Here’s How To Change Battery In Honda Key Fob: A Simple Guide

Every vehicle owner knows the importance of having a fully functional key fob. It’s the gateway to convenience, offering ease of access to your car at a button’s touch. For Honda owners, the key fob is no different.

But what happens when the battery inside this little gadget starts to run low? This blog post aims to guide Honda car owners on how to properly and safely replace the battery in their key fobs. So, let’s delve into the details of this simple yet essential process.

How to Change the Battery in a Honda Key Fob

Changing the battery in a Honda key fob is a straightforward task that you can accomplish at home without the need for professional assistance. Here are step-by-step instructions:

1.      Prepare the Necessary Tools

You’ll need a flat-head screwdriver and a new CR2032 3-volt battery, which you can easily find at an electronics store.

2.     Open the Key Fob

The first step is to open your Honda key fob. On the back of your key fob, locate a small indentation that is the perfect size for the head of your screwdriver. Insert the screwdriver into this slot and gently pry the two halves of the key fob apart. Be cautious not to apply too much force as it may damage the key fob.

3.     Remove the Old Battery

Once you have the key fob open, you will see the battery housed inside. It’s held by a metal clip. Carefully remove the battery from the clip using the screwdriver.

4.     Insert the New Battery

Now it’s time to install your new CR2032 battery. Take note that the positive side (the side with the ‘+’) should be facing up when you insert it. Make sure that it’s securely held by the metal clip.

Button cell battery.

5.     Close the Key Fob

After replacing the battery, align the two halves of the key fob and press them together until you hear a click sound. This indicates that the key fob is securely closed.

6.     Test Your Key Fob

Once you have replaced the battery and closed the key fob, test it with your car to ensure that it’s working properly.

Changing the battery in your Honda key fob is as simple as that. Remember, regularly changing the battery will help maintain the functionality and reliability of your key fob. Always check your key fob’s battery level to ensure that you won’t find yourself unable to unlock your car due to a dead battery.

Choosing the Right Honda Key Fob Battery

The type of battery used in most Honda key fobs is a CR2032 3-volt battery. This is a small, coin-shaped battery that is widely available in various stores such as pharmacies, supermarkets, and electronic shops.

When purchasing a new battery, make sure it is a CR2032 and not any other variant, as different types might not fit or function correctly in your Honda key fob. It’s also crucial to buy a reputable brand for reliable, long-lasting performance.

What Should I Do If my Honda Key Fob Falls Apart?

In the event that your Honda key fob falls apart, don’t panic. It can usually be put back together without much difficulty. First, find all the pieces, especially the small rubber buttons as they are essential for the fob’s function. Arrange the buttons in the correct order on the front cover of the fob.

Then, place the battery and the circuit board back into the back cover. Ensure that the battery and the board align with the respective areas correctly. Once everything is back in place, simply snap the two halves together.

Receiving new car key.

However, if the key fob is damaged or some parts are missing, you may need to purchase a new one. It’s also possible to get a replacement key fob from your local Honda dealership. Keep in mind that a new key fob will need to be programmed to work with your specific vehicle, which is something the dealership can assist with.

Do You Have To Reprogram A Honda Key Fob After Changing The Battery?

No, you generally do not need to reprogram your Honda key fob after changing the battery. The fob’s programming is stored on a chip inside the device and should not be erased or altered when the battery is replaced. If your key fob isn’t working after a battery change, it’s more likely that the new battery is dead or installed incorrectly.

What To Do When Honda Key Battery Is Low?

When your Honda key fob battery is low, you should replace it as soon as possible. The key fob may start to work less reliably, or stop working altogether, making it difficult to unlock, lock, or start your vehicle. You can replace the battery following the steps outlined in previous responses, using a new CR2032 battery and a small flat-head screwdriver.

Can I Replace The Key Fob Battery Myself?

Yes, you can replace the battery in your Honda key fob yourself. It is a simple task that only requires a new CR2032 battery and a small flat-head screwdriver. Just pry open the key fob, remove the old battery, insert the new battery with the positive (‘+’) side up, and then close the key fob.

Can You Start A Honda With A Dead Key Fob?

Yes, most Honda vehicles allow you to start the car with a dead key fob. This is done using the key fob’s built-in key, which can be revealed by pressing a button or sliding a latch on the fob. This key can be inserted into the ignition in the traditional way.

However, this is generally intended as a backup solution, and you should replace your key fob battery as soon as possible to regain full functionality.

