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Here is a quick and easy demonstration video on how to replace the dead / weak battery in your AMG key fob. This specific one is out of an C63. You do not need any tools. First step is to remove the mechanical key and use that to pry off the back cover. Once you have that back cover off, you can use your key (or a screwdriver) to pry out the dead / weak 2032 battery. Clip your back cover and on and you're back in business. Hope you found the video helpful!