Ever had a “dead” power tool battery that wouldn’t charge? It may not have been dead-dead. Some chargers have a safety feature that prevents trying to charge a battery completely out of juice. I was able to bring a Craftsman power tool battery back from the dead using a trick I found in the comments on a YouTube video. Sometimes it pays to read the comments.
This battery was part of a used Craftsman cordless tool set I practically stole. The set was a battery charger, small circular saw, reciprocating saw, nice case for those 3, drill/driver, nailer/stapler, and 2 batteries. Everything is in excellent condition and I only paid $30! The original sticker price on the box for the nailer alone was $80.