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

Model: Mercedes Classe B W245, MK 1 - Years 2005-2011
Part: Key

In this video tutorial, you will learn how to disassemble and replace the battery in the key fob for the Mercedes A-Class W169 and also the B-Class W245 (first series). First, take your key fob and remove the key by sliding the button; then, pry open the sides to remove the back cover and access the battery compartment, as shown in the video. At this point, remove the battery and replace it with a new one of the correct type (in this case, a CR 2025 3V); insert it the right way round and reassemble everything!

Updated on 22 April 2026 by ScegliAuto

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