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How to Save Money on Audi Battery Replacement Is your Audi key fob having difficulty locking and unlocking? This could be a sign that the battery must be replaced. To replace the battery, you must open the key made of metal using a flathead and pop the back cover open with the screwdriver. Insert a new CR1620 and then snap the shell into the correct position. Low Rate Locksmith It's not common for the batteries in key fobs to fail or wear out over time, causing the device to cease to function.