These seem to be good replacements for the Black and Decker batteries. They seem to have adequate power, but I have not used them for more than driving screws and running a hedge clipper to fine trim holly bushes. I have no reason to think that they will not provide the power needed for any tool that they fit, but I have not worked them hard.
The fit of the batteries is a little snug. The required more fore to seat than the original batteries. Both batteries mounted and released but were a little stiff.
I have not used these batteries for heavy tasks, so I don't know how long a charge will last. I am cautiously optimistic. If I need more B%26D batteries, I will buy these again.