Generic Smart Charger For Electric Drill?

My trusty Makita finally died.

BJ's had a Coleman battery-powered 21.6v with two batteries for
fifty bucks.

Seemed reasonable, so I grabbed it.

Got it home to find out that the charger isn't much of
anything... just a generic brick that puts out 24v.

Instruction manual cautions that leaving it on charge more than
"3-5 hours" will fry the battery. The light on the charger
doesn't even go out when the battery is charged.

Soooo... sounds like I either find a smarter charger, resign
myself to cooking the batteries eventually... or find an "egg
timer" type switch that I can crank to 3 hours and forget.

Anybody had any luck finding a generic charger for an electric
drill?

The form factor looks pretty conventional:
http://www.flickr.com/photos/48262653@N00/2113870826/
--
PeteCresswell
.

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