Reducing the energy consumption of the key
All vehicles: if you do not use the vehicle or a key for an extended period of time, you can reduce the energy consumption of the respective key. To do so, deactivate the key functions.
To deactivate:
press the 
button on the key twice in rapid succession. The battery check lamp of the key flashes twice briefly and lights up once.
To activate:
press any button on the key. When the vehicle is started with the key in the stowage compartment of the centre console, the key functions are automatically activated More.