10 Simple Steps to Replace Your Mercedes Benz Key Battery

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Replacing the battery in your Mercedes Benz key fob is a simple task that can be done in a few minutes. If your key fob is not working properly, or if the battery is weak, it is important to replace the battery as soon as possible.

There are two types of Mercedes Benz key fobs: those that use a traditional button battery, and those that use a rechargeable battery. The type of battery that your key fob uses will depend on the year and model of your Mercedes Benz.

To replace the battery in a key fob that uses a traditional button battery, you will need a small Phillips head screwdriver. First, remove the screw that is located on the back of the key fob. Once the screw is removed, you will be able to open the key fob and replace the battery.

How To Replace Mercedes Benz Key Battery

Step 1: Gather the Necessary Tools

You will need a small flathead screwdriver, a new CR2025 battery, and a soft cloth.

Step 2: Remove the Key Blade

Use the flathead screwdriver to gently pry open the small plastic cover on the back of the key fob. Once the cover is open, carefully remove the key blade.

Step 3: Open the Key Fob

Use the flathead screwdriver to carefully pry open the two halves of the key fob. Be careful not to damage the circuit board inside.

Step 4: Remove the Old Battery

Use the flathead screwdriver to gently pry out the old battery. Make sure to note the orientation of the battery so that you can insert the new one correctly.

Step 5: Insert the New Battery

Insert the new battery into the key fob, making sure that the positive (+) side is facing up. Press down on the battery until it clicks into place.

Step 6: Close the Key Fob

Align the two halves of the key fob and press them together until they snap shut. Replace the small plastic cover on the back of the key fob.

Step 7: Test the Key Fob

Press the lock or unlock button on the key fob to make sure that it is working properly.

Common Troubleshooting Tips

10. Key Fob Not Working After Replacing Battery

If your key fob is still not working after you have replaced the battery, there may be a few other issues that could be causing the problem. Here are some additional troubleshooting tips:

Check the battery again to make sure it is inserted correctly and that it is the correct type of battery.
Clean the battery contacts with a soft cloth to remove any dirt or debris.
Try resetting the key fob by holding down the lock and unlock buttons simultaneously for 10 seconds.
If the key fob is still not working, it may need to be reprogrammed. You can do this at a Mercedes-Benz dealership or by using a locksmith.

How to Replace Mercedes Benz Key Battery

Replacing the battery in your Mercedes Benz key fob is a quick and easy process that can be done in just a few minutes. Here are the steps on how to do it:

Locate the small screw on the back of the key fob and use a small screwdriver to remove it.
Carefully pry open the two halves of the key fob.
Locate the battery inside the key fob and remove it using a small screwdriver or your fingers.
Replace the old battery with a new one of the same type.
Close the two halves of the key fob and tighten the screw.

If you have a keyless entry Mercedes Benz, you may need to reprogram the key after replacing the battery. To do this, simply insert the key into the ignition and turn it to the “on” position. Then, press and hold the lock button on the key fob for about 10 seconds. The key fob will beep once to indicate that it has been reprogrammed.