While you wait for answers, we may have found some information which could help you.
Click here for Black Check AppearsBlack and Decker drill 18v li-ion battery not charging?
Black & Decker 12V battery pack fails to charge?
KC1882F Black and Decker drill: what polarity are the battery connections?
12v black decker a9275 replacement charger and battery?
carbon brushes replacement Black & decker BD163V?
how to change to power cord on my black & decker H 552 400 Watt 10mm(3/8") ?