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Home made charger for a cordless. screwdriver.?How do i connect 2wire charger to 3 prongs on batt.

Blk & dec vpx 7 vdc cordless screwdriver.Missing charger,not available anymore.Batt. has 3 prongs for charger.

orksecurity7 years ago
Generally you don't have grounds on low-voltage connections... I would suspect that the third wire is for a monitoring circuit so you don't overcharge the battery. If so, this may be absolutely essential -- NiMH and Lithium batteries in particular can be Significantly Dangerous if you abuse them. Given how cheap these tools are, I'd get another and disassemble this one for parts, but...
fwjs287 years ago
The third is porlly for the ground...