I would also wonder if there is such a thing as any information showing a "rebuilt" battery's energy consumption to recharge to level where it will be of 80% charge after 4 hours operation to be any different than a "checked as good but used" battery's energy consumption to acquire the same level of charge/useful operational hours. I think if I saw such figures and knew them to be testable and accurate, I might conclude there was some value in what Mike1234 had to offer.