How to Replace Battery in Car Key?

Nothing can be more relaxing and comfortable than locking or unlocking and starting the car with the help of a single click or by digital key fob. This mini but useful tool gets operating power from the Battery present inside. Thus batteries usually have a 2-3 years life span but can also be weak or dead before reaching their age limit due to multiple reasons.

If your vehicle key fob’s range has decreased, the automobile is having trouble identifying its proximity, or the buttons have stopped responding to your touch, the battery for key fob is possibly dead. Changing the key fob is more expensive than replacing a battery in the key fob, so it is worth examining if the issue can be fixed with a new battery.

Remember, even if the battery is dead, you can still enter and start your vehicle. However, the locking and unlocking functionality of the remote will not work. The battery is only responsible for supplying power to the opening system of the remote; there will be no impact on the immobilizer. However, car key battery replacement is crucial to ensure the right and quick functioning of the car.

Now, you might be deliberating about how to open the key fob? The battery you need and the method to open it differ depending on the particular fob you have.

How To Change Battery In Key Fob?

Most prefer to hire a mechanic to perform this task. The reason is that they have experience in changing batteries in key fobs and can fix the problem more perfectly. However, changing a Battery in a car key fob is quite simple and one can easily perform it at home with the help of a few tools.

Are you planning to change your key fob battery? You reach the right platform because we are going to describe here the step-by-step process of changing the car key battery at home.

1. Discover The Notch To Open The Fob

This is the most difficult part because the notch may not be observable. There is a little gap at the top of some units. Nevertheless, you might have to check the connection point where the emergency key glides out for other units.

2. Use A Screwdriver To Open it

To open the key fob, you do not need special instruments or tools but a simple and small screwdriver. You can also use your fingernail to open it gently. Keep the screwdriver or try to pull your enlarged nail in the notch area and open it slightly. The entire unit will open in half down the center, disclosing a round keyless remote battery low inside.

3. Identify The Type Of Battery For the Key Fob

car fob battery

Different key fobs have different types and sizes of batteries. Moreover, they can also vary in shape and capacity. Therefore, the next step is the identification of the right type of battery. Look carefully at the battery inside and look for markings on it to know the model of the battery. Purchase a new one of the same type.

Make sure to buy a branded battery from a reliable store. Though its cost is a bit higher will provide long-lasting services and protect you from the stress of battery replacement for key fobs after a short duration. It will also save you time and money.

4. Swap The Existing Battery With The Brand-New One

Once you have done with the selection of the key battery and opened the car key fob, the next step is the removal of the old battery and place the new one in the fob. It’s quite a simple task.

The old car key battery low should come out effortlessly if you pop it out with your finger. Or you can also use a flat screwdriver to avoid trouble. Put the new one right in where the old battery was.

Make sure to place the new battery in the right orientation according to the plus and minus signs.

5. Close Up The Key Fob

After installing the new one, you can snap the key fob shut. When you squeeze it, it will click back into the correct place.

Depending on the new battery’s quality and how frequently you drive, you might have to change it every five years.

6. Test The Fob

Test The Fob

Point the fob at your automobile and try to utilize it. It should function instantly.

If it does not work, the car fob battery may be upside-down. You will need to open it again to check this.

If it does not resolve the problem, the fob may be damaged.

FAQs about Replacing Car Key Battery:

Where To Buy Car Key Battery Replacement?

There are various physical and online stores which are providing all types of car key batteries. However, make sure to select a credible vendor by reviewing their previous customer reviews or feedback and ratings. Always buy a branded battery rather than a cheaper one to ensure long-lasting and efficient working.

How To Tell if the Key Fob Battery is Low?

  • If your car key shows the following symptom then it’s a clear sign that your key fob battery is low or dead
  • If your car key is not working or showing any signals
  • If your vehicle is receiving signals when you press the fob buttons multiple times
  • If your key fob is unable to perform its function efficiently

Why Does My Key Fob Not Work After Replacing Battery?

One of the most common ways to fix a car key fob is by replacing its battery. However, if you are still facing the same issue then you need to look at other aspects also. It may involve the following reasons

  • Wrong buttons
  • Problems in the car lock system
  • Car locks may be broken
  • Electric issues
  • The key is damaged


Now, you know what to do when a car key battery dies.

You can easily exchange the battery by following this step-by-step guide.

However, if you feel you can’t do it yourself, you can visit your dealer; they will swap the battery in a few minutes and charge a very reasonable price.

If you want to read more about tips and tricks and vehicle repair tips, you can follow CarDecent.

Last Updated on March 9, 2023 by admin

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