How to Save Money on Audi Battery Replacement Is your Audi key fob having difficulty locking and unlocking it? This could be a sign that the battery is in need of replacement. To replace the battery, open the metal key with flathead, then pop the cover off using a screwdriver. https://g2823931.thezenweb.com/there-s-a-good-and-bad-about-audi-a4-spare-key-68053674