Unbalanced lipo wont charge

So today i go to charge my 4S and im get cell voltage low. Sure enough 1 cell is about 1v lower then the other and i have no idea how or why.I went for a flight, then at home use the lipo to power my apm to do some changes via usb.Any ideas how i can rebalance the cells and save this battery, im broke right now and cant afford anotherThanks

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  • The cell is below 3volts, it's bad anyway.
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