I have the same problem with a 2013 X3 with water pooling in the battery compartment and in the left tool compartment. I do not have a sunroof.
The water in the left tool compartment/ bucket appears to be dripping from the cover of the D pillar. I have no idea when the water is coming from in the battery compartment. I have ordered a tailgate rubber seal and hop that cures one of the leaks.
The BMW technical manual suggests checking the wire and grommet from the PDC sensors on the bumper where the cable enters the rear of the battery compartment. It may not be the same on then E83.
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