How Long Does Key Fob Battery Last

How long does a key fob battery last? That's a question that a lot of people have, and it's not always an easy one to answer. In this post, we're going to take a look at how key fob batteries work and what you can do to make them last as long as possible. So whether you're looking for ways to conserve battery life or you just want to be prepared in case your key fob dies, keep reading.

How long does key fob battery last?

Key fob batteries are typically either nickel-cadmium or lithium-ion. They work by using a small amount of electricity to transmit a signal that opens the car door. The transmitter in the key fob sends out a radio frequency that is received by a receiver in the car. When you press the button on your key fob, it sends a signal to the car that tells it to unlock.

One of the main things that affect how long your key fob battery lasts is how often you use it. If you only use your key fob once a week, it will last much longer than if you use it every day. In general, key fob batteries should last for about two years. But if you use your key fob multiple times a day, you may need to replace the battery more often.

There are a few things you can do to extend the life of your key fob battery. One is to avoid exposing it to extreme temperatures. If it's too hot or too cold, the battery will drain more quickly. Another is to avoid using it for extended periods of time. If you're going to be away from your car for a long time, it's best to turn off the key fob so that the battery doesn't run down.

Make sure you're not accidentally pressing the button on your key fob. Many people do this when they're walking or carrying something in their hands, and it can drain the battery quickly.

Give your key fob battery some extra care, and you will be able to enjoy it for a longer period of time. Follow these tips, and your key fob should last at least two years.

How do I know if my key fob needs a new battery?

One way to test if your key fob battery needs to be replaced is to try and open your car door with the key fob. If the door doesn't open, it's likely that the battery has died and needs to be replaced.

Another way to test your key fob battery is by checking the LED light. If the LED light is dim or not lit up at all, then the battery is likely weak and should be replaced.

If your key fob starts to act erratically or the button doesn't seem to be working properly, then you know what it needs. You can buy replacement batteries at most automotive stores or online. It's also a good idea to keep an extra set of batteries on hand in case you need them for your key fob. So if your key fob isn't working the way it should, don't wait - go ahead and replace the battery.

How long does a key fob last on low battery?

A new key fob battery has a life span of two to three years. However, this may vary depending on the make and model of your key fob battery as well as how often you use your key fob.

When a key fob is on low battery, it will usually last for about two weeks. If you use your key fob frequently, it may only last for a few days. If your key fob stops working, you can replace the battery yourself or take it to a professional.

So if you notice that your key fob is sluggish or not responding as it usually does, it may be time to replace the battery to avoid further problems.

How often should you replace the key fob battery?

It depends on the make and model of your key fob. For most key fobs, the battery should be replaced every two to three years. However, some high-end models have batteries that last up to six years. If you're not sure how often your key fob's battery should be replaced, consult the owner's manual or contact the manufacturer.

It is also best to use a high-quality battery. A high-quality battery is important for your key fob because it ensures that the fob will function properly and that you will be able to unlock your car when you need to.

Cheap batteries often don't have enough power to open the locks on a car, which can leave you stranded when you're in a hurry. A high-quality battery, on the other hand, will ensure that your key fob works every time, no matter what. So if you want to make sure that you're always able to get into your car, it's important to use a high-quality battery in your key fob.

What happens if the key fob runs out of battery?

If your key fob runs out of battery, you may experience inconveniences such as being locked out of your car. In some cases, you may need to call a tow truck or the police in order to get into your car. It is important to keep a spare key fob battery on hand so that you can avoid such inconveniences.


The battery is an important part of the key fob. Without it, the key fob will not work, and you might not be able to unlock your car. It is very important that you replace the battery in your key fob when it dies. A dead battery can also cause your key fob to stop working completely.  

There are a few ways that you can go about replacing the battery in your key fob. You can take it to a dealership, or you can purchase a replacement battery online or at a store. Make sure that you get a battery that is specifically designed for your make and model of car. If you do not have a key fob, or if your key fob does not have a removable battery, you may need to take it to a dealership or locksmith to have the battery replaced.

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.