How To Change Mercedes Benz Key Battery? (The Easiest Method)

Have you ever found yourself standing in the parking lot, desperately trying to unlock your Mercedes Benz with a key that just won’t work? You’re not alone.

Luckily, changing the battery in your Mercedes Benz key is actually a simple and straightforward process that anyone can do.

In this article, we will walk you through the easiest method of changing the battery in your Mercedes Benz key.

So, if you’re ready to get your key working again, read on to learn more.

How To Change Mercedes Benz Key Battery?

Changing the battery in your Mercedes Benz key fob can be a straightforward process, as long as you have the right tools and know-how.

Most Mercedes Benz vehicles use a CR2032 lithium-ion battery.

You will need a flathead screwdriver, a Phillips head screwdriver, and a pair of needle nose pliers to complete the task.

Locate the key fob, which is usually found in the center console or glovebox of your car.

Use the flathead screwdriver to pry open the back cover.

This cover may be secured with a single screw, so make sure to remove it prior to prying it off.

You will then be able to see the battery and its connections.

Use the Phillips head screwdriver to remove the screws that hold the battery in place.

With the screws removed, use the needle nose pliers to carefully remove the battery from the key fob.

After taking out the old battery, insert the new one, making sure that the positive and negative connections are properly aligned.

Re-attach the screws, put the back cover back in place, and close it.

With the new battery installed, you should now be able to use your Mercedes Benz key fob again.

If you are still having any issues, contact your local Mercedes Benz dealership for assistance.

How Can I Change The Mercedes Key Battery?

Changing the battery in your Mercedes key is a relatively simple process.

First, identify the type of key you have, as it typically uses either a CR2032 or a CR2016 battery.

Locate the release button on the side of the key it may be flush or slightly raised.

Press the button and open the key.

You may need to remove a small screw to take out the old battery.

Once the battery is out, slide the new one in with the positive side facing up.

Make sure the battery is inserted correctly, as an incorrect insertion may cause the key not to work.

Once done, close the key and test it.

If your Mercedes key does not have a release button, you will need to take it apart with a small flathead screwdriver.

Then, follow the same steps as above to change the battery.

With the right tools and a bit of patience, you can change the battery in your key in just a few minutes.

What Battery Do I Need For A Mercedes Key Fob?

If you need to power your Mercedes key fob, the type of battery you need depends on the model.

Most Mercedes key fobs use a CR2032 lithium coin cell battery.

This is a 3V battery that is small and round, measuring 20 mm in diameter and 3.

2 mm in height.

However, if you have a newer model Mercedes, like the C Class, E Class, or S Class, you may need a different type of battery such as a CR2025 or CR2016.

To make sure you get the right battery, you can refer to your owners manual or look it up online.

It’s important to use the right battery to avoid damaging your fob and car.

In addition to getting the right battery, it’s also important to replace the battery in your key fob regularly.

This will ensure that your key fob and car are always ready to go.

When replacing the battery, make sure to use a lithium coin cell battery, as other types of batteries may not work.

If you’re not sure, contact your local Mercedes dealer for help.

Can I Change Mercedes Battery By Myself?

Changing a Mercedes battery yourself is possible, but not recommended.

Mercedes vehicles are equipped with complex electrical systems and components that require specialized knowledge and tools to be diagnosed and serviced correctly.

Even though it is possible to replace a Mercedes battery without the right knowledge and tools, it is not advised.

If you do decide to change the battery yourself, make sure you are familiar with the specific model of your Mercedes and understand how to properly disconnect and reconnect the battery.

It is also essential to use the correct type of battery and that it is appropriately charged.

Your best option is to have a professional mechanic change the battery for you.

This will guarantee the job is done accurately without any damage to your vehicle.

The mechanic can also diagnose any other electrical problems that might exist in the vehicle.

In conclusion, while you can change a Mercedes battery yourself, it is not recommended.

It is best to have a professional mechanic change the battery for you.

What To Do If Mercedes Key Battery Dies?

If your Mercedes key battery has died, you’ll need to replace the battery.

Most Mercedes keys use a standard CR2032 battery, which is easy to find at most convenience stores or hardware stores.

To replace the battery, carefully open the key and remove the old battery.

Then, insert the new battery with the positive side facing up.

You may need to use a small screwdriver to get the battery in correctly.

Once reassembled, test the key to ensure it’s working properly.

If the battery died due to a malfunction, you may need to have the key serviced or replaced by a professional.

Remember, Mercedes keys are programmed to work with a specific vehicle, so it’s important to make sure it’s programmed correctly.

If you don’t have a spare key, you may be able to borrow one from a friend or family member.

Alternatively, you can always use a spare key if you have one while you take care of the other issue.

How Do You Change The Battery In A 2017 Mercedes Key?

Changing the battery in a 2017 Mercedes key is not difficult and can be done with the right tools and a bit of know-how.

You will need to purchase a new battery (CR 2032 type) and a small screwdriver.

First, you will need to identify which key you have. The 2017 Mercedes key has three different types: the traditional Smart Key with a metal blade at the end; the Comfort Access Key; and the Keyless Go Key, which are both fobs without blades.

If you have a Smart Key, locate the small hole on the side of the metal blade and insert a screwdriver into it.

Gently wiggle the screwdriver until you can open the metal side of the key, then take out the old battery and replace it with the new one.

Make sure the battery is correctly installed and the metal side is closed tightly.

