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I had to deal with this kind of problems, a lot.
It could be a user error like leaving the car unlocked with some accessory running, you know, genuine power draw.
Or, it could be a problem with the car's battery management. I had a lot of issues with my 2013 (battery, battery charging module, ECU) and zero problems wuth my 2017. Even in the really cold weather I have not seen once the battery drain warning. So as I said, unless you did something to drain the battery, it's likely the car's fault.
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Current: 2017 330i xDrive M Sport
Past: 2013 328i xDrive, 2008 335XI 6MT, Legacy SPEC.B,
MazdaSpeed6(best of all)
Last edited by Bassthe1st; 01-07-2018 at 06:56 PM..
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