While you wait for answers, we may have found some information which could help you.
Click here for Decker Drill Chuckcarbon brushes replacement Black & decker BD163V?
how do I remove the chuck head ?
Repair Cordless Drill Battery?
12v?
KC1882F Black and Decker drill: what polarity are the battery connections?
Black and Decker drill 18v li-ion battery not charging?