Hi Paul,

Welcome!

Which direction are you trying to achieve? AC -> DC or the other way around? You might find some useful ideas in these two entries:

http://www.homemadetools.net/cordles...tery-adaptor-2
Homemade Cordless to Corded Drill Modification

Be sure to post some pics of the conversion project once you get underway; we'd love to follow along!

Ken