it's odd that you only left plugged in overnight I have left stuff plugged in for weeks carelessly with no problems
is this a two cell stick pack ? it is possible connecting wire inside pack is dislodged but that's rare
you could try charging bad cell on a nimh setting see if it recovers but you must watch carefully and swop to lipo setting once voltage gets to approximately 2.8 v
again this is not successful that often
cheers Dave
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