Hi there,

I hvae a new FlightPower 11.1V 2100 mAh 25C LiPo battery. When I 1st received them, I tried running them on my plane but the ESC cut them off almost immediately. Then I charged them using a 3s balance charger that is rated at 0.8 Amps. After connecting them to the model, the ESC cut them off immediately for the 2nd time. I tried to charge other LiPo batteries on the same charger with the same results. So I tried charging them using a diferent balancing charger at 1.2 Amp then tried them on my plane for the 3rd time. The motor ran continously for 18 minutes on them but was weak (low Amp discharge) until the ESC interfered. Today a charged them using the same charger and then checked their voltage after charging, it was 8.36 Volts. You should also know that I have used an adapter to connect the battery to the charger and I connected it backwards for the 1st time and the charger did not start charging then I reversed the connection and the charger strted charging.

Are my LiPos damaged? If yes, is there any way to fix them? should I try different chargers?

Sorry for the long message and happy holidays.

The lipo's are probably OK - the ESC seemed to protect them from over discharge. But your charger may be faulty. They should read 12.6 v after a full balanced charge.

Asaad, at 0.8 amps your charger is essentially a trickle charger. Your 2100 mah pack can be charged at up to 2.1 amps. Using only 0.8 amps will take you approximately 2.5 to 3 times the normal charge time. To get a full charge at 0.8 amps would take close to three hours depending on efficiencies and losses.

Your ESC is hitting low voltage cut-off and protecting your undercharged LiPos.
Walt