How to Change Mercedes Key Battery 2020: A Step-by-Step Guide for Hassle-Free Replacement

Have you ever found yourself stranded outside your Mercedes, fumbling with a key that just won’t unlock the door? It’s a frustrating moment that many drivers face when their key battery dies. But don’t worry; changing the battery in your 2020 Mercedes key is a quick and easy fix that you can handle yourself.

Key Takeaways

• Know Your Key Fob Type: Identify whether your 2020 Mercedes key fob is a Smart Key or Keyless Go Key to choose the correct replacement battery.
• Battery Specifications: The common batteries for 2020 Mercedes key fobs are CR 2025 and CR 2032, both lasting about 2 to 3 years.
• Essential Tools: Gather a flathead screwdriver, tweezers, a soft cloth, and the appropriate replacement battery for an easier replacement process.
• Step-by-Step Process: Follow a clear sequence to open the key fob, remove the old battery, insert the new one, and close the fob securely to ensure functionality.
• Troubleshoot Common Issues: If the fob doesn’t work after replacing the battery, verify battery orientation, type, and check for contact issues.
• Enhance Battery Longevity: Avoid extreme temperatures, minimize unnecessary button usage, and conduct regular battery checks to extend battery life.

Overview of Mercedes Key Battery Types

Understanding the different types of batteries used in your 2020 Mercedes key fob can make replacing them easier. Mercedes key fobs typically have two battery types depending on the model.

Key Fob Models for 2020

Various models of Mercedes key fobs exist, and each may use a different battery type. Common models include:

• Smart Key: This is the most frequently used key fob in 2020 Mercedes vehicles, featuring a metallic finish and several buttons.
• Keyless Go Key: This type offers a push-button start feature, enhancing convenience.

Knowing your specific key fob model helps ensure you select the correct battery for replacement.

Battery Specifications

The most common battery type for 2020 Mercedes key fobs is the CR 2025 or CR 2032 lithium coin cell. These batteries provide reliable power and last an average of 2 to 3 years. Here are some details:

Battery Type	Dimensions (mm)	Average Lifespan
CR 2025	20 x 2.5	2 to 3 years
CR 2032	20 x 3.2	2 to 3 years

Make sure to check your key fob to confirm the exact battery type before purchasing a replacement.

Tools Required for the Battery Replacement

Changing the battery in your 2020 Mercedes key fob requires just a few essential tools. Having these ready makes the process smooth and straightforward.

Recommended Tools

• Flathead Screwdriver: Use this to gently pry open the key fob. A small, thin screwdriver works best for avoiding damage.
• Replacement Battery: Choose the correct type based on your key fob model. Common options include the CR 2025 and CR 2032 lithium coin cells.
• Tweezers: These can help you handle small components during the battery replacement.
• Soft Cloth: This protects surfaces and prevents scratches on your key fob during the process.

• Work in a Well-Lit Area: Ensure you can see all parts clearly to avoid losing small components.
• Avoid Using Excessive Force: When prying open the key fob, use gentle pressure to prevent breakage.
• Keep Small Parts Together: Place screws and the old battery in a safe spot as you work. This avoids misplacing them.
• Dispose of Old Batteries Properly: Follow local regulations for battery disposal to be environmentally responsible.

Step-by-Step Guide to Changing the Key Battery

Changing the battery in your 2020 Mercedes key is straightforward. Below are the detailed steps to ensure a smooth process.

Preparing the Key Fob

1. Gather Tools: Collect a flathead screwdriver, the correct replacement battery (CR 2025 or CR 2032), tweezers, and a soft cloth.
2. Choose a Workspace: Find a clean, well-lit area to work. A suitable surface prevents losing small parts during the process.

Removing the Old Battery

1. Open the Key Fob: Use the flathead screwdriver to gently pry open the key fob. Insert the screwdriver between the two halves and twist slightly to create a gap.
2. Locate the Battery Compartment: Once the key fob is open, identify the battery compartment. Be careful not to damage any internal components.
3. Take Out the Old Battery: Using tweezers, carefully remove the old battery from its slot. Dispose of the battery according to local regulations.

