This client's recently purchased 2015 F80 M3 had a "replace battery" warning on the dash, a potentially very unpleasant thing to fix, as the F80 M3 uses a lithium ion battery that is around $2000 to replace.
The car started fine and apart from the warning nothing was wrong, after scanning it, a code for internal battery failure was found, apparently only clearable by replacing the battery. As the battery seemed to be fully functional we decided to run the battery replacement routine without changing anything, this removed the warning and code.
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