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, turn off the key made of metal and use a flathead screwdriver to open the back cover. https://car-locksmith31264.ttblogs.com/9412555/what-s-the-reason-audi-a4-spare-key-is-everywhere-this-year