Installing the New Battery

1. Identify Battery Orientation: Check the battery slot for markings indicating positive (+) and negative (−) sides. Insert the new battery in the correct orientation.
2. Secure the Battery: Press down gently on the new battery until it fits snugly into the compartment.

1. Align the Halves: Bring the two halves of the key fob together, ensuring that they align correctly.
2. Snap the Key Fob Closed: Press firmly but gently around the edges until you hear a click, indicating the fob has closed securely.
3. Test the Key Fob: Press any button to verify that the key fob is functioning properly.

With these steps, you can easily change the battery in your 2020 Mercedes key fob.

Common Issues and Troubleshooting

You might encounter a few common issues when replacing the battery in your 2020 Mercedes key fob. Troubleshooting these problems can save time and hassle.

Key Fob Not Working After Battery Change

If your key fob doesn’t work after you replace the battery, check the following:

• Battery Orientation: Ensure the new battery is installed correctly. The positive side should face upward in most models.
• Battery Type: Confirm you used the right battery type, either CR 2025 or CR 2032, depending on your key fob model.
• Contact Issues: Inspect the battery contacts for dirt or corrosion. Clean them gently with a soft cloth.
• Replacement Damage: Check for any damage to the key fob during the battery replacement. Ensure all parts are properly secured.

If issues persist, a visit to a dealership may help.

Tips for Battery Longevity

Maintaining your key fob battery’s lifespan can prevent frequent replacements. Consider these tips:

• Avoid Extreme Temperatures: Keep your key fob away from heat and moisture. Extreme conditions can drain the battery faster.
• Minimize Button Usage: Try not to press the buttons unnecessarily, as this activates the battery.
• Regular Checks: Replace the battery every 2 years or sooner if you notice reduced range or performance.
• Store Properly: If you won’t use your key fob for an extended period, store it in a protective case to minimize wear.

These practices can help you extend the life of your key fob battery and avoid unexpected lockouts.

Conclusion

Changing the battery in your 2020 Mercedes key fob is a straightforward task that you can easily tackle at home. With the right tools and a little patience you can get back to enjoying the convenience of your key fob in no time.

Remember to double-check the battery type and follow the steps carefully to ensure everything goes smoothly. By taking good care of your key fob and being proactive about battery changes you can avoid those frustrating lockout situations.

Happy driving and keep that key fob in top shape!

Frequently Asked Questions

What types of batteries are used in 2020 Mercedes key fobs?

Most 2020 Mercedes key fobs use either the CR 2025 or CR 2032 lithium coin cell batteries. It’s essential to check your specific key fob model to confirm the correct battery type before purchasing a replacement.

How often should I replace my key fob battery?

Key fob batteries for 2020 Mercedes models typically last between 2 to 3 years. However, it’s a good practice to check the battery periodically and replace it before it dies to avoid being locked out.

What tools do I need to change the key fob battery?

To replace a key fob battery, you’ll need a flathead screwdriver, the correct replacement battery (CR 2025 or CR 2032), tweezers, and a soft cloth. These tools will help you manage the replacement process smoothly.

How do I change the battery in my Mercedes key fob?

Start by gathering your tools and finding a well-lit workspace. Use the flathead screwdriver to carefully pry open the key fob, remove the old battery, insert the new one with the correct orientation, and snap it closed. Test it afterward to ensure it works.

What should I do if my key fob doesn’t work after a battery change?

If your key fob isn’t working after replacing the battery, check the battery orientation, confirm you used the correct battery type, inspect for dirt or corrosion on battery contacts, and ensure no damage occurred during the process.

How can I extend my key fob battery’s lifespan?

To extend your key fob battery’s lifespan, avoid extreme temperatures, minimize unnecessary button presses, perform regular checks, and store the key fob properly when not in use. These practices can help prevent unexpected lockouts.

Can I dispose of the old battery in regular trash?

No, you should not dispose of old key fob batteries in regular trash. Instead, check local regulations for proper disposal methods or take them to a recycling center that accepts batteries to protect the environment.