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 is in need of replacing. To replace the battery, open the metal key using flathead, then pop the back cover up using a screwdriver. https://auto-locksmiths43493.blog-gold.com/36714446/why-is-there-all-this-fuss-about-audi-a4-spare-key