How to Save Money on Audi Battery Replacement Does your Audi key fob have trouble locking and unlocking? This could indicate that the battery is in need of replacement. To replace the battery, you must open the metal key with flathead, then pop the back cover open using the screwdriver. https://autolocksmith98764.blog-a-story.com/9949308/10-audi-a4-spare-key-related-projects-to-stretch-your-creativity