See also:

Configuring the prewarning
After the warning function is switched on, the following can be set via the iDrive: The prewarning can be switched on/off. The time of the prewarning can be set. These settings have no effe ...

Activation/deactivation
Press the button. ...

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