originally Posted by Big Johnny View Post
When I get home I set the entire ammo can inside a .50 Calber Ammo Can.
So you don't store them charged either? You never say you charge them before putting them in the ammo can.

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Old 05-18-2012, 05:53 AM   #18
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From Empire RC

Storage - Lipo should never be stored fully charged, or with less than 50% of capacity remaining. We strongly recommend Hyperion EOS chargers, as they have automatic STORE functions to insure that the packs are in the range of about 60%~70% capacity (3.78V~3.92V resting voltage per cell). After returning home for the day, simply use STORE MODE to achieve this automatically. Batteries are best stored in a cool, dry environment (2~20 C or 37~68 F).

From XPS

WARNING!! LIPO BATTERIES CAN NOT BE STORED IN A CHARGED STATE FOR MORE THAN A FEW HOURS OR THEY WILL BEGIN TO SWELL. STORE ALL LIPOS AT NO MORE THAN 3.75v PER CELL.

From Thunderpower

Storage & Transportation
1) Store batteries at room temperature between 40 and 7 0 degrees F for best results.
2) If storing longer than one week; batteries must be stored at 3.8V/cell to 3.9V/cell (approximately 50% charged) . This is easily accomplished using the Thunder Power 1010C charger.

Mike

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Old 05-18-2012, 06:03 AM   #19
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Originally Posted by lvjet View Post
after discharging ive set mine to rebound back to 3.83 volts per cell. they rebound approximently .125 volts on a 3 cell pack. Before I go flying ive decided to download some pics for now.


+1 on very nice work.......very cool.

cr
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Old 05-18-2012, 02:22 PM   #20
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I have several Thunder Power G6 45C 6S batteries that have not even shown a sign of puffing while being stored for over 2 weeks fully charged. Yes I charge my batteries before I put them in the Ammo Can. The only battery I have ever had puff was a Common Sense RC 1500. I also don't abuse my batteries. If I need a battery that puts out 50 amps I use one capable of 75 amps.
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Old 05-18-2012, 02:26 PM   #21
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Originally Posted by Sir Crash-A-Lot View Post
From Empire RC

We strongly recommend Hyperion EOS chargers, as they have automatic STORE functions ...
I have a Hyprion EOS 0606i charger but I can't find storage function on the menu. There is charge and discharge but discharge goes automatically down to 3V so you have to watch the voltage for storage. The same is with charging - you have to watch the voltage. Maybe newer versions of Hyperion charges have auto storage. Or am I wrong (I'd like to be ... ).
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Old 05-18-2012, 03:41 PM   #22
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Originally Posted by Big Johnny View Post
I have several Thunder Power G6 45C 6S batteries that have not even shown a sign of puffing while being stored for over 2 weeks fully charged. Yes I charge my batteries before I put them in the Ammo Can. The only battery I have ever had puff was a Common Sense RC 1500.
They dont always physically 'puff' but storing fully charged does damage the battery and over time seriously impacts on performance. If you dont use your batteries hard (like near their c rating) than you may not notice until until the damage gets really bad, but that doesnt mean you are not damaging them. If you have a charger that can measure internal resistance you would probably be able to measure the damage.

It's not just me that's saying this. Every single LiPo manufacturer including the manufacturer of your actual batteries specifically warns against storing fully charged for extended periods.... But what do they know

Steve
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Old 05-18-2012, 04:03 PM   #23
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Originally Posted by vonveska View Post
I have a Hyprion EOS 0606i charger but I can't find storage function on the menu. There is charge and discharge but discharge goes automatically down to 3V so you have to watch the voltage for storage. The same is with charging - you have to watch the voltage. Maybe newer versions of Hyperion charges have auto storage. Or am I wrong (I'd like to be ... ).
Page 6

http://media.hyperion.hk/dn/eos/EOS0...)-B-MAN-EN.pdf

Mike

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Old 05-18-2012, 04:05 PM   #24
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On Lipos , do not leave a fully charged battery for longer than a week. the voltage needs to float. Ive gone longer to about 2 weeks max at times. no puffing but not a very good practice. All my batteries are over 3 years old now and still work well. I know its a pain in the A!! but saves you money in the long run. I run electric ducted fans . 6S batts . My lipo charger storage mode discharges at .100 Mah. It takes 60 hrs for my 6000 mah batts to come down to a storage voltage. Terrible!!!!. That is why I built my own storage unit. On top of that, Now my charger is open for the charging of other batteries.
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Old 05-18-2012, 04:09 PM   #25
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I am with Steve - I have had higher C rating packs stored fully charged that died FAR too early.

Since I have been vigilant about charging right before flight or at the field (parallel charging rocks!) my packs are lasting noticeably longe, 2-3times in fact.

I think the distributors do know best here.

Store at 3.7/8 per cell and they live longer. I am convinced.

What I also know is NONE of my higher C packs are living as long as my 6c-10c packs. I just retired a 6c eTech and a 10c TP pack. Both were over 8 years old. I still use an old 8+ Tanic pack in a 6v LED lantern and it continues to put out at low levels and charges to about 70% capacity. I have close to 500 cycles on those packs!

I feel good when my High C stuff gets through two seasons and 100-150 cycles.

Mike
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