How to Save Money on Audi Battery Replacement Is your Audi key fob having trouble locking and unlocking it? This may be a sign that the battery must be replaced. To replace the battery, simply open the key made of metal using a flathead and pop the back cover open https://g2809755.glifeblog.com/29525431/what-is-audi-a4-spare-key-and-why-is-everyone-talking-about-it