How to Save Money on Audi Battery Replacement Does your Audi key fob have issues locking and unlocking? This could indicate that the battery is in need of replacing. To replace the battery, flip open the key made of metal and use a flathead screwdriver to open the back cover. https://car-locksmiths18122.amoblog.com/audi-a4-spare-key-tools-to-make-your-everyday-lifethe-only-audi-a4-spare-key-technique-every-person-needs-to-know-51782096