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I had a similar issue on my 2012 520D @85k. Car didnt get load of usage but the odd long run here and there, got the discharge message almost every other day and replaced the battery as it was 9 years old.
Same issue but read somewhere the IBS cable on the battery terminal could be causing it so disconnected it and no issues since. Starts every time, no issues with lights/sluggy electrics.
My be worth a try!
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