How to Save Money on Audi Battery Replacement Does your Audi key fob have issues locking and unlocking? This could be a sign that the battery needs to be replaced. To replace the battery, open the key made of metal and use a flathead screwdriver to open the back cover. https://auto-locksmiths70568.buyoutblog.com/29915737/how-to-recognize-the-audi-a4-spare-key-which-is-right-for-you