The CR2032 battery is recommended for Honda key fobs primarily because of its size and power capacity. It’s a 3-volt lithium battery, with just the right dimensions and electrical characteristics to fit in the fob and provide the power needed for its operation. The CR2032 is also commonly available, making it easy to find when a replacement is needed.

What Could Potentially Happen If A Different Type Of Battery Is Used In The Honda Key Fob?

If a different type of battery is used in the Honda key fob, it might not function correctly. The battery could be too large or too small to fit in the battery compartment, or it might not provide the correct voltage. Using a battery with a higher voltage could damage the electronic components of the fob, while a lower voltage might not provide enough power for it to function.

What Are Some Of The Signs Of A Low Battery In A Honda Key Fob?

Signs of a low battery in a Honda key fob include decreased range, inconsistency in functionality, and ultimately, the fob not working at all. If the key fob starts to behave inconsistently or you need to be closer to your car for it to work, it’s likely time to replace the battery.

What Should You Do If Your Honda Key Fob Is Not Working After Replacing The Battery?

If your Honda key fob is not working after replacing the battery, first check to make sure that the battery is installed correctly, with the positive side facing up. If the battery is installed correctly and the fob still doesn’t work, try another new battery – it’s possible the replacement was defective.

If the problem persists, it may be a more serious issue with the fob itself, in which case, it might be necessary to seek professional help or purchase a new key fob.

What Precautions Should You Take When Changing The Battery In A Honda Key Fob?

When changing the battery in a Honda key fob, there are a few precautions to take. Ensure you’re using a non-conductive tool, like a plastic pry tool or a flat-head screwdriver, to avoid any short circuit risk.

Technician using a flat screw driver for an electronic repair.

Be gentle when prying open the key fob to avoid damaging the casing or internal components. Lastly, when handling the new battery, try to limit touching the battery surfaces as oils and dirt from your hands can impact battery life and performance.

Why Is It Essential To Ensure That The ‘+” Side Of The CR2032 Battery Faces Up When Inserting It Into The Key Fob?

The ‘+” side of the battery is the positive terminal. In electronic devices, correct battery orientation is critical because devices are designed for current to flow in a specific direction. If the battery is inserted incorrectly, the key fob may not function because the electrical current will not flow correctly.

What Are The Benefits Of Being Able To Replace Your Honda Key Fob Battery At Home?

Replacing your Honda key fob battery at home offers several benefits. It saves time as you don’t have to schedule an appointment and travel to a dealership or locksmith. It’s also cost-effective since you only need to purchase a relatively inexpensive battery rather than paying for a service.

Additionally, knowing how to perform this task equips you to resolve the issue immediately should your key fob battery die unexpectedly.

If The Key Fob Is Not Functioning Even After A Battery Replacement, What Could Be The Possible Reasons?

If the key fob falls apart and some components are lost, it could potentially render the key fob nonfunctional. The loss of buttons might mean you can’t send specific commands to your vehicle, while losing internal components could disrupt the key fob’s communication with your car. In such cases, you might need to buy a new key fob and have it programmed to your vehicle by a professional.

If A Honda Key Fob Battery Is Low, Will It Affect The Functioning Of The Vehicle Itself?

While a low key fob battery won’t affect the operation of the vehicle itself once it’s started, it can disrupt the convenience features the key fob offers, like remote unlocking and locking, or the remote start feature found on some models. In some advanced keyless entry systems, a low battery could potentially prevent you from starting the car if it cannot detect the key fob’s signal.

What Is The Average Lifespan Of A Honda Key Fob Battery?

While the lifespan can vary based on usage, most Honda key fob batteries can last between 2-5 years. Regular usage of the key fob for remote functions can drain the battery faster. If you find that your key fob battery is not lasting at least a couple of years, it may be worth having your key fob inspected by a professional for any issues that might be causing the battery to drain more rapidly.


Maintaining the functionality of your Honda key fob is integral for enjoying the full benefits of your vehicle’s convenience features. Changing your key fob battery at home is a straightforward task, requiring only a new CR2032 battery and a flat-head screwdriver.

Being aware of the signs of a low battery and knowing how to replace it promptly can save you time, money, and potential inconvenience. However, if you encounter difficulties or your key fob stops working, don’t hesitate to seek professional help. Remember, the key to a well-functioning key fob lies in regular checks and proper maintenance.

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About Matthew Webb

Hi, I am Matthew! I am a dedicated car nerd! During the day, I am a journalist, at night I enjoy working on my 2 project cars. I have been a car nerd all my life, and am excited to share my knowledge with you!