I just repaired one and It was hard to get it apart. The battery was a 3 cell and soldered on. 2 of the cells dropped below the cutoff voltage and the unit wouldn't charger I was able to get the unit apart just input to let the battery pack hang out. I cut the plastic off the battery and used a cheap charger to get each cell up to about 3v. The unit started taking a charge have I got the voltage up.
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