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I would like to get everyone's opinion on what to do to my 2015 I3 with Rex to maximize the life of the car. What's an idea of cost to replace the battery? I have 73,000 miles on the car and have done nothing except basic maintenance. With normal wear and tear (15,000 miles per yr) how long can I expect the battery to last on average? We love the car for around town use and want to keep it for a long time.