How to Change Battery in Mercedes Benz Key Fob

A dead key fob battery can be a major inconvenience, leaving you stranded and unable to unlock your Mercedes Benz. Fortunately, changing the battery in your Mercedes key fob is a simple process that can be done in minutes. This guide will walk you through the steps to replace the battery, troubleshoot common issues, and get you back on the road quickly.

Mercedes Key Fob Battery Replacement

What You Need to Replace Your Mercedes Key Fob Battery

Before you get started, gather the following items:

• A new battery: Most Mercedes key fobs use a CR2025 or CR2032 3V lithium battery. You can find these at most hardware stores, auto parts stores, and online retailers.
• A small flathead screwdriver: This will be used to pry open the key fob.

How to Open a Mercedes Key Fob

Mercedes key fobs come in various designs. Here are the two most common methods to open them:

Method 1: Using the Key Release Button

1. Locate the key release button: This is usually a small button or switch on the side of the key fob.
2. Press the release button: While pressing the button, gently pull out the metal key from the key fob.
3. Identify the battery compartment: With the metal key removed, you should see a small slot or indentation that houses the battery.

Method 2: Using a Flathead Screwdriver

1. Locate the seam: Examine the key fob for a thin seam that runs around the edge. This indicates a removable cover.
2. Insert the screwdriver: Carefully wedge the flathead screwdriver into the seam.
3. Gently pry open the cover: Apply slight pressure to release the clips holding the cover in place. Avoid using excessive force to prevent damage.

Steps to Change the Battery in your Mercedes Key Fob

1. Open the key fob: Follow the appropriate method described above to access the battery compartment.
2. Remove the old battery: Note the orientation of the positive (+) and negative (-) sides of the battery. Carefully pry out the old battery using the screwdriver or your fingernail.
3. Insert the new battery: Place the new battery into the compartment, ensuring the positive (+) side faces the same direction as the old battery.
4. Reassemble the key fob: Align the cover and press it firmly back into place until you hear a click. If you used a screwdriver to open it, ensure the cover is securely fastened.
5. Test the key fob: Try locking and unlocking your car doors to ensure the new battery is working correctly.

Troubleshooting Tips

• Key fob still not working? Double-check that you have inserted the correct battery type and that it is properly positioned in the compartment.
• Key fob working intermittently? The battery contacts might be dirty or corroded. Gently clean them with a cotton swab and rubbing alcohol.
• Key fob completely dead? In rare cases, the key fob itself might be faulty and require replacement. Consult your local Mercedes Benz dealership or a qualified automotive locksmith.

Frequently Asked Questions

Q: How often should I change the battery in my Mercedes key fob?

A: Mercedes key fob batteries typically last between 3 to 5 years, depending on usage and environmental factors. It’s a good idea to replace the battery proactively before it completely dies.

Q: Can I change the Mercedes key fob battery myself, or do I need to go to a dealership?

A: Changing the battery is a simple DIY task that most car owners can do themselves.

Q: What type of battery does my Mercedes key fob use?

A: Most Mercedes key fobs use a CR2025 or CR2032 3V lithium battery. Consult your owner’s manual or look for markings on the old battery to confirm the correct type.

Q: Can I use any brand of battery for my Mercedes key fob?

A: While using a reputable brand is recommended, any brand of CR2025 or CR2032 battery with the correct voltage (3V) should work.

Q: My Mercedes key fob got wet. Will this damage the battery?

A: If your key fob gets wet, remove the battery immediately and allow it to dry completely before reinserting it or installing a new battery.

Need More Help?

For more information about Mercedes key fobs, including how to program new keys and troubleshooting other common problems, explore our website KEYFOBPROG. You can also find detailed guides on:

• How to open mercedes key fob 2003
• Batteries for a mercedes benz key fob
• What kind of battery goes in mercedes key fob
• How to change mercedes benz key fob
• How to replace mercedes key fob

Remember, a dead key fob battery can be a minor hiccup in your day. By following these simple steps, you can quickly replace the battery yourself and be on your way. However, if you encounter any difficulties or are unsure about any part of the process, don’t hesitate to contact a professional automotive locksmith or your local Mercedes-Benz dealership for assistance.