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Open & Change Your Mercedes-Benz Key Battery

Mercedes-Benz Key

If your car key is no longer working properly, the battery most likely needs to be replaced. Luckily, you don’t have to be an expert to replace the key battery. The service team at Fletcher Jones Motorcars of Fremont will walk you through how to find out what kind of key you have and how to open the key. Then, they’ll show you the steps to change your Mercedes-Benz key battery.

If you’re not sure when to change your Mercedes-Benz key battery, you’ll get some great tips about that as well from our guide. For all of your major and minor Mercedes-Benz service needs around San Jose, you can trust our dealership.

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

The number of batteries you need depends on the type of key you have. One type of key fob is the Chrome Key, which comes in a metal casing and is for newer Mercedes-Benz models. Additionally, there are two versions of the Chrome Key: a newer version and an older version. The newer version needs one battery, and the older version needs two. To determine which Chrome Key you own, take note of what the panic button looks like; the older Chrome Keys have a circular panic button, and the newer Chrome Keys have a triangular panic button.

The other type of key fob you may have is the SmartKey®, which is made for older Mercedes-Benz models. This key is usually made out of plastic and needs two batteries. For more questions about what type of key you have, reach out to us online or make the drive to us from Sunnyvale.

When to Change Your Mercedes-Benz Key Battery

Before we go over how to change your Mercedes-Benz key battery, let’s first take a look at how to know it needs to be changed. Here are some common warning signs you might experience as you drive around Bay Area:

  • You may notice your vehicle becoming more difficult to start. If it takes several minutes or multiple attempts, that can be an indicator of a low battery.

  • If you lose the ability to lock and unlock your doors or set off the panic alarm, that can also be a sign that your battery needs to be replaced.

  • If you notice a warning sign on your dashboard that indicates an issue with the charging system, that can mean your key battery is losing power.

If you’re still unsure about when to change your Mercedes-Benz key battery, reach out to the service center at Fletcher Jones Motorcars of Fremont. Otherwise, we have plenty of additional service tips you can check out, including how to start your Mercedes-Benz with a metal key.

How to Open Your Mercedes-Benz Car Key Fob

Confused on how to open a Mercedes-Benz key fob? Opening a Chrome Key is different than opening a SmartKey®. Once you know how to open your particular key fob, though, changing the battery is very straightforward.

Steps to Open a Mercedes-Benz Chrome Key:

  1. First, you have to pull down on the silver, square-shaped tab on the bottom of the key. Pull until it releases.

  2. Once you separate the tab, you’ll see a small gap in the fob. Push the key into the narrow and flat end of the fob to open the key cover.

Steps to open a Mercedes-Benz Smart Key:

  1. Pull on the latch end of the fob, and the key should be removed on its own.

  2. After the key is released, there will be a visible slot at the end of the key fob.

  3. Press the key into this slot to open the battery compartment.

What Are the Steps to Change Your Mercedes-Benz Key Battery?

Confused about how to open a Mercedes-Benz key fob? Opening a Chrome Key is different than opening a SmartKey®. Once you know how to open your particular key fob, though, changing the battery is very straightforward. Here are the steps to change your Mercedes-Benz key battery based on the type of key you have:

Mercedes-Benz Chrome Key

  1. First, you have to pull down on the silver, square-shaped tab on the bottom of the key. Pull until it releases.

  2. Once you separate the tab, you’ll see a small gap in the fob. Push the key into the narrow and flat end of the fob to open the key cover.

  3. Remove the old battery and replace it with the new battery. Make sure the new battery is facing the correct way.

Mercedes-Benz Smart Key®

  1. Pull on the latch end of the fob, and the key should come out on its own.

  2. After the key is released, there will be a visible slot at the end of the key fob.

  3. Press the key into this slot to open the battery compartment.

  4. After making sure it’s facing the right way, replace the old battery with the new one.

As you can see, the process is pretty straightforward and can be done without having to drive to us from San Francisco. However, if you don’t want to perform the steps to change your Mercedes-Benz key battery, schedule service with our team!

Keep Your Mercedes-Benz Key Battery Working in Fremont!

Now that you know how to change your Mercedes-Benz key battery, you can be better prepared to enjoy the benefits of your key fob as you drive around Hayward. To learn where to buy a Mercedes-Benz key battery and for answers to all other inquiries, contact us at Fletcher Jones Motorcars of Fremont. We can help provide all kinds of tips for your Mercedes-Benz, such as how to check the tire pressure and how to optimize your vehicle’s fuel efficiency.

Featured Service Special

Mercedes-Benz Complimentary Vehicle Fault Code Scan Special

Complimentary

Receive a Complimentary Vehicle Fault Code Scan.

Special internet offer must be presented to the Service Advisor at the time of write-up and prior to the service being performed.Valid at Fletcher Jones Motorcars of Fremont. Cannot be combined with any other offer or applied to past services. Does not include applicable taxes, shop supplies, and hazardous waste fees. Limit one original offer per person. Other restrictions may apply. Void where prohibited. See Dealer for details. Offer Code: CF

Expires: 06/30/2026
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Fletcher Jones Motorcars of Fremont 37.499935, -121.976792.