Id prefer to find someone to rebuild the ion lithium if I could. Ive googled trying to find someone to rebuild but noone does. If not Ill probably look on ebay. I think Im ganna take apart the fried battery and see if its the cells or the board. If its the cells i can probably replace them from what ive read. its the boards that screw you. If its that looks like im going to either wait till all three are kicked and buy new ones or maybe switch to nicd a lil cheaper but I guess the Li Ion run longer. Being the circuit board possibility do the boards come out of the case? Could these be sent to a cicutry repair shop to be fixed? Is the a grinder that accepts these batteries? Either the NiCd or Li Ion v18 style