How to Save Money on Audi Battery Replacement Do you find that your Audi key fob have issues locking and unlocking? This could be a sign that the battery must be replaced. To replace the battery, open the metal key and use a flathead screwdriver to remove the back cover. https://autolocksmith89181.blogsidea.com/36297252/the-reason-everyone-is-talking-about-audi-a4-spare-key-today