See also:

Sockets
The lighter socket can be used as a socket for electrical equipment while the engine is running or when the ignition is switched on. The total load of all sockets must not exceed 140 watt at 1 ...

Charging the battery
In the vehicle, only charge the battery via the terminals, in the engine compartment with the engine off. ...

Priority options
The driver has priority The source selected via iDrive in the front is output on the vehicle loudspeakers and can be selected but not operated from the rear. Other audio or video sources ...