How to Save Money on Audi Battery Replacement Does your Audi key fob have trouble locking and unlocking? This may be a sign that the battery is in need of replacement. To replace the battery, open the metal key using a flathead and pop the cover off with the screwdriver. https://g28carkeysolutions75362.bloggerbags.com/35033548/what-s-everyone-talking-about-audi-a4-spare-key-right-now