How to Change the Battery in Your Mercedes-Benz Key

Have you noticed your Mercedes-Benz key isn’t performing as it should? You might notice it’s harder to unlock the door or the range is much lower. Perhaps it’s time to change the Mercedes-Benz key fob’s battery! But don’t worry, it’s a relatively simple fix. And if you want us to take care of it, the factory-trained technicians at Mercedes-Benz of Lafayette can help with this low Mercedes-Benz service cost.

Find out how to change the battery in a Mercedes-Benz key fob with our guide from Mercedes-Benz of Lafayette. We’ll have you back on Indianapolis roads in no time! This will work whether you own a C-Class sedan, a GLS SUV, or anything in between.

When Does a Mercedes-Benz Key Fob Battery Need Replacement?

Look for these signs or symptoms when it’s time to change your Mercedes-Benz key fob’s battery.

• You may notice your vehicle becomes more difficult to start. If it takes several minutes or multiple attempts, that can be an indicator of a low battery because the starter won’t work unless your key fob is in the car, too.
• If you lose the ability to lock and unlock your doors or set off the panic alarm that can also be a sign your battery is on the way out. You might need to change the Mercedes-Benz key fob battery if you notice a decreased range, too.
• If you see a warning sign on your dashboard that indicates an issue with the charging system, that can mean you are losing battery power in your key fob. 

It’s best if you change your Mercedes-Benz key fob battery promptly if you notice any of these signs. If that doesn’t solve the issue, bring your vehicle to our service center for a diagnosis. Next, we’ll show you how to change the battery in a Mercedes-Benz fob.

How to Change the Battery in a Mercedes-Benz Key Fob

When it comes time to replace your Mercedes-Benz key fob battery, follow these simple steps:

• Determine Your Key Type

Whether you have a newer Chrome SmartKey® or an older SmartKey®, the key type will impact how to change the Battery in a Mercedes-Benz key fob.

• Get the Right Battery

The newer Chrome SmartKey® calls for one CR 2025 battery while the older SmartKey® calls for two.

• Use SmartKey® for Older Models

To replace the battery in your key fob for SmartKey®, pull the latch at the end of the key holder, push your key horizontally into the open slot, and then lift the battery out of the compartment. 

• Utilize Chrome SmartKey® for Newer Models

Pull the tab at the bottom, remove the cover by pushing the key into the narrow end of the slot then place the battery inside for Chrome SmartKey®.

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

Need help replacing your Mercedes-Benz key fob battery? Contact us or call (765) 257-2965 with any questions or to make a service appointment. We’re happy to help in any way we can so you can get back to cruising around on the Frankfort and Kokomo roads!