I don't actually have much experience with these batteries to determine life but I was very pleased to find thses so i can contninue using all those black and decker tools that had become oblolete for lack of finding replacement batteries. And, they are NiMH which I hope will be better than the old NiCads. Not a bad price either and the quality appears to be quite good. I didn't have a problem inserting these into the tools as some have reported.
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