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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 needs to be replaced. To replace the battery, simply open the metal key with an flathead and then open the back cover open using a screwdriver. Install a new CR1620 battery and then snap the shell back in the correct position. 's not common for the batteries in key fobs to die or become worn out over time and the device will stop working. However, this