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 replacing. To replace the battery, simply open the metal key using a flathead and pop the cover off using a screwdriver. https://auto-locksmiths06422.newbigblog.com/35797044/why-audi-a4-spare-key-should-be-your-next-big-obsession