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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 is in need of replacing. To replace the battery, open the key made of metal using an flathead and then open the back cover up using the screwdriver. Replace the battery with a CR1620 and then snap the shell in place. Low Rate Locksmith Over time, it's typical for the batteries in key fobs to degrade or die, which causes them to ceas