How to Save Money on Audi Battery Replacement Does your Audi key fob have trouble locking and unlocking? This could be a sign that the battery is in need of replacement. To replace the battery, flip open the metal key and use a flathead screwdriver to open the back cover. https://auto-locksmiths69774.blogthisbiz.com/36424446/5-arguments-audi-a4-spare-key-is-actually-a-great-thing