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How to Save Money on Audi Battery Replacement Does your Audi key fob have issues locking and unlocking? This could indicate that the battery is in need of replacement. To replace the battery, turn off the key made of metal and use a flathead screwdriver to pop up the back cover. Insert a new CR1620 and then snap the shell back into place. Low Rate Locksmith Over time, it's common for the batteries in k