What Kind of Battery Does My Key Fob Need? Key Fob Battery Basics

In this article, we'll delve into the world of key fob batteries, providing you with essential information to keep your remote keyless entry system running smoothly.
What Kind of Battery Does My Key Fob Need
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In today’s fast-paced world, key fobs have become an essential part of our lives, making it convenient to lock and unlock our cars with just a push of a button. If you’ve ever wondered, “What kind of battery does my key fob need?” you’re in the right place. In this article, we’ll delve into the world of key fob batteries, providing you with essential information to keep your remote keyless entry system running smoothly.

Understanding the Key Fob

Before we dive into the specifics of key fob batteries, let’s take a moment to understand what a key fob is and how it works. Key fobs, short for key fobs, are small, handheld devices that allow you to perform various functions related to your vehicle, such as locking and unlocking doors, popping the trunk, or even starting the engine in some cases. They communicate with your car’s onboard computer through radio frequency signals.

The Importance of Key Fob Batteries

Key fobs are incredibly convenient, but they are only as good as the batteries that power them. Without a functioning battery, your key fob becomes nothing more than a small plastic shell. It’s crucial to understand the types of batteries key fobs use and how to replace them when needed.

Types of Key Fob Batteries

Key fobs typically use one of two types of batteries: lithium batteries or alkaline batteries. The choice of battery depends on the manufacturer and the specific model of your key fob.

Lithium Batteries

Lithium batteries are commonly used in modern key fobs due to their long lifespan and reliability. These batteries are known for their ability to provide a steady and consistent power supply, ensuring that your key fob functions smoothly for an extended period.

Alkaline Batteries

Some older key fobs may use alkaline batteries. While these batteries are more readily available and affordable, they tend to have a shorter lifespan than lithium batteries. You may need to replace alkaline batteries more frequently.

Identifying the Battery Type

To determine what kind of battery your key fob needs, you can follow these steps:

  1. Consult Your Vehicle Manual: The first place to check is your vehicle’s manual. It often contains information about the key fob and the type of battery it requires.
  2. Inspect the Key Fob: If you can’t find the information in your manual, open your key fob. Most key fobs have a small compartment that houses the battery. Carefully open it to reveal the battery type.
  3. Online Resources: You can also search for your key fob model online to find information about the battery type. Many manufacturers provide details on their websites or in user forums.

Replacing Your Key Fob Battery

When it comes time to replace your key fob battery, here are the steps to follow:

  1. Purchase the Correct Battery: Once you know the battery type, purchase a new one from an authorized dealer or a reputable store.
  2. Open the Key Fob: Use a small screwdriver or a coin to open the key fob’s battery compartment.
  3. Replace the Battery: Carefully remove the old battery and replace it with the new one, ensuring it is inserted correctly.
  4. Close the Key Fob: Put the cover back on the battery compartment and make sure it is securely closed.
  5. Test the Key Fob: Test your key fob to ensure it’s working correctly with the new battery.

Maintaining Your Key Fob Battery

To extend the lifespan of your key fob battery, consider these tips:

  • Keep the key fob away from extreme temperatures.
  • Use the key fob regularly to prevent the battery from dying prematurely.
  • If you have a spare key fob, rotate its use to prolong battery life.


How often should I replace my key fob battery?

The frequency of battery replacement depends on the type of battery your key fob uses and how often you use it. Lithium batteries typically last longer and may only need replacement every few years, while alkaline batteries may require replacement more frequently.

Can I replace the key fob battery myself?

Yes, you can replace the key fob battery yourself. It’s a simple process that usually requires only a small screwdriver or a coin to open the battery compartment.

What happens if my key fob battery dies?

If your key fob battery dies, you may not be able to remotely lock or unlock your car or perform other functions depending on your vehicle’s features. It’s essential to replace the battery promptly to regain full functionality.

Are there any signs that my key fob battery is running low?

Yes, some signs indicate a low key fob battery, such as a decreased range when using the key fob or the remote not working as expected. If you notice these signs, it’s a good idea to replace the battery.

Where can I purchase a replacement key fob battery?

You can purchase replacement key fob batteries from authorized dealerships, automotive parts stores, or online retailers. Be sure to choose the correct battery type for your key fob model.


Your key fob is a small but essential tool for your vehicle. Knowing what kind of battery it needs and how to maintain it can save you from the inconvenience of a dead key fob. By following the steps outlined in this article, you can ensure that your key fob continues to work reliably, providing you with the convenience and security you depend on.

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