[sengli]

Had the same issue with my brand new 1LE last year. The car was always kept on a battery tender when not in use normally. I started driving it more often. So one week I didnt plug it in. And the next day it was dead. Had to jump it, to get the trunk open to attach a charger. Took it to the dealer and they tested the battery which was fine according to them. They had it for three days. Got it back and the charging voltage on the floor gauges was pegged at 15v+ all the time. Plus when attached to my tender it charged almost constantly. Finally made the dealer replace the battery, plus they also found the BCM ( body control module) software was not up to date too. After that it was back to normal.