How to Save Money on Audi Battery Replacement Is your Audi key fob not locking and unlocking it? This could be a sign the battery is in need of replacement. To replace the battery, simply open the metal key using a flathead and pop the cover off using a screwdriver. https://g2862646.dsiblogger.com/62688487/15-audi-a4-spare-key-benefits-everyone-needs-to-know