How to Save Money on Audi Battery Replacement Does your Audi key fob have issues locking and unlocking? This could indicate that the battery must be replaced. To replace the battery, flip open the metal key and use a screwdriver with a flat head to pop up the back cover. https://g2891723.blogerus.com/52914145/learn-about-audi-a4-spare-key-while-working-from-your-home