Introduction
If your Mercedes key isn't responding when you press any of its buttons, use this guide to replace the battery. This guide will display instructions on replacing the battery in the 2006-2015 Mercedes key fob for Cl-Class, R-Class, C-Class, E-Class, S-Class, GL-Class, ML-Class, and G-class. This easy-to-use step-by-step guide can help you quickly repair your key fob to continue usage. The only item required to restore the key is a replacement battery. The process is brief, taking only minutes to complete.
Tools
Parts
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The release switch is at the bottom of the key under the unlock button and the trunk button.
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Slide the release switch to the side.
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While sliding the release switch, pull the key out.
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Insert the pointed end of a spudger in the gap between the battery and the key.
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Push up after inserting the screwdriver to pry the battery out.
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***Note:2009 c-class release switch is on the back of the fob at the bottom.
Dustin DeShaney -