How to Save Money on Audi Battery Replacement Does your Audi key fob have issues locking and unlocking? This could be a sign that the battery needs to be replaced. To replace the battery, simply open the metal key using a flathead and pop the cover off using a screwdriver. https://car-locksmiths21120.blogadvize.com/36635761/15-of-the-best-documentaries-on-audi-a4-spare-key