What Battery Goes in My Key Fob?

If you’re reading this, chances are your car key fob is acting up – blinking slowly, refusing to unlock your car doors, or just dead altogether. A dead key fob battery is a common culprit, and luckily, it’s an easy and inexpensive fix you can often do yourself. But before you run to the store, you need to know “What Battery Goes In My Key Fob?”

This comprehensive guide will walk you through everything you need to know about key fob batteries, from identifying the right type for your vehicle to replacing it yourself. No more frantic Google searches or trips to the dealership!

Identifying Your Key Fob Battery

First things first: let’s figure out what kind of battery your key fob needs. Here are a few ways to do that:

Check Your Owner’s Manual: Your car’s owner’s manual is a treasure trove of information, including the specific type of battery your key fob uses.
Look at the Existing Battery: If you can open your key fob (more on that in a bit), you can usually find the battery type printed directly on it. Common types include CR2032, CR2025, and CR1632.
Consult Online Resources: Websites like KeyFobX offer detailed guides and information about key fob batteries for various car makes and models. For example, you can find out what battery goes in your Nissan key fob or a Mazda 3 key fob right here on our site!

Common Key Fob Battery Types

Most car key fobs use small, coin-shaped lithium batteries. Here are the most common types you’ll encounter:

CR2032: This is the most common key fob battery. It’s 20mm in diameter and 3.2mm thick.
CR2025: Slightly thinner than the CR2032, this battery is also 20mm in diameter but only 2.5mm thick.
CR1632: Smaller than the previous two, this battery is 16mm in diameter and 3.2mm thick.

How to Open Your Key Fob

Once you know what type of battery you need, it’s time to open your key fob. Here are the two most common designs:

1. Key Fobs with a Release Button:

Locate the small release button or switch on the back of your key fob. It’s often near the key ring attachment.
Press the button and gently separate the two halves of the key fob. You might need to apply a little pressure.

2. Key Fobs Without a Release Button:

Look for a notch or groove along the edge of your key fob. This indicates a seam where the two halves connect.
Insert a small flat-head screwdriver or a coin into the notch and gently twist to pry open the key fob. Be careful not to apply too much force and damage the casing.

Pro Tip: If you’re unsure about opening your key fob, consult your owner’s manual or search for a video tutorial specific to your car make and model.

Replacing the Battery: A Step-by-Step Guide

Gather your supplies: You’ll need the new battery (of course!), the open key fob, and optionally, a small non-metallic tool (like a toothpick) to help remove the battery.
Open your key fob using the methods described above.
Locate the battery. It’s usually sitting in a small compartment, sometimes held in place by a small clip or cover.
Carefully remove the old battery. If necessary, use the non-metallic tool to gently pry it out. Avoid using metal tools to prevent short-circuiting the battery.
Note the orientation of the battery (positive (+) and negative (-) sides).
Insert the new battery in the same orientation as the old one. Make sure it sits flush in the compartment.
Snap the two halves of the key fob back together until you hear a click.
Test your key fob by locking and unlocking your car doors.

Congratulations! You’ve successfully replaced your key fob battery like a pro.

Frequently Asked Questions

1. How long do key fob batteries last?
Key fob batteries typically last between 3 to 5 years, depending on usage and environmental factors.

2. Can I use any battery for my key fob?
No, you should always use the specific battery type recommended by your car manufacturer.

3. What happens if I put the battery in backward?
Inserting the battery backward won’t damage your key fob, but it won’t work. Double-check the orientation before closing it up.

4. Can I replace the key fob battery myself, or do I need to go to a dealership?
Replacing a key fob battery is a simple task you can easily do yourself. Our step-by-step guide makes it a breeze!

5. My key fob still doesn’t work after replacing the battery. What should I do?
If your key fob still doesn’t work, there might be a different issue, such as a programming error. Consult your owner’s manual or contact a qualified automotive locksmith or dealership for assistance.

Need More Help?

We hope this guide helped you understand “What battery goes in my key fob?” and how to replace it. But if you’re looking for more specific instructions, check out our other helpful resources:

Remember, a little knowledge goes a long way. By understanding your Key Fob and its battery, you can save yourself time, money, and frustration in the long run.