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How to Change the Key Fob Battery on the Mercedes A-Class W177

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

In this guide, you will see how to disassemble and replace the battery in the key fob for the Mercedes A-Class W177, as well as the B-Class and vehicles from this manufacturer from 2018 onwards. First, take your key fob and start by removing the plastic back cover by pressing the button; then, pull out the battery compartment from the key fob, as shown in the video. At this point, remove the battery and replace it with the correct type (in this case, a CR 2032 3V). Finally, insert the battery compartment and the cover!

Updated on 26 April 2026 by ScegliAuto

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