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FMA Cellpro 4S -The Best LiPo Charger?

Old 03-28-2007, 08:45 PM
  #26  
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Old 03-28-2007, 10:30 PM
  #27  
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Originally Posted by JWilliams View Post
90% beep is purely for informational purposes. The charger has a built in thermometer and will automatically go into cold mode when it wants to and it will say specifically on the screen it's doing the cold weather balance, so if it wants to charge to 100%, let it!
The reason I didn't let it charge past 90% was because I was charging my batteries indoors where it is warm (where temp charge limiting would not kick in), but planning on taking them outside into the cold (like I said) to do my flying. And that is exactly the situation that they warn you about (in the Cellpro manual) to not charge over 90%.
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Old 03-29-2007, 01:24 AM
  #28  
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Originally Posted by herk_1 View Post
The reason I didn't let it charge past 90% was because I was charging my batteries indoors where it is warm (where temp charge limiting would not kick in), but planning on taking them outside into the cold (like I said) to do my flying. And that is exactly the situation that they warn you about (in the Cellpro manual) to not charge over 90%.
Ah, I guess it helps to read the manual. I did but don't remember that Thx!
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Old 03-29-2007, 04:28 AM
  #29  
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Old 03-29-2007, 12:05 PM
  #30  
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Originally Posted by Murocflyer View Post
I've noticed with mine. it doesn't say "balancing" until it's close to 100%. I believe I noticed it at 98 or 99%. I usually pulled them off at 95% until I saw that. But now I'm thinking I wasn't getting balanced batteries until it reached 100% so I let them charge to it's finished.

Not sure on that though since I haven't had the time to explore that theory.

Frank
I am 80% sure I read in the manual that you can take it off at any point in time and if you actually watch the voltages, they're almost always within .01 of each other, so it does continually balance...it won't pump one cell up to 4.2 if another is at 4, then stop the 4.2 and charge only the 4...it will never let the fast ones get very far away from the slow ones.
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Old 03-29-2007, 04:42 PM
  #31  
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Old 03-29-2007, 04:47 PM
  #32  
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Originally Posted by Murocflyer View Post
That's good to know. Next time I charge my batts, I'll keep an eye on it. But if anyone happens to charge theirs in the next day or two, please have a look and post the results.

Thanks,

Frank
The furthest I've ever noticed a diff on the 3 cell packs is a .02 difference, like 3.99 and 3.97, but only for a split second! Somehow and I don't know how, I have seen it drop voltages, like a cell might be 3.99 one second and then drop to 3.98. I don'tknow if cutting off current has a split-second voltage reversing effect on lipos, probably does since I don't think the charger ever actively discharges a cell.
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Old 03-29-2007, 04:50 PM
  #33  
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Old 04-02-2007, 03:56 AM
  #34  
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Lysander,
This is the kind of info I was looking for. The last time I asked this question on the forum I was told something like, "The charger is smarter than we are". Thanks for shedding some light on this. Your friend (who wrote it) is far too modest. I'd like to quote his words again since it was back on the other page;
The critical aspect of Lithium in respect to charge damage is due to the fact that the cell breakdown voltage of cells is only about 100mv higher than the fully charged voltage value . At room temperature the cell fully chrged voltage value is 4.2V. This fully charged voltage value goes down in temperature. If you charge a lithium cell @below 10degC temperature the chrge voltage needs to be about 4.1 volts not 4.2V. If you chrge at 4.2V at this temperature you can damage the cell due to overvoltage at the very least you will damage the cell and reduce lifetime.

If you charge the lithium cell to 4.2V (room temp) and then put the cell in the fridge and took its temperature down to 10C or less you have effectively overcharged the cell because 4.2 volts at this temperature is where cell damage is starting.


All lithium is shipped at 50% to 80% charge state because during transportation the temperatures can go very low in cargo holds or storage centres.
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Old 04-02-2007, 04:43 AM
  #35  
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Old 04-02-2007, 01:43 PM
  #36  
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Whenever I see a thread that says, "BEST", I cringe. Best would mean supreme above all others at any price anywhere.

Since I have not done an through review of all chargers I will just add my endorsement of this as a good choice for someone who wants a simple to use LIPO balancing charger that works as advertised.

