How to Save Money on Audi Battery Replacement Does your Audi key fob have trouble locking and unlocking? This could 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 open using the screwdriver. https://autolocksmiths64294.blog5star.com/30254725/why-audi-a4-spare-key-is-relevant-2023