I agree with those that think the problem is due to using a non-sine
wave inverter. I've recently seen low power true sine wave inverters
advertised for a reasonable price, I think it might have been in the
Norther tool catalog. In any case, I suspect the inverter may still
cost more than a new drill as one writer said. If there is a valid use
for the sine wave inverter other than charging the drill, that may be an
option.

Jim.
OMOO wrote:

A friend bought a 19.2 v Sears cordless drill for use on his boat.
He's cruising now in Aust so no 110 VAC wall power. The charger won't
charge the 19.2 VDC battery on either his inverter or his Honda
generator. Sears doesn't have a 12VDC charger so now what.

Any ideas why and how to fix this ? Any possibility of a generic
charger that runs on 12 VDC? I don't know what the 110 VAC charger
puts out - maybe 25 V ??