How to Save Money on Audi Battery Replacement Is your Audi key fob having difficulty locking and unlocking? This could be a sign that the battery needs to be replaced. To replace the battery, turn off the metal key and use a flathead screwdriver to pop up the back cover. https://autolocksmiths33772.uzblog.net/are-audi-a4-spare-key-as-important-as-everyone-says-44283958