Not suitable for packs above 3000 mah unless you want to wait a long time for the charge to complete. But other than that, good charger. I like mine!
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Old 04-02-2007, 02:25 PM
  #37  
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Originally Posted by AEAJR View Post
Not suitable for packs above 3000 mah unless you want to wait a long time for the charge to complete. But other than that, good charger. I like mine!
What charger do you rate as equal to the CellPro 4S but suitable for >3A packs? Most of my packs are 3300/3700mA and I confess that having bought and used a CellPro 4S, I was unaware of any issue when charging packs of more than 3A. Why is it so slow for them?
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Old 04-02-2007, 03:46 PM
  #38  
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Originally Posted by Lysander View Post
What charger do you rate as equal to the CellPro 4S but suitable for >3A packs? Most of my packs are 3300/3700mA and I confess that having bought and used a CellPro 4S, I was unaware of any issue when charging packs of more than 3A. Why is it so slow for them?
Because it can only charge at 3A rate. The instructions say it will charge for a maximum of 8 hours, so in theory can handle a 24,000 pack. The only drawback for you is time to charge.
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Old 04-02-2007, 06:18 PM
  #39  
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Originally Posted by Lysander View Post
What charger do you rate as equal to the CellPro 4S but suitable for >3A packs? Most of my packs are 3300/3700mA and I confess that having bought and used a CellPro 4S, I was unaware of any issue when charging packs of more than 3A. Why is it so slow for them?
It will work with packs of any size, up to 4S, it is just an issue of charge time. If longer than an hour is OK with you, then it is not an issue.

Higher rate chargers

Triton 2 - Up to 7 amps
http://www2.towerhobbies.com/cgi-bin...&I=LXMAJ0&P=ML

Combined with a balancer for balancing during or after the charge.
http://www2.towerhobbies.com/cgi-bin...?&I=LXMGS7&P=M


Balance Pro - Takes different balance plug then the cellpro 4S
but does up to 6S packs and 10 amps
http://www.fmadirect.com/category.htm?id=55
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Old 04-12-2007, 12:09 AM
  #40  
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On that FMA CellPro. That charges and balances your pack? What kind of plug do u have to have on you pack?Here is a pic of the plug I have will that one work ? thanks
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Old 04-12-2007, 12:25 AM
  #41  
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Originally Posted by Bombardier97 View Post
On that FMA CellPro. That charges and balances your pack? What kind of plug do u have to have on you pack?Here is a pic of the plug I have will that one work ? thanks
What pack is that? AFAIK, the charger natively handles FMA batteries, which aren't even buyable anymore, I think. So, FMA also sells adapters and if they don't have one that fits your battery, probedude at rcgroups.com (look him up there) sells a couple of adapters. I use polyquest packs and the polyquestion & thunderpro adapter that fma sells.

Yes, it charges as it balances and in fact will not charge a pack without a balancer.
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Old 04-12-2007, 01:12 AM
  #42  
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FMA is selling Lipo battery packs again!
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Old 04-12-2007, 01:23 AM
  #43  
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I have a thunder power 11.1 V 1320 Mah and I bought a nother pack off Commen sense rc 11.1 1650 Mah. Will that charger work ?
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Old 04-12-2007, 01:25 AM
  #44  
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They have adapters for most batteries you need to look on the website
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Old 04-12-2007, 03:06 AM
  #45  
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Old 04-15-2007, 05:08 AM
  #46  
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Originally Posted by Bombardier97 View Post
On that FMA CellPro. That charges and balances your pack? What kind of plug do u have to have on you pack?Here is a pic of the plug I have will that one work ? thanks
That's either a CommonSenseRC version1 pack or a DN pack. FMA's CommonSenseRC adapter will work for it, but I have no idea why they only support 2s and 3s with it.

Dave
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Old 04-16-2007, 04:44 PM
  #47  
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Thumbs down BalancePro HD 6s Charger for A123

Originally Posted by Murocflyer View Post
I haven't seen much discussion on the FMA Cellpro 4S charger by FMA. This has to be one of the easiest and safest plug and play chargers I have seen to date for up to 4 cells.

What do you folks think of it? Have you got one yet? If not, why not?

Comments welcomed.

Frank
How about the Balance Pro HD Charger for A123. Looks like it might be a better new charger than the cellpro 4S. Has anyone tried it out? Thanks
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Old 04-16-2007, 04:52 PM
  #48  
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Thumbs down Balance Pro HD Charger for A123

How about the Balance Pro HD Charger for A123. Looks like it might be a better new charger than the cellpro 4S. Has anyone tried it out? Thanks
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Old 04-16-2007, 04:55 PM
  #49  
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Originally Posted by [email protected] View Post
How about the Balance Pro HD Charger for A123. Looks like it might be a better new charger than the cellpro 4S. Has anyone tried it out? Thanks
Just an FYI, there is a promotion on the BalancePro right now, $20 off if you put in the coupon code SP41307 making it $89.95. This discount will at least pay for an adapter.

I suspect that a new balancepro with LCD is just around the corner. Back in January of this year Fred said that they were making the LCD version of the Balancepro their top priority.

Dave
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Old 04-16-2007, 05:36 PM
  #50  
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Thanks, I may wait on the LCD model. How about the differences in this charger and the 4S? Will one be any better except for the quanity of cells they will charge?
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