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Replacing the Battery in Your Mercedes Key Fob: A Step-by-Step Guid

by | Jan 1, 2025

Mercedes-Benz vehicles are known for their luxury and advanced technology, and their key fobs are no exception. However, like any electronic device, key fobs require occasional maintenance – primarily, a battery replacement. If your Mercedes key fob isn’t functioning as it should, a battery change may be all that’s needed. At TLC Mobile Auto Care, we’re here to guide you through the process of replacing your key fob battery so you can avoid the inconvenience of a non-responsive key.

Signs Your Mercedes Key Fob Battery Needs Replacing

Before diving into the steps, it’s essential to recognise the signs of a low battery in your Mercedes key fob. If you experience any of the following, it may be time for a battery change:

  • Reduced Range: You need to be closer to the vehicle for the key fob to work.
  • Intermittent Functionality: Sometimes, the key works, and other times it doesn’t.
  • Warning Light on Dashboard: Some Mercedes models have a dashboard alert indicating a low key battery.

If you’re experiencing any of these issues, it’s time to replace the battery.

What You’ll Need

Changing the battery in your Mercedes key fob is a quick and straightforward task that requires only a new battery and a small, flat tool (such as a screwdriver). Mercedes key fobs typically use CR2025 or CR2032 lithium coin batteries, but it’s always best to check your vehicle’s manual to confirm.

Step-by-Step Guide to Replacing the Battery

  1. Identify Your Key Fob Type: Mercedes-Benz has several types of key fobs. The steps here will apply to most models, but you may notice minor differences depending on the design of your fob.
  2. Release the Emergency Key: Start by removing the metal emergency key. This key is usually hidden within the fob and can be accessed by pressing a small button on the back.
  3. Open the Key Fob Casing: With the emergency key removed, locate the small slot where the key was stored. Insert your small, flat tool into this slot to gently pry open the key fob casing. Be careful not to apply too much force to avoid damaging the components.
  4. Remove the Old Battery: Once open, you’ll see the battery compartment. Use the same tool to lift out the old battery carefully.
  5. Insert the New Battery: Place the new battery in the compartment, ensuring the positive side is facing upwards, as indicated by the markings.
  6. Reassemble the Key Fob: Once the new battery is in place, snap the key fob casing back together and insert the emergency key.
  7. Test the Key Fob: Stand next to your vehicle and test the key fob’s functions to confirm the new battery is working.

Maintaining Your Key Fob

To extend the life of your new battery, avoid leaving the key fob in high-temperature areas, as heat can drain the battery. Additionally, if you’re not using your vehicle for an extended period, consider removing the battery from the key fob.

By following these steps, you can easily maintain your Mercedes key fob without needing a trip to the dealership. For more automotive tips and expert advice, don’t hesitate to reach out to TLC Mobile Auto Care.