A lot of us use cordless tools in our shops. I have several sets of these but never was able to get good use from them. The batteries went belly-up very quickly. My DeWalt drill would give me no more than two screws worth of use before dying. My B&D tools haven't been used in years for the same reason. Finally I contacted Battery Outfitters of Golden, Missouri. https://batteryoutfitters.com (they have other locations also). The friendly guy I talked to told me a big cause of failure is that a tool and it's batteries sometimes sit in a wharehouse or on store shelves for a long time before being sold. Not using a battery causes early demise. Also, between uses a battery should be on the charge, not in the tool waiting to be used. Strange as this sounds, one might be better off with only one battery than two since one would sit not being charged and would go bad. I bought a new battery for the DeWalt and now have a working tool. I still have eight dead batteries that will go to the recycling center. A new batt for the B&D stuff is coming soon.