Just had my 2014 X5 3.5 serviced and they replaced the main battery. Dealer said it was normal maintenance and would be replaced every 2nd oil change. Car only has 14k miles on it and no battery issues. This sounds absurd to me. I guess I wont keep car once its off warranty. Anyone else have this issue?

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2014 M5
2013 M6 Convert.
2008 X5 4.8
2006 750li