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My 2015 is still on the original battery. Tested it last winter with bimmercode it claimed the battery at any given time or temp to run anywhere from 63% to 98% battery life. i posted this question and found almost everyone stated to replace the battery. I am not one to just replace something for the sake of replacing I live in Central PA and the car sees winter conditions so far I have never had a slow crank or any symptom of the battery going bad. If it dose fail to start i always carry a high quality set of jumper cables in the trunk they have bailed many a driver out with a dead battery.
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