So a few weeks ago I had three hard starts and my car died. My battery was only 18 months old. Jumped the car, took it to the dealership and they said the battery tested fine. That lasted three days. The car died again after three hard starts. Jumped it and dropped it off at the dealer. They tested the battery again and said it was a bad cell, replaced the battery. Started it the first time at the dealership and it was a very rough start. It lost power when driving back to work. This time had it towed to the dealership since I didn't feel safe to drive it. They did an update that included loss of power and it seems to be starting fine. It's been two weeks and the battery says its running 13.2-13.6 volts and seems to be decreasing. I'm at a loss of what to do. Any ideas are appreciated.