Often with the nimh batteries the chemicals will corrode the bms board.
some repairs can be made but they start to conduct internally along the vias inside then pcb.. and eventaully fail,...so even with new cells it won't work.
I have new boards just waiting to be built and tested...as I use nickel cells alot I don't want to be without.
However, it is often just the cells that are unservicable..
best...
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