How to Save Money on Audi Battery Replacement Does your Audi key fob have trouble locking and unlocking? This could indicate that the battery is in need of replacing. To replace the battery, you must open the key made of metal using an flathead and then open the back cover https://g2881892.ampblogs.com/5-reasons-audi-a4-spare-key-is-actually-a-good-thing-66668080