It’s a common scenario: you reach for your Mercedes-Benz key fob, press a button, and nothing happens. Or perhaps you’ve noticed the range of your remote start decreasing. These are often the first signs that your Mercedes-Benz key battery is running low and needs replacing. Fortunately, replacing the battery in your Mercedes-Benz key fob is a straightforward process that you can easily do yourself at home, saving you time and a trip to the dealership. This guide will walk you through each step to ensure a smooth and successful key battery replacement.
Tools You’ll Need
Before you begin, gather these simple tools:
- A new CR2025 or CR2032 battery: (Check your owner’s manual or the old battery for the exact type. Most Mercedes-Benz keys use CR2025 or CR2032 batteries).
- A small flathead screwdriver or a similar thin tool: (A key or a sturdy plastic card can also work).
- A soft cloth or paper towel: (To protect the key fob from scratches).
Step-by-Step Guide to Replacing Your Mercedes Key Battery
Follow these steps to replace your Mercedes-Benz key battery:
Step 1: Open the Key Fob
Carefully examine your Mercedes-Benz key fob. You’ll typically find a small slot or release button.
- For keys with a release button: Locate the small button, usually on the side or bottom of the key fob. Press and hold this button while simultaneously pulling out the mechanical key blade. Once the mechanical key is removed, you will see a small opening.
- For keys with a slot: If you don’t see a button, look for a small slot, often near the key ring attachment. Insert the tip of your flathead screwdriver (wrapped in a cloth to prevent scratches) or your thin tool into this slot. Gently twist or pry to separate the two halves of the key fob. Be careful not to apply excessive force, as you could damage the casing.
Step 2: Remove the Old Battery
Once the key fob is open, you’ll see the battery compartment and the old battery.
- Note the orientation of the old battery (positive (+) and negative (-) sides). This is crucial for inserting the new battery correctly.
- Gently pry out the old battery. You can use your fingertip or the flathead screwdriver to carefully lift the edge of the battery and remove it from the compartment.
Step 3: Insert the New Battery
Now, take your new CR2025 or CR2032 battery.
- Install the new battery into the compartment, ensuring that the positive (+) side is facing the correct direction (matching the orientation you noted earlier). It should easily snap into place.
Step 4: Close the Key Fob
With the new battery securely in place, it’s time to 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 that the casing is completely closed and there are no gaps.
Step 5: Test Your Key
Finally, test your Mercedes-Benz key fob to ensure the battery replacement was successful.
- Press the lock, unlock, and panic buttons to verify they are working.
- If your Mercedes-Benz has keyless start, try starting your vehicle with the key fob.
If everything works as expected, you’ve successfully replaced your Mercedes-Benz key battery!
Choosing the Right Battery
It’s important to use the correct type of battery for your Mercedes-Benz key fob. Refer to your vehicle’s owner’s manual or examine the old battery to identify the exact battery type. Most commonly, Mercedes-Benz keys use CR2025 or CR2032 3V lithium batteries. These batteries are widely available at drugstores, supermarkets, and online retailers.
Replacing your Mercedes-Benz key battery is a simple DIY task that can save you inconvenience and money. By following these steps, you can ensure your key fob is powered up and working reliably.
