I do the rebuilt thing, too. When I had the shop I was an Interstate Battery dealer, became good friends with the driver who later opened his own company.... Good to have friends! He does all kinds of batteries, even rebuilds for the cordless tools and for a few $$$$ more will build a higher output version of them! After using the new series of batteries, doubt I'd ever bother with a lead-acid battery again.....The new stuff is a few more bucks, but worth it IMO.