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In my 2012 X6M (build date 4/2011), I got the same message last year and this year, both when the weather turned colder. It was generally coupled with the comfort access not working to open the doors. Last year, the dealer charged the battery and it seemed to work. This year, the dealer replaced the battery and battery cable entirely, blaming the problem on the battery cable. I mentioned the slow/fast charging scheme to the dealer, who said their tech had never heard of it. I've certainly seen the scheme mentioned enough times on this forum to know that it exists! Good luck.
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