The key of a modern Mercedes is much more than just a key, it is designed to be a multifunctional electronic tool. Little wonder then that the key fobs for Mercedes and other cars are often known as "Smart Keys." Regardless of what you call them, however, it is vital to ensure that your key fob has working batteries inside, otherwise you could be left without a way to enter your vehicle.
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Turn your Mercedes key fob over so you are looking at the back of it. Push down the backup key locking tab.
Slide the backup key away from the edge of the key fob. Insert the backup key into its storage compartment. Slide the key toward the locking tab to unlatch the battery storage compartment.
Pull the battery storage compartment out when it pops up from the fob. Now remove the batteries from the compartment and replace them with your new set of batteries. Ensure that you line up the positive (+) side of the battery with the contact clamp (the positive side should be facing you as you put it in place).
Re-insert the battery storage compartment into the key fob and replace the backup. Slide the backup key arm back into its mount and push it down to secure it in place. Test the key to ensure the process has been successful.
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