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How to Save Money on Audi Battery Replacement Is your Audi key fob not locking and unlocking? This could be a sign that the battery is in need of replacing. To replace the battery, simply open the key made of metal using an flathead and then open the back cover open using the screwdriver. Replace the battery with a CR1620 and then snap the shell back into the correct position. Low Rate Locksmith It's not common for the batteries in key fobs to go out of service or wear out over the course of time and t