How to Save Money on Audi Battery Replacement Does your Audi key fob have issues locking and unlocking? This may be a sign that the battery must be replaced. To replace the battery, you must open the metal key with flathead, then pop the back cover up using the screwdriver. https://autolocksmiths53693.dbblog.net/3313127/how-to-know-the-audi-a4-spare-key-that-s-right-for-you