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Old 05-25-2012, 11:56 PM   #1
JimH Ca
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Default Battery charging question

I charged two 2100 mAh, 2S, PowerWing Lipo batteries I received this week from Hobby Lobby and while the first one did just fine, the second one finished charging in about 7 minutes and it only shows a charge of 13mAh. I used a new Onyx charger set to charge a Lipo, 2S, 2100mAh battery and like I said I had no problems with the first battery at all. Could the charger not be reading the battery data properly? is there some way to discharge the battery and reset it's memory? I'm not sure why the second one is not charging properly.

Thanks, Jim
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Old 05-26-2012, 12:48 AM   #2
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There is no memory for lipo packs. What is the packs voltage? It should have arrived with a storage charge but maybe it was already charged. It could be a bad pack as well.

Mike

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Old 05-26-2012, 12:49 AM   #3
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One thing I have done as well make sure the charger was still set to lipo's and not A123 batteries.

Mike

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Old 05-26-2012, 02:41 AM   #4
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The charger is still set for the proper Lipo battery and I'm showing about 8 volts on my little multimeter. When I try to charge the battery the charger runs a few seconds and then indicates the charge is complete but only shows it has 13mAh and not the 2100mAh indicated on the battery pack. The first battery charged for about 65 minutes and was indicating about 2245mAh when the charger shut off. The readout on the charger is showing 12.41 V input, 8.33 V output, 0.00 V peak on both batteries. I guess it's possible that the battery in question did come fully charged. I don't understand why it only shows 13 mAh upon completion of the charge cycle though.
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Old 05-26-2012, 02:49 AM   #5
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Try this if you have the ability to discharge with the charger. Discharge the battery to 3.7 volts per cell then recharge and see how much it takes. If memory serves me correctly it should take about 1100 mAh.

Mike

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Old 05-26-2012, 02:52 AM   #6
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Originally Posted by Sir Crash-A-Lot View Post
Try this if you have the ability to discharge with the charger. Discharge the battery to 3.7 volts per cell then recharge and see how much it takes. If memory serves me correctly it should take about 1100 mAh.

Mike
I'm not sure I have the capability of discharging on my charger but I will look into it ...
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Old 05-26-2012, 04:19 AM   #7
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Originally Posted by JimH Ca View Post
The charger is still set for the proper Lipo battery and I'm showing about 8 volts on my little multimeter. When I try to charge the battery the charger runs a few seconds and then indicates the charge is complete but only shows it has 13mAh and not the 2100mAh indicated on the battery pack. The first battery charged for about 65 minutes and was indicating about 2245mAh when the charger shut off. The readout on the charger is showing 12.41 V input, 8.33 V output, 0.00 V peak on both batteries. I guess it's possible that the battery in question did come fully charged. I don't understand why it only shows 13 mAh upon completion of the charge cycle though.
I think the 13 mAh you're seeing is telling you what the charger put in. I don't think any charger tells you how many mAh are currently in the battery. Makes sense, since it only charges a little and stops. You either need to get a battery checker, or go by the voltage. 8.33v on a 2 cell sounds full to me.
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Old 05-26-2012, 04:37 AM   #8
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It depends on how much the individual batteries needed to be charged. What are the voltages of each pack? Are they similar? I can't explain it, but I have bought several new batteries that did something odd on the first charge (Most likely out of balance from the start come to think of it, requiring more "Charge Time"). I also have an Onyx charger (245 Dual Charger), The MAH meter is showing what the charger put into the battery, not it's capacity. You should only be discharging the battery enough to have to put 80% of it's capacity back in (I think that is the general rule % wise)
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Old 05-28-2012, 05:23 PM   #9
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Yeah I'm thinking now that there isn't anything really wrong with it. Just a rookie mistake on my part. Everything checks out fine so I will wait and see how it performs. Thanks guys for all the input...

Jim
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