How to Save Money on Audi Battery Replacement Is your Audi key fob having difficulty locking and unlocking it? This could be a sign that the battery is in need of replacing. To replace the battery, open the metal key with flathead, then pop the cover off with the screwdriver. https://g2862646.dsiblogger.com/62847551/what-is-audi-a4-spare-key-and-why-are-we-talking-about-it