How to Replace the Mercedes Key Battery? Step-By-Step Tutorial

How to Replace the Mercedes Key Battery? Step-By-Step Tutorial

This blog walks you through how to open your car key fob and replace your Mercedes-Benz key battery step by step.

Your Mercedes-Benz car ought to start right away when you press the button on your key fob. This means that if the battery in your Mercedes-Benz key fob isn’t consistently functioning, it might be time to replace it.

This blog describes how to open your Mercedes-Benz key fob, how to change the battery in your Mercedes-Benz key fob, and how to determine when you need a key fob battery replacement.

How to Replace the Mercedes Key Battery?

Perplexed as to how to operate a Mercedes-Benz key fob? Opening a Chrome Key differs from opening a SmartKey®. But replacing the battery is very simple once you know how to open your specific key fob.

To open a Mercedes-Benz Chrome Key and replace the battery:

  1. First, you have to pull down on the silver, square-shaped tab on the bottom of the key. Pull until it releases.
  2. You’ll notice a small gap in the fob once you’ve separated the tab. The key cover can be opened by inserting the key into the flat, narrow end of the fob.
  3. Replace the outdated battery with the new one. Ensure that the new battery is facing the appropriate direction.

To open a Mercedes-Benz Smart Key and replace the battery:

  1. The key should automatically come out of the fob when you pull on the latch end.
  2. The end of the key fob has a slot that can be seen after the key releases.
  3. To open the battery compartment, insert the key into this slot.
  4. After ensuring that it is facing the proper direction, replace the old battery with the new one.
How to Replace the Mercedes Key Battery? Step-By-Step Tutorial

When a Mercedes-Benz Key Fob Battery Needs Replacement?

If you think your Mercedes-Benz key fob battery is dying, check to see if you’re experiencing any of the warning signs below:

  • It takes longer and/or requires more attempts to start your car now.
  • You are having trouble using your key to activate the panic alarm or locking or unlocking your doors.
  • The charging system has a problem, according to a warning sign on your dashboard.

You probably need to change the battery in your Mercedes-Benz key fob if you’ve noticed any of the warning signs listed above.

Which Type of Mercedes-Benz Car Key Fob Do I Have?

Your type of key will determine how many batteries you’ll need. Chrome Keys are one variety of key fobs. This key comes in a metal casing and is for newer Mercedes-Benz models.

The Chrome Key is also available in two different versions, one of which is more recent. Compared to the older version, the newer version only requires one battery. The panic button on your Chrome Key will tell you which model you have; older Chrome Keys have a circular panic button, while newer Chrome Keys have a triangular panic button.

The SmartKey®, which is designed for earlier Mercedes-Benz models, is the other kind of key fob you might possess. This key is usually made out of plastic and needs two batteries.

Conclusion: Replace the Mercedes Key Battery

Replace the batteries in any Mercedes keys or key fobs that aren’t consistently working. You can follow a few steps to make your key operate like new once more.

  1. Locate the sliding tab at the key holder’s end and pull it.
  2. The battery cover will be popped when you pull the valet key or mechanical key and place it in the vacant slot in the corner.
  3. Take off the battery compartment’s cover.
  4. Ensure that both batteries are removed and replaced in the proper orientation.

The lifespan of the special batteries used in key fobs can range from five to ten years, depending on usage frequency, temperature extremes, and battery quality.


What Kind of Battery Does a Mercedes Key Fob Take?

Get the Right Batteries: You’ll need one CR 2025 battery for the newer Chrome Key, as opposed to the two required by the earlier SmartKey&reg.

Can I Change the Mercedes Battery Myself?

For the DIY car enthusiast, battery replacement on a Mercedes-Benz is a fairly easy task to master. Only a replacement battery and some simple tools are required. Beyond that, you’ll need to know where the vehicle’s battery is located and how to disconnect it in order to make room for the replacement one.

Can I Use CR2032 Instead of CR2025 in the Mercedes Key Fob?

For as long as either fits in the battery compartment, the CR2025 and CR2032 may be used interchangeably with minimal effect although due to its higher capacity (mAh), CR2032 would likely last a little bit longer.

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