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, turn off the metal key and use a flathead screwdriver to remove the back cover. https://auto-locksmiths02894.wssblogs.com/30040255/audi-a4-spare-key-tips-that-can-change-your-life