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://car-locksmiths40831.thekatyblog.com/29063772/what-s-the-reason-audi-a4-spare-key-is-fast-increasing-to-be-the-hottest-trend-of-2023