One has to assume the main battery connection goes to the CPU electronics, including the output side of the main 12v charging system. One of the secondary connections could well be the battery-state indicator circuit, the other the infotainment system?
Just guessing of course.
High performance BMW's have a pyro fuse on the live terminal on the 12 volt battery, but these tend to be high spec lithium units and not your standard run of the mill 12 volt batteries.
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