All that happens when you cross the balancing leads is it blows the tracks off the little balancing PCB (the one with all the white sockets on) the tracks are very small and cant handle the current of reversed polarity.
All i have done is desoldered and moved the 2 cell socket (3 pin) to another point on that card (as all the sockets are in parallel) one where the tracks were not damaged.
All works fine again.
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