I don't expect anything to come of this suggestion, but I'll throw it out for fun. Why not offer a battery pack that can easily be serviced by the consumer? Something that can be opened with a couple screws and instead of using cells that are strung together by soldered metal strips, they are held in place and connected just as in a eight D cell application. The higher amp hour voltage specific either nicad or lithium cells could be tested, date stamped and marketed just like a battery pack or tool. The up side of this consumer friendly idea would be less time and cost dealing with a repair center and less pollution and waste dumping an otherwise good battery because of one or more defective cells. Just think about being able to open up your cordless battery and replacing a few cells, instead of the expense of buying another or the hassle of trying to get service? Maybe this has already been suggested?