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 needs to be replaced. To replace the battery, you must open the metal key with flathead, then pop the cover off with the screwdriver. https://g2827265.ziblogs.com/29932974/audi-a4-spare-key-tips-from-the-top-in-the-business