How to Save Money on Audi Battery Replacement Is your Audi key fob having difficulty locking and unlocking? This could indicate that the battery needs to be replaced. To replace the battery, turn off the metal key and use a screwdriver with a flat head to open the back cover. https://g28carkeys39791.isblog.net/15-great-documentaries-about-audi-a4-spare-key-47040541