I'm having a problem with my 2005 Scion xB. A 1-year old battery died on me in January, and the problem was diagnosed as the alternator overcharging the battery. I replaced both the alternator and the battery, but two months later, the new battery has died. The battery appears to get a normal current from the alternator at this point. I have replaced the battery, but I expect that this new one might die if I don't get a next opinion. The first garage was unable to diagnose the problem.