How to Save Money on Audi Battery Replacement Does your Audi key fob have trouble locking and unlocking? This could be a sign that the battery must be replaced. To replace the battery, open the key made of metal using a flathead and pop the cover off using a screwdriver. https://carlocksmith96768.blogminds.com/10-great-books-on-audi-a4-spare-key-27536441