Also, be aware of different accessories that load the electrical system. Do not use functions which use a lot of power when the car is switched off. Examples of such functions are:
- ventilation fan
- windscreen wiper
- audio system (high volume).
If the starter battery voltage is low then the combined instrument panel's information display shows the text Low battery charge Power save mode. The energy-saving function then shuts down certain functions or reduces certain functions such as the ventilation fan and/or audio system.
In which case, charge the starter battery by starting the car and then running it for at least 15 minutes - starter battery charging is more effective during driving than running the engine at idling speed while stationary.