How to Save Money on Audi Battery Replacement Does your Audi key fob experience difficulty locking and unlocking? This could be a sign that the battery needs to be replaced. To replace the battery, simply open the metal key with flathead, then pop the back cover up with the screwdriver. https://g28carkeysolutions81504.theblogfairy.com/29347365/what-audi-a4-spare-key-experts-want-you-to-know