GarageDex

Mercedes-Benz S-Class key fob battery

GarageDex's key fob data shows the Mercedes-Benz S-Class key fob takes a CR2025 coin cell across the 2007 to 2012 model years.

Shop CR2025 batteries A 2-pack covers both fobs

Key takeaways

  • 2008 to 2012 Mercedes-Benz S-Class: CR2025.
  • CR2025: 20 mm wide, 2.5 mm thick - thinner than a CR2032, do not swap them.
  • Same cell across every listed year.
  • Note which side faces up before removing the old cell.
Mercedes-Benz S-Class key fob battery by year
YearsFob typeBatteryNotes
2008 to 2012Standard fobCR202520 mm wide, 2.5 mm thick - thinner than a CR2032, do not swap them
2007Standard fobCR20252PCS

How to change the Mercedes-Benz S-Class fob battery

  1. Slide out the mechanical key if the fob has one, and look for a slot or notch along the seam.
  2. Twist a coin or a small flat screwdriver in the slot to split the case. Work around the seam rather than forcing one point.
  3. Note which side of the old cell faces up, then lift it out with a fingernail or plastic pick - avoid metal tools across the contacts.
  4. Fit the new CR2025 the same way up, snap the halves together, and test the lock button before walking away from the car.

Batteries and tools for the Mercedes-Benz S-Class fob

Coin cells are universal - any brand's CR2025 fits. Buy a multi-pack so the second fob gets a fresh cell too.

CR2025 batteriesName-brand multi-pack, check the date codeShop batteries Plastic pry toolOpens the case without scratching itShop tools Fob coverSilicone case filtered to the Mercedes-Benz S-ClassShop covers

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Other Mercedes-Benz models

C-ClassE-Class

Source: Microbattery - Key Fob Battery Finder. Fob designs change mid-generation, so confirm the code printed on the cell you take out before you order.