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Replacing the Key Battery on the Mercedes C-Class W203

Model: Mercedes Classe C W203 - Years 2000-2007
Part: Key

In this brief video, learn how to disassemble and replace the remote key battery on the Mercedes Benz C-Class W203, third generation. First, take your remote and remove the physical key from it; then, pry open the slot to remove the battery compartment, as shown in the video. At this point, remove and replace the battery with a new one of the correct type and the same designation; simply insert it in the correct orientation and reassemble the battery holder back into the remote, following the video until the end!

Updated on 26 April 2026 by ScegliAuto

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