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How to Replace the Key Fob Battery in a Mercedes A-Class

Model: Mercedes Classe A W177 - Years 2018-2026
Part: Key

To replace the key fob battery in a Mercedes A-Class, extract the integrated mechanical key by pressing the release button on the fob. Next, use the key itself or a small tool to detach the rear cover of the shell. Once the battery compartment is open, remove the dead battery, paying attention to the orientation and polarity. Insert a new battery of the same type, ensuring it is correctly positioned in the slot. Finally, close the cover until it clicks into place, reinsert the mechanical key, and check the operation of the vehicle's lock and unlock buttons.

Posted on 9 July 2026 by ScegliAuto

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