Instruction book AUDI A4
 Audi A4   Controls   Instruments and warning/indicator lamps  Warning and indicator lamps
Alternator fault: Battery is not being charged
If the warning lamp lights up and the message appears, there is an alternator fault or a fault in the Audi A4's electrical system.
Drive to a qualified workshop without delay. However, you should avoid using electrical equipment that is not absolutely necessary because this will drain the battery. If the battery charge is insufficient, obtain professional assistance.
Low battery charge: Battery will be charged while driving
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.

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