What kind of batteries car keys

If you’ve ever owned a car, you know that car keys require small batteries to run. These batteries power the remote entry system, which allows you to lock and unlock your car from a distance, as well as perform other functions like activating the car alarm.

But what kind of batteries do car keys use, and how long do they typically last?

Generally, car key remotes use small, replaceable batteries that are similar to watch batteries. These batteries are typically lithium-ion batteries, which are known for their high energy density and long lifespan. In most cases, car key batteries will last for several years before needing to be replaced.

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However, the exact battery used in your car key may vary depending on the make and model of your car, as well as the specific key fob you are using. Some car keys may also use rechargeable batteries rather than replaceable ones. It’s always a good idea to consult your car’s manual or a trusted mechanic to determine the exact type of battery your car key requires.

The Different Types of Batteries Used in Car Keys


The CR2032 is a small, coin-shaped battery commonly used in car key fobs. It is a lithium battery, which means it lasts longer than other battery types, making it a popular choice for everyday use. The CR2032 has a voltage of 3V and can be found in most electronics stores.


Another common type of battery used in car key fobs is the CR2016. This is also a lithium battery and has a voltage of 3V, but is smaller than the CR2032. It is often used in smaller key fobs. The CR2016 can be found in most stores that sell electronics.

AA Batteries

AA Batteries

AA batteries are often used in car keys that have a remote start function or other advanced features. The remote start function requires more power, making it necessary to use a larger battery. AA batteries have a voltage of 1.5V and can be found in most stores that sell batteries.

Watch Batteries

Some car keys use watch batteries, such as the SR621SW or the SR626SW. These batteries are also small and coin-shaped, and have a voltage of 1.5V. They are often used in car keys that have a limited amount of buttons or features.

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There are a variety of batteries used in car keys, each with their own benefits and uses. The CR2032 and CR2016 are popular choices for everyday use, while AA batteries are used in keys with more advanced functions. Watch batteries are also used in some keys. It’s important to know which type of battery your key requires, so that you can replace it when needed and ensure that your key continues to function properly.

Alkaline Batteries

Alkaline Batteries

What are alkaline batteries?

What are alkaline batteries?

Alkaline batteries are commonly used in car keys as they are reliable, long-lasting and have a high energy output. They are called ‘alkaline’ because the electrolyte used in them is an alkaline solution, which is a type of base that has a pH greater than 7.

Advantages of alkaline batteries

  • Long shelf life: Alkaline batteries have a long shelf life and can retain their charge for up to 5 years, making them a perfect choice for car keys that are not used frequently.
  • Higher energy output: Alkaline batteries have a high energy output, making them a reliable source of power for car keys even in demanding conditions.
  • Cost-effective: Alkaline batteries are cost-effective and widely available, making them an ideal choice for everyday use.
  • Environmentally friendly: Alkaline batteries are considered to be safer for the environment compared to other types of batteries as they do not contain heavy metals such as mercury and cadmium.

Disadvantages of alkaline batteries

Disadvantages of alkaline batteries

However, there are also some disadvantages to using alkaline batteries. They can leak and corrode the battery compartment if left inside for too long, and as they deplete, their voltage drops off rapidly, making it difficult to predict when they will run out of power.

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Alkaline batteries are still a popular choice for car key remotes due to their reliability, longevity, and overall cost-effectiveness. They may not be the best choice for devices that require a consistent voltage output, but for low-drain devices such as remotes, they are the go-to power source.

Lithium Batteries



Lithium batteries are commonly used in car keys and other electronic devices due to their lightweight, small size, and long-lasting power. They are also known for their high voltage and energy density, making them an ideal choice for devices that require high power output.



One of the main advantages of lithium batteries is their long battery life. They can last for several years, making them a cost-effective solution in the long run. They also have a low self-discharge rate, meaning they can hold their charge for a long time, even when not in use. Additionally, lithium batteries are relatively light, making them easy to carry around.

  • Long battery life
  • Low self-discharge rate
  • Lightweight


Despite their many advantages, lithium batteries do come with a few drawbacks. One of these is their high cost. They tend to be more expensive than other types of batteries, though this is changing as more manufacturers begin producing them. Additionally, lithium batteries can be dangerous if carelessly handled. They are highly flammable and can explode if not handled properly.

