This seems to be a good product, but with aftermarket batteries only time will tell as they say. These do fit a little tight in my chargers but although a little annoying, I can live with. They don't seem quite as powerful as the originals, but still last plenty long before running down. Considering that these are about 1/4 the cost of new Dewalt batteries and about 1/3 the cost to have my originals rebuilt, these are a screaming deal even if they only last a couple of years ! I would purchase them again and again. Plus two gives me plenty of run time and since my original is my third, I can keep them rotated in the charger for all day work.