How To Change A Key Fob Battery

Did you know that the key fob battery in your car needs to be replaced every few years? If you didn’t, don’t worry – you’re not alone. A lot of people may not know this, but it’s important to keep the key fob battery in your car working properly. In this blog post, we will teach you how to change a key fob battery. It’s a pretty simple process, and once you do it a few times, it will become second nature. Keep reading for instructions on how to change your key fob battery.

Key Fob Battery Chart

Brand Model Battery Type Battery Life
Honeywell 5800 Series CR2032 5 Years
Schlage NDE Series CR2 5 Years
Kwikset KW1 CR2032 5 Years
Kaba e-Plex 2000 CR2032 2 Years
Von Duprin 99/3000 CR2016 2 Years
Baldwin 8200 Series CR2450N 2 Years

How do you open a key fob to change the battery?

A key fob is a small, wireless keyless entry device that is used to unlock or start a vehicle. It typically has a key ring attached so that it can be easily carried with you. The key fob communicates with the car‘s locking system or ignition system wirelessly, allowing you to unlock the car or start the engine without having to fumble for your keys.

A key fob is powered by a small battery. The battery powers a circuit that includes a transmitter and a receiver. When you push the button on the key fob, it sends a signal to the receiver in your car, which unlocks the door. The key fob battery needs to be replaced every few years, as it will eventually wear out.

Here’s a generic guide on key fob battery replacement:

First, you will need to gather some supplies. You will need a screwdriver, a new key fob battery, and something to protect the car’s key fob from scratches (like a cloth or towel). Once you have gathered your supplies, it’s time to start the process of changing the key fob battery.

Second, open the key fob casing. There are a few ways to open a key fob case. One way is to use a butter knife or nail file to pry it open. Another way is to use a small screwdriver in the slot on the side of the case. If you have the original key, you can also try inserting it into the lock and turning it. Whatever tools you would prefer to use, be sure to pry open the key fob casing gently and avoid forcing it open. This is to avoid damaging the key fob or other internal components.

Also, please note that there are key fobs where you need to remove the physical key first before opening the case. Be sure to inspect first the key fob model before opening it.

Third, remove the old key fob battery. Once you have opened the case, carefully remove the old key fob battery and dispose of it properly. The new key fob battery should be exactly like the one that was in your fob previously (same size and voltage). Make sure that the positive and negative sides of the battery are in the correct positions, and then insert the new battery into the case.

Fourth, close the key fob casing. Be sure to snap it shut firmly so that it is properly sealed. Don’t forget to reattach the physical key back to the fob if necessary and test it out on your car.

And that’s all there is to changing a key fob battery. The process should only take about five minutes or so, depending on how experienced you are with this type of thing. If at any time during the process you feel uncomfortable or unsure, please contact an automotive professional who can help you out.

Can I replace a key fob myself?

Yes, you change key fob battery yourself. In fact, there are a few benefits to replacing the key fob battery yourself:

1. It’s a relatively easy task – most people can do it in just a few minutes.

2. It’s cheaper than taking the car to a mechanic or dealership.

3. You’ll have peace of mind knowing that you replaced the battery yourself and didn’t need to rely on someone else.

4. It’s an opportunity to learn more about your car and how it works.

5. It’s a great way to learn more about your key fob and how to troubleshoot potential problems.

However, there are cases that you can’t replace the battery as it depends on the make and model of your car key fob. Some fobs can be replaced by opening up the battery cover and swapping out the batteries, while others may require a visit to a dealership or locksmith.

It is always best to read the owner’s manual for your car key fob to see if it is a user-replaceable battery type. If it is, all you’ll need is a set of replacement batteries of the same voltage and size as the ones that came with your key fob. If your car key fob uses an electronic chip that requires programming, you’ll need to take it to a dealer to have it reprogrammed.

What kind of battery goes in a key fob?

A key fob battery is typically a CR2032 battery.

A CR2032 battery is a 3V lithium coin cell battery that is commonly used in electronic devices such as key fobs, watches, and various medical devices. The battery has a shelf life of about five years with proper care and, if not stored in extreme temperatures.

When looking for a CR2032 battery, it’s important to buy from a reputable source in order to avoid getting a fake. A telltale sign of a counterfeit battery is poor quality construction, so be sure to inspect the battery closely before purchasing.

The best way to tell if a CR2032 battery is genuine is by checking the authenticity code on the packaging or on the battery itself. If the code doesn’t match, then it’s likely a fake.

Where can I buy remote?

Key fob batteries are available for purchase on Amazon and at most grocery stores, drugstores, and electronics retailers such as Best Buy or Walmart. The price of the battery will vary from store to store but typically cost between $0-$12 depending on where you shop.


Key fob batteries may seem like a small and insignificant part of your car, but they actually play a very important role. That’s why it’s so important to make sure you have the best battery for your key fob and know how to extend its lifespan. The battery is essential to your key fob’s functionality and should be replaced when it begins to lose power.

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About the author, Phil Borges

Phil Borges is a battery aficionado. He's written extensively about batteries, and he loves nothing more than discussing the latest innovations in the industry. He has a deep understanding of how batteries work, and he's always on the lookout for new ways to improve their performance.