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How to Replace the Key Battery of a Mercedes S-Class?

Model: Mercedes Classe S W223 - Years: 2020, 2021, 2022, 2023, 2024, 2025, 2026
Part: Key

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Video tutorial

To replace the key battery of a Mercedes S-Class, start by locating the small button or lever on the key shell. Press it or lift the lever to extract the metal key. Use a flat screwdriver or a similar tool to carefully open the key shell.

Once opened, find the battery position inside the shell. Carefully remove the old battery using a small screwdriver or a similar tool to pop it out. Make sure to remember the orientation of the battery.

Take a new battery of the correct type and insert it into the same compartment, ensuring it is installed correctly. Close the key shell carefully, being cautious not to damage the internal components.

Ensure the key shell is securely closed before reinserting the metal key. Test the key to ensure it works properly by using the lock and unlock commands to check the vehicle's response.


Updated on 29 September 2026 by ScegliAuto


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by ScegliAuto

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