How to Save Money on Audi Battery Replacement Is your Audi key fob having difficulty locking and unlocking it? This could indicate that the battery is in need of replacing. To replace the battery, open the metal key using an flathead and then open the cover off using a screwdriver. https://autolocksmiths64294.blog5star.com/30254725/why-audi-a4-spare-key-is-relevant-2023