Battery in luggage compartment behind side trim panel
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 side trim panel.
Follow instructions for disconnecting and connecting battery.
Disconnect and cover battery negative lead.
Release front side trim panel partly and fold forward.