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How to Replace the Key Battery for the Mercedes C-Class

Model: Mercedes Classe C W205 - Years 2014-2021
Part: Key

For this simple operation, follow the steps illustrated in this short video guide. First, press the button on top of the key to extract the emergency key, which you can use to open your vehicle if the battery is dead. This way, you can pull out the key and use it to lift the back panel of your key, giving you access to the slot where the battery is housed. Install the new battery and retrace the steps described for reassembling the various components.

Updated on 27 February 2026 by ScegliAuto

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