Changing the battery in your Mercedes key fob is a quick and easy process that can save you the hassle and expense of a trip to the dealership. If your key fob is acting up, like having reduced range or not working consistently, it’s likely time for a new battery. This guide will walk you through the steps, so you can get back on the road quickly. If you’re experiencing other car battery issues, check out this article on car battery not starting.
Identifying Your Mercedes Key Fob Type
Before you begin, you need to identify the type of key fob you have. Mercedes has used a variety of key fob designs over the years. Knowing your key fob type will help you locate the correct replacement battery and understand the specific steps to open your key fob without causing damage. The most common types are the chrome “flip” key, the newer, sleeker “smart key,” and the slightly older, plastic key fob.
Chrome “Flip” Key Battery Replacement
The chrome “flip” key is a popular design. To access the battery compartment, you’ll need a small flathead screwdriver. Insert the screwdriver into the small slot on the side of the key fob and gently pry open the casing. Inside, you’ll find the battery. Carefully remove the old battery and replace it with a new CR2025 battery, ensuring the positive (+) side is facing up. Finally, snap the key fob casing back together.
Replacing the Battery in a Mercedes Chrome Flip Key Fob
Smart Key Battery Replacement
The “smart key” is more sophisticated than the flip key. To change the battery in this type of key fob, you’ll first need to find the emergency key blade release. Press the release button and slide the key blade out. You can then use the key blade or a small flathead screwdriver to pry open the key fob at the designated notch. Inside, you’ll find the battery compartment. Replace the old battery (usually a CR2032) with a new one, making sure the positive (+) side is facing upwards. Reassemble the key fob by snapping the two halves back together and re-inserting the emergency key blade. If your car battery dies overnight, learn how to troubleshoot the problem with this guide: new car battery dead overnight.
Older Plastic Key Fob Battery Replacement
For older Mercedes models with plastic key fobs, the process might differ slightly. These fobs often have a small screw holding them together. You’ll need a small Phillips head screwdriver to remove this screw. Once the screw is removed, you can carefully separate the two halves of the key fob. Inside, you’ll find the battery, which is typically a CR2025 or CR2032. Replace the old battery with a new one, ensuring correct polarity. Then, reassemble the key fob by joining the two halves and tightening the screw.
Which Battery Do I Need for My Mercedes Key Fob?
Most Mercedes key fobs use either a CR2025 or CR2032 battery. You can usually find this information in your owner’s manual or by searching online for your specific Mercedes model and year. Having trouble starting your car? It might not be the key fob battery. Check this article for potential reasons: my car wont start but the battery is not dead.
What if My Key Fob Still Doesn’t Work?
If you’ve replaced the battery and your key fob is still not functioning correctly, there might be a more complex issue. It’s best to consult a qualified Mercedes technician for further diagnosis and repair. Is your car battery warning light on? Learn more about what that means here: battery warning light car. Another helpful resource to check out if you think your car battery might be failing is car battery going bad symptoms.
Conclusion
Changing the battery in your Mercedes key fob is a simple task that can be done in minutes with just a few tools. By following these steps, you can save yourself time and money. Remember to consult your owner’s manual for specific instructions related to your Mercedes model.
