How to Save Money on Audi Battery Replacement Does your Audi key fob have trouble locking and unlocking? This could indicate that the battery needs to be replaced. To replace the battery, open the metal key using an flathead and then open the back cover open using the screwdriver. Replace https://autolocksmiths04400.jts-blog.com/29476274/10-unexpected-audi-a4-spare-key-tips