have had similar happen with packs, i keep a cheap 1 cell charger especially for out of balance recovery. the centre contact may be the live or neutral depending which cell you are charging, if it is the neutral side that is low then the centre will be the live......
the charger i use is set to 500ma and charges via the balance plug. get a 2mm plug and a 4mm socket and make an adaptor lead up otherwise.....
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