Had the car at the dealer since Thurs for the "High Battery Drain" issue. The service manager personally checked it out, ran all the diags in SIBs. The result:

Replaced Battery 61-21-7-594-976 (made in Italy)
Replaced Battery Cable 61-12-9-215-954
Replaced Battery Cable 61-12-9-217-004
Replaced IBS and BST (no part nrs, one is Intelligent Battery System, no idea what the other is).

Negative battery terminal cracked causing corrosion on IBS.

No idea how the battery cracked. It's held down tight and to be honest, I've been remiss and have never even looked at it since it's out of sight. Hopefully this will be the fix. I'll post if the warning returns.

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E70 X5 3.0si Space Grey

E36 Z3 2.5i Roadster, Sterling Gray Metallic