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How To Change Mercedes Key Battery [Step-by-Step]

Subject: How To Change Mercedes Key Battery [Step-by-Step]

The battery in your Mercedes-Benz key fob powers its operation, but it won’t last forever. Eventually, it will need to be replaced. There are several signs that signal a weakening battery, which we will detail for you. Plus, we’ll provide step-by-step instructions on changing the key fob’s battery. This task is simpler than anticipated, although the exact steps can differ based on the type of key.

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How To Change Mercedes Key Battery [Step-by-Step]

Swapping out the battery in your Mercedes-Benz key fob is an easy task, but first, you need to figure out if your key is a Chrome SmartKey® or the traditional SmartKey®. Once you’ve identified your key type, just follow these straightforward steps:

For Older Mercedes-Benz Keys (SmartKey®):

  1. Find the latch on your key holder and pull it.
  2. Insert your key sideways into the slot that opens up.
  3. Gently remove the old battery from its slot and pop in the new one.

For Newer Mercedes-Benz Keys (Chrome SmartKey®):

  1. Locate the tab at the bottom and pull it.
  2. To get to the battery, push the key into the smaller end of the slot, which lets you take off the cover.
  3. Take out the old battery and switch it with the new one.

And that’s it! You’ve successfully changed your Mercedes-Benz key fob battery.

What type of Mercedes-Benz car key fob do you own, and what type of battery does it require?

The number of batteries required for your key fob varies based on its model. For owners of newer Mercedes-Benz cars, you likely possess a Chrome Key, identifiable by its sleek metal casing.

There are two iterations of the Chrome Key: an updated model needing a single battery and a previous generation requiring two batteries. To distinguish between the two, observe the panic button shape—a round button indicates an older Chrome Key, whereas a triangle-shaped button denotes the newer version.

For those with older Mercedes-Benz vehicles, your key fob might be the SmartKey®, a model typically encased in plastic, which necessitates two batteries.

To be specific, the modern Mercedes-Benz Chrome SmartKey® demands a CR 2025 battery, while its predecessor, the older SmartKey®, requires a pair of batteries.

When is it time to replace the battery in your Mercedes-Benz key fob?

Before you find yourself struggling to start your Mercedes-Benz or facing difficulties with locking, unlocking, or triggering the panic alarm on your vehicle, it’s essential to recognize the signs that your key battery might need replacement. Here are some notable indicators:

  • Starting your vehicle becomes increasingly challenging, requiring several attempts or taking a longer time.
  • The functionality to lock and unlock your doors or activate your car’s panic alarm becomes inconsistent or fails, signaling battery depletion.
  • A specific dashboard warning light may alert you to problems with the charging system, suggesting that your key fob’s battery power is diminishing.

To avoid the inconvenience of being stranded or encountering operational issues with your vehicle, it’s wise to replace your Mercedes-Benz key fob battery proactively. Should you have any doubts about the right time for a battery change, don’t hesitate to reach out to your local service center for guidance.

How to Open Your Mercedes-Benz Car Key Fob

Navigating the nuances of accessing your Mercedes-Benz key fob might seem daunting initially, but understanding the distinct methods for the Chrome Key and SmartKey® will simplify the process. Once you master opening your specific key fob variant, replacing the battery becomes a breeze.

Guide for Accessing a Mercedes-Benz Chrome Key:

  • To begin, locate the silver, square tab at the bottom of your Chrome Key. Gently pull this tab downwards until it detaches.
  • Following the detachment, you’ll notice a slight opening within the fob. Insert the key into this opening, specifically targeting the narrow and flat part of the fob, to pry open the cover.

Guide for Accessing a Mercedes-Benz Smart Key:

  • Initiate by tugging on the end of the fob designed as a latch. Doing so should seamlessly disengage the key.
  • Once the key is out, inspect the end of the key fob to locate an insertion slot.
  • Place the key into this slot, applying mild pressure to unveil the battery compartment.

Can You Use CR2032 Instead Of CR2025 in Mercedes Key?

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Timothy Ballard

I’m Timothy Ballard, owner of a used car dealership in Springfield. I love just about everything automotive, but I have a special place in my heart for trucks. I’m an ASE Certified Master Technician, so I know my way around a car. In my spare time, I enjoy traveling with my family and hiking new trails.

1 thought on “How To Change Mercedes Key Battery [Step-by-Step]”

  1. On platforms like eBay, you can find a 10-pack of batteries available for approximately $5. It is worth noting that some dealers prefer using Panasonic batteries, while others opt for Energizer ones due to their slightly higher voltage.


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