Are you wondering what size battery for Mercedes key fob needs? Knowing the correct battery size is crucial to ensure your key fob is always ready to unlock your car, pop the trunk, or even start the engine.
However, choosing the wrong battery can lead to poor performance or even damage.
This blog post will guide you through the process of determining the correct battery size for various Mercedes models, exploring different types of suitable batteries, and providing a guide on how to replace the battery in your Mercedes key fob.
Let’s dive in!
What Size Battery for the Mercedes Key Fob?
The Mercedes key fob uses a CR2025 or CR2032 battery, which are coin cell batteries. It’s crucial to refer to the vehicle’s manual or consult the dealership to confirm the correct battery size for the specific model to ensure proper fit and operation.
Mercedes Key Fob Battery Size Chart:
| Mercedes Model | Year | Battery Size |
| General | – | CR2025 or CR2032 |
| Mercedes-Benz (2016-18 or later) | 2016+ | CR2032 |
| Mercedes GLC 300 key | – | CR2025 |
| Ml350 key fob battery | – | CR2032 |
Suitable Batteries for Mercedes Key Fob
Lithium Batteries
Lithium batteries, specifically the CR2025 and CR2032 models, are the most commonly used in Mercedes key fobs. They provide a stable voltage output and have a long shelf life, making them an excellent choice for key fobs.
These batteries are also compact, fitting perfectly within the key fob’s small compartment. The only drawback is that they can be slightly more expensive than other types of batteries.
Alkaline Batteries
Alkaline batteries are not commonly used in Mercedes key fobs. Their larger size and lower voltage output make them less suitable for this purpose.
However, they are widely available and inexpensive, which might make them a tempting choice.
But remember, the key fob might not function optimally with these batteries due to their lower power output.
Silver Oxide Batteries
Silver oxide batteries are not typically used in key fobs as they have a lower voltage output compared to lithium batteries.
While they are known for their long-lasting power in small devices like watches, their lower voltage makes them less suitable for a device like a key fob that requires a higher power output.
Rechargeable Batteries
Rechargeable batteries could seem like an eco-friendly choice, but they’re not typically used in key fobs. Their larger size can make them difficult to fit into the compact design of a key fob.
Additionally, the need for regular recharging can be inconvenient for users. It’s also important to note that not all rechargeable batteries maintain a consistent voltage when their charge starts to run low, which could affect the performance of your key fob.
Identifying the Correct Battery Size for Mercedes Key Fob
Examine the Key Fob
The first step in identifying the correct battery size for your Mercedes key fob is to examine the key fob itself. Often, the battery type is indicated on the key fob.
If not, you can open the key fob to check the existing battery. For example, if you have a 2017 Mercedes-Benz E-Class, you might find a CR2025 battery inside.
Refer to the User Manual
The user manual of your vehicle is a treasure trove of information. It will provide specific details about the correct battery size for your key fob.
So, if you have a 2018 Mercedes-Benz C-Class, your user manual will specify that you need a CR2032 battery for your key fob.
Conduct Online Research
In today’s digital age, a quick online search can provide a wealth of information. You can search online using your vehicle’s model and year to find out the correct battery size.
For instance, if you own a 2019 Mercedes-Benz GLC 300, an online search will reveal that it uses a CR2025 battery.
Contact a Mercedes Dealership
If you’re still unsure about the correct battery size after examining your key fob, referring to your user manual, and conducting online research, don’t worry! You can contact a Mercedes dealership.
They have access to detailed databases and can provide accurate information based on your vehicle’s specifications.
So whether you drive a 2020 Mercedes-Benz S-Class or a 2021 Mercedes-Benz GLE 350, they’ll be able to tell you whether you need a CR2025 or CR2032 battery.
Changing the Battery in a Mercedes Key Fob: A Step-by-Step Guide
Tools Needed
To change the battery in your Mercedes key fob, you’ll need a new battery (either a CR2025 or CR2032, depending on your model) and possibly a small screwdriver. These are the basic tools required for this task.
