How to Save Money on Audi Battery Replacement Is your Audi key fob not locking and unlocking it? This could be a sign that the battery is in need of replacement. To replace the battery, turn off the metal key and use a flathead screwdriver to remove the back cover. https://g28-car-keys28517.jiliblog.com/87126542/15-best-documentaries-on-audi-a4-spare-key