They will die even if plugged in and off. Ive done this. To recover them i have put them on a 0.1v Nimh charge and when they get to a voltage that will be recognised by your lipo charger balance them up. You obviously have to watch the batteries carefully for puffing/heat etc while on nimh charge. Depends on how low they have gone as to how good they will be after recovery. I have recovered a 2s from 4.7, and it seems to be holding charges and balancing fine.
Worked for me, but im not liable for anyone else trying it!
Alex
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