I have a 2015 Passat TDI - I had the dealer replace the battery 10 months ago. I brought it in for service and reported a weak cold start, the service rep called me back and said that the under warranty battery needs to be replaced . The kicker is not that the battery is bad but that they are refusing to cover the “bad” battery under warranty because the diagnostic tester registers that the battery is “good”. The tech says there is nothing wrong with the car and there are no drains or other issues and can not explain why the bad battery would test as good. It doesn’t seem right to have to pay another $280 for something that is still under warranty. Help!