There is an alternator fault or a fault in the vehicle's electrical system.

Drive to a qualified workshop without delay. Avoid using electrical equipment that is not absolutely necessary (such as the radio) because this will drain the battery. If the battery charge is insufficient, obtain professional assistance.

Starting reliability may be impaired.

If this message disappears after a while, the battery will have been sufficiently charged while driving.

If the message does not disappear again, drive to a qualified workshop without delay and have the fault rectified.