How to change fob battery W204

Hi here is my recorded step to change the fob battery (CR2025) 2  units


Step 1:
flip this switch to remove the physical key from the fob


Step 2:
pull the physical key out



Step 3:
User the end of the physical key as a handle to flip the inner switch of the fob, and (green arrow) slowly pull the cover, it comes out with the battery and the circuit board.





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