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How to Save Money on Audi Battery Replacement Is your Audi key fob having difficulty locking and unlocking it? This could indicate that the battery must be replaced. To replace the battery, turn off the key made of metal and use a flathead screwdriver to open the back cover. Insert a new 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 become worn out over time and the device will cease to func