with out seeing the plug first hand its a little hard to say.
you maybe able to pop the pins out on the balance plug (like on servo plug)
and give them a small tighten with a pair of pliers
i dont balance my lipos (unless needed) and just keep a eye on the cells make sure they dont get to far out. most batteries these days are very good and stay with in .02-.03 of a volt.
if it only charges 1 cell whilst charging it wont hurt the pack,but when discharging it could and probably would discharge the low cell below 3 volts
destroying the pack.
hope that makes sense
