How to Save Money on Audi Battery Replacement Is your Audi key fob not locking and unlocking it? This may be a sign that the battery must be replaced. To replace the battery, simply open the metal key with an flathead and then open the cover off using the screwdriver. https://car-locksmith17735.xzblogs.com/71366040/what-is-audi-a4-spare-key-how-to-use-it