How to Save Money on Audi Battery Replacement Does your Audi key fob have issues locking and unlocking? This could be a sign the battery is in need of replacing. To replace the battery, turn off the metal key and use a flathead screwdriver to pop up the back cover. https://carlocksmiths68698.bloggazzo.com/29465742/what-audi-a4-spare-key-experts-want-you-to-be-educated