See also:

Vehicle battery
Maintenance The battery is maintenance-free, i.e., the electrolyte will last for the life of the battery. Your service center will be glad to advise you on questions regarding the battery. Batt ...

Storing
Storing 1. Switch on the radio ready state or the ignition 2. Set the desired seat, exterior mirror and steering wheel positions. 3. Press the button. The LED in the button lights up. 4. ...

Safety
Both the coupe and convertible have front airbags plus side-impact airbags built into the front seats. As required of all 2012 models sold in the U.S., the 640i has standard antilock brakes and an ...