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Batteries & Chargers Discuss Li-P, Li-Ion, NiMh, Nicad battery technology and the chargers that juice 'em up!

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Old 03-16-2012, 10:39 PM   #1
paxskipper
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Question LiPo Charge Level Seems To Go Up

I am flying an Apprentice 15E using 3S LiPo batteries. I always check the charge level following each flight to be sure I do not run them down to low. My goal is to not be less than 30% at the end of the flight.
Well it seems that if I wait a few hours to charge them that the % charge at that time I go to charge them is higher than when I took them from the plane
I'll do a more systematic logging of charge level in the future, but at the moment it does seem that the charge level goes up after waiting a few hours.
BTW the batteries are never even warm when I land.
Thanks in advance for your responses
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Old 03-16-2012, 10:46 PM   #2
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Battery voltages (which I guess is what you are actually measuring) do always recover somewhat after a flight i.e. when the load is off. If you measure immediately after landing and then after about 10-15 minutes it will have increased. But I'd be surprised if it goes up much after those first few minutes.

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Old 03-16-2012, 10:53 PM   #3
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Voltage recovery after load is removed from any rechargeable battery is normal. There is an immediate bounce, then a gradual and slowing increase over some time period. That does not indicate capacity improvement. Voltage is a VERY crude indicator of remaining capacity. For NiXX it is almost worthless.

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Old 03-17-2012, 12:43 AM   #4
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Originally Posted by flydiver View Post
Voltage is a VERY crude indicator of remaining capacity. For NiXX it is almost worthless.
Same for those A123 cells. Their voltage from 80% to 20% charge varies by only a few percent.

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