date code on your batteries and age
Picked up our brand new custom ordered TT last April. It has a single 12 volt Interstate battery which did not last a year due to a dead cell (confirmed by Interstate). Our dealer refused to replace...
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I had a similar situation with a NAPA battery. My local mechanic bought the battery from NAPA and kept it on his shelf (one of many he stocks). He installed it in my car. Napa tried to deny the warranty on two fronts. 1) date code showed it a LOT older than the time I had it in my vehicle and 2) I was not the original purchaser; the shop I took it to was the original purchaser. The shop had to fight for a long time to get the problem sorted out. I finally was reimbursed directly from NAPA corporate office for the new battery
