How to Save Money on Audi Battery Replacement Are you experiencing issues with your Audi key fob having trouble locking and unlocking? This could indicate that the battery must be replaced. To replace the battery, turn off the metal key and use a flathead screwdriver to remove the back cover. https://autolocksmiths04400.jts-blog.com/29378170/15-shocking-facts-about-audi-a4-spare-key-you-ve-never-known