How to Save Money on Audi Battery Replacement Is your Audi key fob not locking and unlocking? This may be a sign that the battery needs to be replaced. To replace the battery, you must open the metal key with a flathead and pop the cover off with the screwdriver. https://car-locksmiths18122.amoblog.com/15-best-documentaries-on-audi-a4-spare-key-51760829