How to Change Battery on Mercedes Key Fob

Have a dead battery in your Mercedes key fob? Don’t panic! This is a common issue, and thankfully, changing the battery on a Mercedes key fob is a quick and easy process that you can often do yourself at home. This guide will walk you through the steps, offering tips and insights to make the process seamless.

Identifying Your Mercedes Key Fob Type

Before you begin, you’ll need to determine which type of Mercedes key fob you have. Mercedes has introduced various key fob designs over the years, and each may have slight variations in the battery replacement procedure.

Generally, you’ll encounter one of two main types:

• Chrome Key Fob: This classic design often features a visible metal key that slides out from the side.
• SmartKey or Keyless-Go: These newer fobs are sleeker and may not have a visible metal key.

Once you’ve identified your key fob type, gather the necessary tools.

What You’ll Need:

• A small flat-head screwdriver
• A new CR2025 or CR2032 battery (check your owner’s manual or the existing battery for the correct type)

Steps to Change the Battery in Your Mercedes Key Fob

Chrome Key Fob Battery Replacement

1. Locate the Release Button: On the back of your key fob, find the small, round release button.
2. Release the Metal Key: Press the release button and gently slide the metal key out of the fob.
3. Open the Key Fob: With the metal key removed, you should see a small slot. Insert the flat-head screwdriver into this slot and gently pry open the key fob casing. Be careful not to use excessive force.
4. Replace the Battery: Inside the fob, you’ll find the battery. Carefully remove the old battery and replace it with the new one, ensuring the positive (+) side is facing up.
5. Reassemble the Fob: Align the two halves of the key fob and press them firmly together until you hear a click, indicating it’s securely closed.
6. Reinsert the Metal Key: Slide the metal key back into its slot on the fob.

SmartKey or Keyless-Go Fob Battery Replacement

1. Locate the Emergency Key Slot: On the bottom of your key fob, find a small slot.
2. Release the Emergency Key: Insert the flat-head screwdriver into the slot and gently pry open the small cover to reveal the emergency key. Remove the key.
3. Open the Key Fob: Use the emergency key or the flat-head screwdriver to pry open the fob casing at the seam. Again, be gentle to avoid damaging the fob.
4. Replace the Battery: Inside, you’ll find the battery. Remove the old battery and replace it with the new one, making sure the positive (+) side faces up.
5. Reassemble the Fob: Carefully align the fob halves and press firmly until they click back into place.
6. Reinsert the Emergency Key: Slide the emergency key back into its slot.

Testing Your New Key Fob Battery

Once you’ve replaced the battery, test the key fob by pressing its buttons. The car should respond. If the fob still doesn’t work, try repeating the steps, ensuring the new battery is properly installed and that the contacts inside the fob are clean.

Still Having Trouble?

While replacing the battery in your Mercedes key fob is generally straightforward, there are instances where you might encounter difficulties or require additional assistance.

“It’s crucial to ensure you have the correct battery type and that it’s properly seated within the key fob,” says master automotive technician, John Davis. “If you’re unsure or uncomfortable performing these steps, it’s always best to consult your owner’s manual or seek assistance from a qualified Mercedes-Benz technician.”

Additional Tips

• Handle the Battery with Care: Avoid touching the flat surfaces of the new battery, as this can reduce its lifespan.
• Don’t Force It: If the fob is difficult to open or close, double-check your alignment and avoid using excessive force, which could damage the fob.
• Consider a Spare: Key fob batteries typically last 3-4 years. Keep a spare CR2025 or CR2032 battery on hand to avoid any inconvenience.

By following these simple steps, you can easily change the battery on your Mercedes key fob and get back on the road!

For more detailed information about your specific Mercedes model, check out our guide on the 2017 Mercedes-Benz GLA 250 key fob. Need to reset your key fob entirely? We’ve got you covered with our step-by-step instructions on how to reset key fob Mercedes.

FAQs

1. How often should I change my Mercedes key fob battery?
Mercedes key fob batteries typically last between 3 to 4 years, depending on usage.

2. Can I use any brand of CR2025 or CR2032 battery?
While it’s recommended to use reputable brands, any brand of CR2025 or CR2032 battery with the correct voltage should work.

3. What if my key fob still doesn’t work after changing the battery?
Double-check that the new battery is installed correctly and that the metal contacts inside the fob are clean. If the issue persists, there might be a problem with the fob itself, and it’s best to consult a Mercedes-Benz dealer.

4. Can I program a new key fob myself?
Programming a new Mercedes key fob often requires specialized equipment and procedures. It’s generally recommended to have this done by a qualified Mercedes-Benz technician.

5. How much does it cost to replace a Mercedes key fob?
The cost of replacing a Mercedes key fob can vary depending on the model and year of your vehicle. It’s best to contact a Mercedes-Benz dealer for an accurate price estimate.

Need help with your car Key Fob? Contact us via WhatsApp: +1(641)206-8880, Email: [email protected]. Our team is available 24/7 to assist you.