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3700mAh LiPo dead?

Old 08-22-2010, 03:21 AM
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mike109
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Default 3700mAh LiPo dead?

G'day

I dragged out my electric glider today to fly it. It has not been flown since about March. The battery has been topped up a few times over the months

The battery is a 3700mAh 3 cell LiPo. I have only ever charged it with a small balancing charger.

Today I tried to fly the plane but the battery was behaving as if it were nearly flat but when I tried to charge it, the charger (Swallow) said it was over voltage and the balance charger said it was fully charged.

Ideas?

I suspect I need a new battery. Sad, because it has had very little use over the last 18 months or so.
Old 08-22-2010, 08:25 AM
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Default RE: 3700mAh LiPo dead?

My guess is a bad connection or resistance.

Voltage high when charge and voltage low when discharge is characteristic of very high resistance in the system somewhere.
Old 08-22-2010, 02:22 PM
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mdh1979
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Default RE: 3700mAh LiPo dead?

How did you store the lipo when not in use? Lipos should be stored at storage voltage (3.85 v per cell) and kept in a cool dry place. Storing a fully charged lipo or a discharged one will definitely cause it to have an early death.

Matt
Old 08-23-2010, 12:41 AM
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mehrshad
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Default RE: 3700mAh LiPo dead?

my guess is bad storage too!
Old 08-23-2010, 03:38 AM
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ma3bu
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Default RE: 3700mAh LiPo dead?

Before you get your new battery, how about repair lipo battery ?

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