This is a video that shows you how to replace key fob battery on Mercedes-Benz B-Class, C-Class (2001-2007), R-Class, CLA, SL, E-Class, ML, M-Class, CLS, CLK, GLK, GL, S-Class, C230, SL500, E320, ML320, S500 S550 C240 E350 E500 E55 S55 S430, S600 SLK320 SLK340 R350 R500 ML320 ML500 GL350 GL450, etc.

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1. Slide that gray button on the left side to remove the emergency key (blade)
2. Push that plastic pin from inside and in the same pull that middle part up
3. Remove the middle part from the key fob and replace those two batteries
There are two 3V CR2025 batteries
You can pull on that spring to release it if you can’t remove the batteries.
4. Install the middle part bakc on the key fob
5. Put the blade back in the key fob.

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