How to Save Money on Audi Battery Replacement Is your Audi key fob having trouble locking and unlocking? This could indicate that the battery is in need of replacing. To replace the battery, open the key made of metal using a flathead and pop the cover off using the screwdriver. https://g28carkeys59787.wizzardsblog.com/30105935/it-s-time-to-upgrade-your-audi-a4-spare-key-options