Accessing the Battery Compartment
The first step is to access the battery compartment. To do this, remove the spare metal key from the key fob. You’ll notice a visible slot at the end of the key fob. Press the metal key into this slot to open the battery compartment.
Removing the Old Battery
Once you’ve opened the compartment, it’s time to remove the old battery. Be careful during this step as you don’t want to damage any internal components of the key fob. Gently lift out the old battery and set it aside.
Installing the New Battery
Now, you’re ready to install your new battery. Place your new battery into the compartment, making sure that it’s facing in the correct direction. The positive side (usually marked with a “+”) should be facing up.
Testing the Key Fob
After replacing and closing up your key fob, it’s important to test it with your vehicle to ensure it’s working properly. Try locking and unlocking your car doors using the key fob.
If everything works as expected, congratulations! You’ve successfully changed the battery in your Mercedes key fob.
Factors Influencing Battery Selection for Mercedes Key Fob
Voltage Requirements
The voltage requirement of your key fob is a crucial factor in determining the correct battery.
Mercedes key fobs typically require a CR2025 or CR2032 battery, both of which provide a 3-volt output. It’s essential to use the correct voltage to ensure your key fob functions properly.
Battery Longevity
Battery longevity is another important consideration. Lithium batteries like CR2025 and CR2032 are known for their long shelf life, making them ideal for use in key fobs.
Using a battery with a long shelf life ensures that your key fob remains operational for an extended period.
Brand Considerations
While there are many brands available, it’s recommended to choose a reputable brand known for quality and reliability.
A high-quality battery will provide consistent performance and reduce the risk of damage to your key fob.
Price and Availability
Finally, price and availability can influence your battery selection. CR2025 and CR2032 batteries are commonly available at various price points. You can purchase them from local stores or online markets.
However, while it might be tempting to opt for the cheapest option, remember that quality and reliability are crucial for the optimal functioning of your key fob.
Mercedes Key Fob Battery Maintenance and Troubleshooting
Regular Checkups
Just like you would with your car, it’s important to regularly check your key fob’s functionality to ensure it’s working properly.
If you notice any issues, such as the key fob not responding or the range decreasing, it may be time to replace the battery.
Cleaning the Contacts
Over time, contacts within your key fob can become dirty or corroded. This can affect the performance of your key fob.
Cleaning them carefully with a soft cloth can help improve functionality. Remember, it’s important to be gentle to avoid causing any damage.
Troubleshooting Common Issues
If your key fob isn’t working even after replacing the battery, there may be other issues at play. It could be a problem with the key fob itself or the car’s receiver.
Consult your vehicle’s manual for troubleshooting tips. You can also try resetting the key fob or reprogramming it, as outlined in the manual.
When to Seek Professional Help
If you’re unable to resolve the issue yourself, it may be time to seek help from a professional. This could be a local mechanic or a Mercedes dealership. They have specialized tools and knowledge to diagnose and fix the problem.
Remember, it’s better to seek professional help than risk causing further damage by trying to fix something you’re unsure about.
FAQs
Can I use a battery other than CR2025 or CR2032 for my Mercedes key fob?
No, it’s recommended to use only CR2025 or CR2032 batteries for proper functionality and fit.
Are alkaline batteries suitable for Mercedes key fobs?
No, alkaline batteries are not recommended due to their larger size and lower voltage output.
Do all Mercedes key fobs use the same size battery?
No, different models may use different batteries; consulting the manual or a dealership is advised.
Does the positive side of the battery face upwards when inserting?
Yes, the positive side, usually marked with a “+,” should face upwards.
Are rechargeable batteries recommended for keyfobs?
No, rechargeable batteries are not typically recommended due to size constraints and inconsistent voltage issues.
Conclusion
Understanding your Mercedes key fob battery is crucial for maintaining its functionality.
Whether it’s knowing the correct battery size, how to replace it, or how to troubleshoot issues, this knowledge can save you time and prevent potential inconveniences.
Always remember to choose high-quality batteries and seek professional help if needed.
