Can anyone tell me why the Rigid Mod. R82008 Lit.-Ion 12V Batteries go dead almost instantly after starting drill. Recharging Batts. time again, same thing happens, batts go dead in less than 30 seconds. Went back to Home Depot, exchanged for another Rigid Mod R82008, exact same thing. Battieries go dead almost instantly. Like the drill, (when it's working). Any suggestions as to why this is happening?