What Battery Does A Key Fob Take

Have you ever found yourself stranded outside your car, unable to start it because your key fob battery died? It’s a frustrating experience that can be easily avoided if you know what type of battery your key fob takes.

Key fobs have become an essential part of modern car technology. They allow us to lock and unlock our cars, start the engine remotely, and even open the trunk or tailgate.

However, like any other electronic device, key fobs require a power source to function. Knowing what battery your key fob takes can save you time, money, and frustration.

In this article, we’ll take a closer look at the different types of key fob batteries and how to replace them. Whether you’re a car owner or just curious about the technology behind key fobs, this article will provide you with the information you need to keep your key fob powered up and ready to go.

What is a key fob?

A key fob is a small device that is used to control various functions of a vehicle or other electronic device. It typically contains a small computer chip that communicates with the device it is paired with, allowing for remote control of functions like unlocking doors, starting the engine, or setting an alarm.

Key fobs are commonly used in cars, but can also be found in other applications such as garage door openers, security systems, and even some home appliances.

They are typically designed to be easy to use and convenient, allowing users to access their devices quickly and easily. 

Importance of key fob

Key fobs are small, electronic devices that are designed to control the locking and unlocking of a car’s doors. They are essential for modern car owners because they make it easy to get in and out of the vehicle without having to fumble for keys.

Key fobs also have other features, such as remote start, that can make driving more convenient and comfortable. Additionally, key fobs are an important security feature, as they use encryption to prevent unauthorized access to the vehicle.

Overall, key fobs are an important tool for any car owner, as they enable easy access to the vehicle and provide added security.

Understanding the different types of key fobs

car key
Image Credit: batteriesplus.com

Basic Key Fobs

Basic key fobs are the most common type of key fob. They usually have a single button that unlocks and locks the car. They are simple to use and affordable, but lack advanced features like remote start or trunk release.

Remote Start Key Fobs

Remote start key fobs enable you to start your car from a distance. This is especially beneficial during cold weather, as you can warm up your car before entering it.

Some remote start key fobs also have the ability to control the car’s climate control system.

Transponder Key Fobs

Transponder key fobs have a chip embedded in them that communicates with the car’s immobilizer system. This system prevents the car from starting unless the correct key fob is present.

These key fobs are more secure than basic key fobs but are also more expensive to replace.

Smart Key Fobs

Smart key fobs are the most advanced type of key fob. They use radio frequency identification (RFID) technology to communicate with the car.

These key fobs can do everything from unlocking the car to starting it, and even opening the trunk. They are also equipped with a push-button start feature, eliminating the need for a physical key.

Flip Key Fobs

Flip key fobs have a key blade that flips out of the fob when needed. This design makes them more compact and easier to carry, while still providing the same functionality as other key fobs.

Valet Key Fobs

Valet key fobs are designed for use by valet drivers. They have limited functionality, only allowing access to the car’s doors and ignition. This ensures that the valet driver cannot access the trunk or any personal belongings left in the car.

Aftermarket Key Fobs

Aftermarket key fobs are designed to replace lost or damaged key fobs. They are often cheaper than OEM key fobs, but may not have all the same features or be as reliable.

It is important to ensure that the aftermarket key fob is compatible with your car before purchasing.

How to determine the type of battery your key fob takes?

Check the owner’s manual

The easiest and most reliable way to determine the type of battery your key fob takes is to check the owner’s manual. The manual should have all the information you need, including the battery type and size.

Look at the battery

If you have access to the battery, you can check the type and size directly. Most key fob batteries have the type and size printed on the battery itself.

If you can’t find it, try removing the battery and taking it to a store that sells batteries. They should be able to identify the type and size for you.

Check the manufacturer’s website

If you don’t have the owner’s manual or can’t find the battery type and size on the battery, try checking the manufacturer’s website.

They may have a section on their website that lists the type and size of batteries used in their key fobs.

Use an online battery finder

If you’re still having trouble identifying the type of battery your key fob takes, try using an online battery finder.

These tools allow you to search for the battery type and size based on the make and model of your key fob.

Ask a professional

If all else fails, you can always ask a professional. Take your key fob to a dealership or locksmith and ask them to identify the battery type and size for you. They should be able to help you quickly and easily.

Common types of batteries used in key fobs

Key fobs are small devices that allow you to remotely lock and unlock your car doors, start your engine, and perform other functions. They are powered by small batteries that are designed to last for a long time.

The most common types of batteries used in key fobs are lithium coin cell batteries, also known as button cell batteries. These batteries are small, lightweight, and have a long life span.

Other types of batteries that may be used include alkaline and silver oxide batteries. It’s important to choose the right type of battery for your key fob to ensure that it works properly and lasts as long as possible.

How to replace the battery in your key fob

If you are experiencing issues with your key fob, it may be time to replace the battery. First, determine the type of battery your key fob requires. Then, locate the battery compartment on the back of the fob and use a small screwdriver to open it.

Remove the old battery and replace it with the new one, making sure it is properly inserted. Close the battery compartment and test the key fob to ensure it is working properly.

Replacing the battery in your key fob is a simple and cost-effective way to ensure it continues to function properly.


In conclusion, the type of battery needed for a key fob depends on the make and model of the vehicle. It is important to refer to the owner’s manual or consult with a dealership or locksmith to determine the correct battery type.

It is also recommended to have a spare battery on hand in case the current one runs out of power. Properly maintaining and replacing the battery in a key fob can ensure smooth and uninterrupted use of the vehicle’s remote entry system.

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