For a Comfort Access Key or a Keyless Go Key, locate the small slot on the back and insert a small flathead screwdriver into it.

Gently pry open the back cover, take out the old battery, and replace it with the new one.

Make sure the battery is correctly installed and the back cover is closed tightly.

Once the battery is replaced, you will need to reprogram the key.

Instructions for this can be found in your owner’s manual.

With the right tools and know-how, you should be able to replace the battery in your key and get back on the road in no time.

Can I Change My Key Battery Myself?

Yes, you can replace your key battery yourself easily.

But, it is essential to make sure that you are using the correct type of battery and that it is installed correctly.

This process is simple and typically does not require any special tools.

Before you start, it is important to check the owner’s manual to ensure that you have the correct battery.

To open the key, use a small flat-head screwdriver and carefully pry it open without damaging it.

The battery is usually located at the back of the key and connected to the circuit board with two metal terminals.

Carefully disconnect the terminals from the battery and remove the old one.

Now, insert the new battery and make sure that the terminals are connected properly.

Make sure the battery is in the right orientation and that the terminals are making good contact with the circuit board.

Then, reassemble the key and test it to make sure that the battery is working.

In general, it is safe to replace your key battery yourself.

But, if you are uncertain or if the key is damaged in any way, it is best to have it serviced by a professional.

How Often Do You Need To Replace The Battery In A Mercedes Key?

Replacing the battery in a Mercedes key can vary based on the model and year of the car.

Generally, it is recommended to replace the battery every two to three years.

However, if your car is equipped with a keyless entry system, the battery may last up to five years.

To check the battery in your Mercedes key, use a voltmeter to measure the voltage.

If it is lower than 3.

5 volts, it is time for a replacement.

When replacing the battery, make sure to use the correct type for your car model and year.

Some Mercedes keys require a special type of battery which can only be purchased from a Mercedes dealership.

To ensure the battery’s longevity, avoid exposing it to extreme temperatures and moisture, and try to avoid dropping the key.

Can I Use Cr2032 Instead Of Cr2025 In Mercedes Key?

Can you use a CR2032 instead of a CR2025 in a Mercedes key? The answer is yes, but there are a few things to keep in mind.

The CR2032 and CR2025 batteries are very similar in size, shape, and voltage, so it is possible to use the former as a replacement for the latter.

However, the CR2032 battery is slightly thicker, so it may not fit in the same space as the original battery.

If the battery is too thick to fit in the key, it won’t work, and you’ll need to find a thinner battery.

Also, the CR2032 has a slightly higher capacity than the CR2025, meaning it will last longer, but it could potentially draw more power than the CR2025.

This could be a problem for some Mercedes keys, as overloading the power system could cause damage.

Lastly, consider the cost of the two batteries.

CR2025 batteries are generally cheaper than CR2032 batteries, so you may want to factor that into your decision.

In summary, it is possible to use a CR2032 instead of a CR2025 in a Mercedes key, but there are some things to consider first.

Make sure that the thicker battery will fit in the key and that the higher capacity won’t overload the power system.

Additionally, consider the cost of the replacement battery to ensure it is the most cost-effective option.

How Do I Know If My Mercedes Key Battery Is Low?

Knowing when your Mercedes key battery is running low is essential for keeping your vehicle running smoothly.

There are a few easy ways to tell if your key battery has started to run low.

First, take a look at the red LED light on the key itself.

If the LED light is flashing, the key battery is low and needs to be replaced.

If the LED light isn’t working at all, the battery has likely already run out and must be replaced.

Second, check your car’s dashboard.

Most Mercedes models have a dashboard indicator that will alert you when the key battery is running low.

If you see a warning light or message, it’s time to replace your key battery.

Finally, if your key isn’t working properly, it’s likely that the battery is running low.

If the key won’t unlock the doors or start the car, the battery needs to be replaced.

If you’ve already tried replacing the battery, the key itself may need to be serviced or replaced.

By paying attention to the LED light, your dashboard indicator, and the performance of your key, you can easily tell if your key battery is running low and when it needs to be replaced.

How Do I Know If My Mercedes Key Needs A New Battery?

If you think your Mercedes key needs a new battery, there are several signs to watch out for.

Check if the key fob is still able to lock or unlock your car from a distance.

If not, or if it’s responding intermittently, it’s likely due to a drained battery.

When you press the buttons, does it light up as usual? If not, or if it’s taking longer than usual to start the car, it could be a sign that the battery needs to be changed.

Additionally, if your key isn’t able to hold a charge for long and needs to be recharged often, it is likely time for a replacement.

Finally, check the expiration date on the battery.

If it’s out of date, you should replace it.

When you have determined that the key needs a new battery, it’s best to have it replaced by a trusted Mercedes technician.

They have the correct tools and know-how for the job, and can provide the correct type of battery for your model.

Final Thoughts

Changing the battery in your Mercedes Benz key is a breeze, especially when you know the right steps.

By following this guide, you’ve now learned the easiest method for changing your Mercedes Benz key battery.

So, if you ever find yourself in the situation where your key is no longer working, you’ll know exactly what to do.

Get out those tools, and get your key working again!


James is an experienced software developer who loves to write about cars in his spare time. He has been a passionate car enthusiast since he was a child and has always dreamed of one day owning his own car.He has an extensive knowledge of the automotive industry, from classic cars to the latest technology, and loves to share his passion with others.

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