  • High cost
  • Potentially dangerous if mishandled


Despite their high cost and potential hazards, lithium batteries are a popular choice for a variety of electronic devices, including car keys. Their long battery life and high energy output make them an ideal choice for devices that require a lot of power, while their lightweight and compact size make them easy to carry around. With proper handling and care, lithium batteries can provide long-lasting, reliable power for years to come.

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What type of batteries do most car keys use?

Most car keys use a type of battery called a CR2032 lithium coin cell battery.

How do I know when the battery in my car key needs to be replaced?

Usually, a low battery in your car key will result in reduced range or failure to operate. Some car keys also have a battery warning light or message that will indicate when the battery needs to be replaced.

Can I replace the battery in my car key myself?

Yes, in most cases you can replace the battery in your car key yourself. However, some keys may require special tools or professional assistance to replace the battery.

How long do the batteries in car keys last?

Depending on usage, the batteries in car keys can last anywhere from 1-3 years.

What happens if I use the wrong type of battery in my car key?

Using the wrong type of battery in your car key can cause damage to the key or the car’s electronics. Always consult your car’s manual or a professional before replacing the battery in your car key.

Can I recharge the battery in my car key?

No, the batteries in car keys are not rechargeable and must be replaced when they run out of power.

What should I do if my car key battery dies?

If your car key battery dies, you will need to replace the battery in order to continue using the key. Some cars may also have a backup key that can be used in case of a dead battery.

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James Johnson

As a male reader, I found the article on “What kind of batteries car keys use” informative and useful. It’s always been a mystery to me what type of batteries are needed to keep my car key fob powered, so it was great to finally have some clarity on the subject. Learning about the different types of batteries used in car keys, such as lithium, silver oxide, and alkaline, has given me a better understanding of what to look for and expect when it comes to replacing the battery in my key fob. The tips provided on how to extend the life of the battery were also helpful, as I now plan on removing the battery from my spare key fob until needed. Overall, this was a great read for anyone who wants to know more about the batteries that power their car keys.

William Carter

As a male car owner, I found the article “What kind of batteries do car keys use” very informative. It’s always frustrating when your car key battery dies unexpectedly, and this article has helped me better understand the type of batteries my car keys use and how to replace them. I especially appreciated the tip on using a coin to open the key fob, as I’ve struggled with getting it open in the past. Overall, this article has been very useful and I’ll be sure to bookmark it for future reference.

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Isabella Martinez

As a female driver, I found this article about car keys and their batteries very informative. As the article explains, most car keys use small lithium-ion batteries that last for several years. I never knew that changing the battery in my car key was such a simple task and that it could be done at home without needing to take it to a dealership. It’s also interesting to know that different car models use different types of batteries, so it’s important to check the owner’s manual or consult a professional if unsure. Overall, this article provided valuable information for car owners and has taught me more about the technology behind car keys.

Michael Wilson

As a man who is interested in cars and their technology, I found the article “What kind of batteries car keys” very informative. I always wondered what type of battery my car key uses, and after reading this article, I now know that most car keys use a small lithium-ion battery. It’s interesting to learn that these batteries can last several years, which is good to know if you’re worried about the battery dying and being stuck without access to your car. That being said, the article also wisely suggests replacing the battery every few years to ensure reliability. Overall, I found this article useful and informative for anyone who wants to learn more about the technology behind car keys and their batteries.

Mia Hernandez

As a female reader, I found this article on “What kind of batteries do car keys use?” quite informative and practical. It’s easy to overlook the significance of the small, but essential battery that powers our car keys. The article comprehensively explains the different types of batteries that car keys use and the factors affecting their lifespan, such as frequency of use and temperature. I especially appreciated learning about the pros and cons of using alkaline versus lithium batteries in car keys, and the impact of leaving the keys unused for an extended period. The tips on how to extend the battery life of car keys were useful as well, and I’ll certainly apply them to my own keys. Overall, this article is a great resource for anyone who uses car keys and wants to ensure that they function reliably and for a long time. The easy-to-understand language and clear explanations make it accessible to both car enthusiasts and those with limited technical knowledge. Highly recommended!

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