How to Save Money on Audi Battery Replacement Is your Audi key fob having difficulty locking and unlocking? This could indicate that the battery is in need of replacement. To replace the battery, open the metal key and use a screwdriver with a flat head to remove the back cover. https://g28-car-key-solutions49456.theisblog.com/30417474/8-tips-to-up-your-audi-a4-spare-key-game