How to Change the Battery in Your Mercedes Key Fob

November 12th, 2018 by

Mercedes-Benz technician working on the window of the car

Is your Mercedes-Benz key fob about to die? There’s no need to worry. Mercedes-Benz of Greenwich is here to teach you the low battery warning signs to watch out for, as well as how to change the battery in your Mercedes-Benz key fob. Use our handy Mercedes-Benz key fob replacement guide, and contact our Greenwich service center at 866-285-4034 if you need any help along the way!

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When a Mercedes-Benz Key Fob Battery Needs Replacement

There are a few key warning signs to watch out for when it’s about time to change your Mercedes-Benz key fob. These include:

  • Your vehicle becomes more difficult to start. If it takes several minutes to turn on or multiple tries to start, your key fob may have a low battery.
  • You can’t lock/unlock the doors or employ the panic alarm.
  • Your dashboard shows a warning sign that shows an issue with the charging system.

If any of these Mercedes-Benz low battery warning signs occur, it’s a good idea to be proactive and change the battery in your Mercedes-Benz key fob to avoid any issues on your Rye drive.

How to Replace the Battery on a Mercedes-Benz Key Fob

Is it time to replace the battery in your Mercedes-Benz key fob? Follow these simple steps:

  • Determine Key Type
    • Check if you have a Chrome Key or a SmartKey® — this will factor into changing the battery.
      • Most older Mercedes-Benz models are paired with a SmartKey®. Unlike the Chrome Key, it is cased in plastic.
      • If your Mercedes-Benz key fob is cased in metal, it’s a Chrome Key! To determine if your Chrome key is old or new, take a look at the panic button. Is it circular (old) or triangular (new)?
  • Choose the Right Batteries
    • A SmartKey® requires two CR 2025 batteries, and the older Chrome Key does too.
    • The newer Chrome Key only requires one.
  • SmartKey® Battery Replacement Steps
    • In order to change your SmartKey® battery:
      • Pull the latch at the end of the key holder.
      • Put your key horizontally into the open slot.
      • Take the battery compartment out.
      • Replace the existing CR 2025 batteries with two new ones.
  • Chrome Key Battery Replacement Steps
    • In order to change your Chrome Key battery:
      • Pull on the tab at the bottom of the fob.
      • Push the key into the narrow end of the slot to remove the cover.
      • Then simply replace the battery with a new CR 2025.

Although it’s not especially difficult to learn how to change the battery in your Mercedes-Benz key fob, it’s even easier to schedule a Mercedes-Benz key fob battery replacement service at Mercedes-Benz of Greenwich.

Explore Mercedes-Benz Service Costs at Mercedes-Benz of Greenwich

If you need any assistance while replacing your battery or have any Mercedes-Benz service questions, such as “Why is my steering wheel shaking,” be sure to contact our service center to cover your service needs for reasonable prices. Contact us with any questions you have, and be sure to check out our service specials before driving in from Stamford or New Canaan for your next appointment!

Mercedes-Benz Service Specials

Veteran Appreciation Offer

Mercedes-Benz of Greenwich supports our Veterans with 10% off service work on their Mercedes-Benz. 

  • Be sure to bring your Veteran Issued ID and show the Service Advisor at the time of your appointment.

Thank you for your service.



Present coupon at time of write-up. Veteran Issued ID is required at time of write-up. Cannot be combined with other offers or coupons. One-time use only. See Service Advisor for complete details. Some restriction may apply. Expires at end of month.

Complimentary Uber Service

We offer Uber as a transportation option for when you need your car serviced!

Ask your Service Advisor about taking advantage of our complimentary Uber Service

Present when order is written. Can't combine with other offers. Invalid for prior purchases. Not responsible for typographical/printing errors. Some models are higher. Other restrictions may apply. Local pick-up and delivery.

Collision Center Complimentary Estimate

Our state-of-the art body shop is equipped to handle body repairs and restorations.

Call today to schedule an appointment for a Complimentary estimate. 

Expires at end of month.

Dealer Select Specials

Proudly Offers

Valet Service, Express Service, Complimentary Car Wash + Vacuum, Free-Wifi, Complimentary Shuttle Service, State-of-the Art Facility and Equipment, Continental Breakfast, New Mercedes-Benz Loaner Vehicle

**Complimentary valet service to and from train station. Mercedes-Benz of Greenwich service department offers a shuttle service to and from the Greenwich Metro train station our shuttle service will drop you off starting at 7:00 AM and our last pick-up in the evening at 8:00 PM. Contact your Service Advisor for more information.
Touch Free Service w/ Night Drop Off!
Night Drop-Off
• Fill Out Envelope With Your Information
• Sign Envelope And Insert Your Keys
• Insert Envelope Into Drop Box
• Service Advisor Will Contact You Within 24 Hours Or Less

When the service is complete, we will wash your vehicle and disinfect all touch point areas inside the vehicle (door handles, shifter, center console, front seats, dashboard and the ignition key). After cleaning the steering wheel, we will install a steering wheel cover. 

Posted in Parts, Service