Battery in luggage compartment under spare wheel
WARNING: This page is about a different car, the 2011 BMW 750xi, 2011 BMW 750Lxi, 2010 BMW 750xi, and 2010 BMW 750Lxi. However, it is still accessible from the selected car via links, so may be relevant.
Remove spare wheel.
Release screws.
CAUTION:
Do not kink air pipes.
Set air supply system (1) to one side.
Follow instructions for disconnecting and connecting battery.
Disconnect battery negative lead.
Disconnect supply cable (1) for vehicle electrical system.