Some tool makers use different contact configurations, so that you can't
over volt a drill. 18 volts in a 12V drill is a bit too much. I wouldn't.

--

Christopher A. Young
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wrote in message
oups.com...
I've run a 14 volt drill with a 12 volt battery....has anyone
run an 12 volt dewalt drill with an 18 volt battery....I have
two 12 volt drills but would like to use the more powerful batteries.
Thanks

Paul