How to Save Money on Audi Battery Replacement Is your Audi key fob having trouble locking and unlocking? This could be a sign that the battery is in need of replacing. To replace the battery, flip open the metal key and use a flathead screwdriver to open the back cover. https://carlocksmith77960.idblogmaker.com/29307510/learn-about-audi-a4-spare-key-while-working-from-at-home