Battery in luggage compartment under spare wheel
WARNING: This page does not describe the selected car, but rather 21 other vehicles, including the 2015 BMW Alpina B7L, 2015 BMW Alpina B7, 2015 BMW 750i, 2015 BMW 750Li, and 2014 BMW Alpina B7L. 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.