Excessive battery sag on 30q 18650 li ion cells

ArduCopter Copter 4.3
21

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22

I got them from the 18650 battery store

23

I think i found the issue, one of the cells was arcing to the BMS and draining very quickly, I isolated it with kapton tape and it flies a little longer now before it falls out of the sky for a different reason, the volts dont sag below 22 now, i think the motors are overheating or something.

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