How to Change Your Mercedes-Benz Key Fob Battery

August 29th, 2019 by

Closeup of open Mercedes-Benz key fob and battery

Have the batteries in your Mercedes-Benz key fob died? While you’ll still be able to start your vehicle manually,  you won’t be able to remotely unlock your car in Mililani or trigger the car’s panic mode in Kaneohe until you replace your Mercedes-Benz key battery. While both Mercedes-Benz keys take the same type of battery, the kind of key you have will impact the number of batteries you need and how you perform your Mercedes-Benz key fob battery change. Learn how to change your Mercedes-Benz key battery on your own below with this guide from Mercedes-Benz of Honolulu!

How to Figure Out Which Mercedes-Benz Key Model You Have

There are different types of Mercedes-Benz key models. The model you have determines how many CR 2025 batteries you’ll need, along with the type of method you’ll use to change the battery. First, you have to identify whether you have a Smart Key or a Chrome Key.

  • Smart Key: The Smart Key is for older Mercedes-Benz models and is usually made of plastic. Both new and old versions require two batteries.
  • Chrome Key: Belonging to newer Mercedes-Benz models, these keys have a metal casing. Newer Chrome Keys require one battery, while the older Chrome Keys need two. You can distinguish whether you have a newer or older model key by the shape of the panic button; newer Chrome Keys have a triangular panic button, and older versions have a circular panic button.

How to Open a Mercedes-Benz Key Fob

Depending on whether you have a Chrome Key or a Smart Key, you’ll find different Mercedes-Benz battery replacement instructions. Here are step-by-step instructions for how to open a Mercedes-Benz key:

  • Chrome Key: To open the Chrome Key fob, pull down on the bottom tab of the key, and pull back until the key releases. This tab should be small, silver, and square-shaped. There will be a small gap in the fob once the key releases. To open the key’s cover, press the key into the flat and narrow end of the fob.
  • Smart Key: To open a Smart Key fob, take note of the latch at the end of the fob. When you pull this latch, the key will remove itself from its holder. Then, you’ll see a slot at the end of the key fob. Open the battery compartment by pushing into the slot with the key.

When the Mercedes-Benz key cover of your fob is off, you’ll see the old battery. Remove the battery, and dispose of it. Then, replace it with your new battery. Note: It’s important to make sure the new battery is facing the right way!

Get More Key Fob Tips at Mercedes-Benz of Honolulu!

Get more information on where to buy a Mercedes-Benz key battery and enjoy additional DIY service tips from our team at Mercedes-Benz of Honolulu, including tips on how to change your hood ornament! We’re available to answer all inquiries, including questions about service specials or our new Mercedes-Benz models. Contact us online, or visit our dealership in person! We’re just a short drive from Ewa Beach and Waipahu!

Posted in FAQ, Service, Service Tips, Tips