Is your Mercedes-Benz key fob becoming less responsive? Do you have to press the buttons multiple times to lock or unlock your car? It might be time to replace the battery in your key. Fortunately, changing the battery in your Mercedes-Benz key is a straightforward process that you can easily do yourself at home, saving you a trip to the dealership. This guide will walk you through the simple steps on How To Change Battery Of Mercedes Benz Key, ensuring your key fob is working perfectly again in no time.
Step 1: Identify Your Mercedes-Benz Key Type
Mercedes-Benz keys come in various styles depending on the model and year of your vehicle. Before you begin, it’s important to identify the type of key you have. Most modern Mercedes-Benz keys are either chrome-backed or all-black plastic. Knowing your key type will help you locate the battery compartment and the correct way to open it.
Step 2: Gather the Necessary Tools
You won’t need many tools for this simple task. Here’s what you’ll likely require:
- A new battery: Most Mercedes-Benz key fobs use a CR2025 or CR2032 type battery. Check your owner’s manual or the old battery for the exact type before purchasing a replacement. It’s always a good idea to have a fresh, high-quality battery for optimal performance.
- A small flathead screwdriver or a similar tool: This will be used to gently pry open the key fob and access the battery compartment. A plastic trim tool can also be used to prevent scratches.
- A soft cloth (optional): To protect the key fob from scratches during the process.
Step 3: Open the Key Fob
The method for opening your Mercedes-Benz key fob varies slightly depending on the model. Here are the general steps for the most common types:
For Chrome-Backed Keys:
- Locate the small release latch or button, usually on the side or back of the key fob, often near the metal key ring.
- Slide or press the latch while simultaneously pulling out the metal emergency key. This is usually a small, slim metal key that slides out from the key fob.
Alt text: Chrome Mercedes-Benz key fob with the emergency key removed, showing the opening where the key was located.
- Once the emergency key is removed, you will often see a small slot or indentation revealed where the key was.
- Insert the small flathead screwdriver into this slot and gently twist or pry. This should separate the two halves of the key fob. Be careful not to apply too much force to avoid damaging the plastic casing.
For All-Black Plastic Keys:
- Look for a small notch or split line on the key fob casing, often on the side edge.
- Carefully insert the flathead screwdriver into this notch.
- Gently twist or pry to separate the two halves of the key fob. These keys might require slightly more force, but still be gentle to avoid damage.
Alt text: Opened black plastic Mercedes-Benz key fob showing the internal components and battery compartment.
Step 4: Remove the Old Battery
Once the key fob is open, you will see the battery. Note the orientation of the battery (positive (+) and negative (-) sides). This is crucial for inserting the new battery correctly.
- Gently use your fingertip or the small screwdriver to nudge the old battery out of its compartment. Be careful not to damage the battery contacts.
Alt text: Close-up of fingers removing the old CR2025 battery from the Mercedes-Benz key fob battery compartment.
Step 5: Install the New Battery
- Take your new battery and insert it into the battery compartment, ensuring the correct orientation (+ and – sides matching the markings in the compartment or how the old battery was placed).
- Press down gently to ensure the battery is securely seated in the compartment.
Alt text: Inserting a new CR2032 battery into the Mercedes-Benz key fob, ensuring correct polarity.
Step 6: Reassemble the Key Fob
- Carefully align the two halves of the key fob casing.
- Press them firmly together until they snap back into place. Ensure there are no gaps and the key fob is securely closed.
- If you removed the emergency key, slide it back into its slot until it clicks and is securely locked in place.
Step 7: Test Your Key
Test the buttons on your Mercedes-Benz key fob to ensure it is working correctly. Try locking and unlocking your car remotely, and if your car has it, test the panic button. If everything works as expected, you have successfully changed your Mercedes-Benz key battery!
Tips and Considerations
- Battery Type: Always double-check the battery type required for your specific Mercedes-Benz key. Using the wrong type might cause issues.
- Gentle Handling: Be gentle when opening and closing the key fob to avoid damaging the plastic components.
- Key Not Working After Battery Change? If your key is still not working after replacing the battery, double-check the battery orientation, ensure the battery is new and fully charged, and try cleaning the battery contacts inside the key fob. In rare cases, the key fob itself might have an issue, and you may need to consult a Mercedes-Benz dealer.
- Frequency of Replacement: Depending on usage, you may need to change your Mercedes-Benz key battery every 1-2 years. Pay attention to the range and responsiveness of your key fob as indicators for battery replacement.
Changing the battery of your Mercedes-Benz key is a simple maintenance task that any owner can perform. By following these steps, you can keep your key fob working reliably and avoid any inconvenience caused by a dead key battery. Enjoy the peace of mind knowing you’ve taken care of this small but essential part of your Mercedes-Benz ownership experience.
