Our '02 Maxima has had repeated battery failure. Approximately every six months it is dead. I drove to the store yesterday and when I got back it was dead. We have it towed and the dealership says it is a bad battery cell. They also say they check the alternator and starter and they are good. We ran out of the factory warranty at the end of Mar. '05. It's gotta be something else. Although we are covered under the battery warranty this is just unacceptable. Does anyone have any ideas or experience with this?