Watch useing dewalt charger and batt. I had a dewalt 14v now for 7 years or so. And bought a second one cause how good they are two years ago. Anyhow they have a IC int eh batt that tells charger if its too hot, if its charging right, if its got bad cell. You name it. This wont like a dumb batt. from a firestorm less they too have IC integrated but I doubt it. Oh by the way Dewalt is Black and Decker just their high end sold under diff name.