How to Save Money on Audi Battery Replacement Does your Audi key fob experience difficulty locking and unlocking? This could indicate that the battery is in need of replacement. To replace the battery, you must open the metal key with a flathead and pop the cover off using a screwdriver. https://car-locksmiths40831.thekatyblog.com/29242434/how-to-know-if-you-re-in-the-right-place-for-audi-a4-spare-key