What size batteries are in cars

When it comes to car batteries, one size does not fit all. The size of the battery your car needs depends on a few factors, such as the make and model of your car, the type of engine, and even the climate you live in. In this article, we’ll take a closer look at the different sizes of car batteries and which cars use them.

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Before we dive into the specifics, it’s important to understand why car batteries are sized differently. The amount of power your car battery can produce is measured in cold cranking amps (CCA). CCA refers to the amount of current your battery can deliver for 30 seconds at 0°F before the voltage drops below a minimum level. The more amps your battery can produce, the better it can start your car’s engine, especially in cold weather.

One thing to note is that car battery sizes are standardized, so no matter the brand or type of battery, it will fit the battery tray in your car. The two most common sizes are group 24 and group 35. Group 24 batteries are typically found in larger, more powerful cars, while group 35 batteries are used in smaller cars and SUVs.

Understanding Car Batteries

What are Car Batteries?

What are Car Batteries?

Car batteries are essential components in a vehicle’s electrical system. They are rechargeable and provide the necessary electrical power to start the car, power the lights and other accessories, and run the engine’s electrical systems.

Types of Car Batteries

There are two main types of car batteries: lead-acid batteries and nickel-metal hydride batteries. Lead-acid batteries are the most common type, and they are used in most vehicles. Nickel-metal hydride batteries are found in hybrid electric cars.

Car Battery Specifications

Car batteries are rated based on their voltage, current, and capacity. The voltage rating of a car battery is typically 12 volts. The current rating, which is measured in amperes, determines the amount of electrical current that the battery can supply. The capacity rating, which is measured in ampere-hours, indicates how long the battery can provide power before it needs to be recharged.

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Car Battery Maintenance

Car Battery Maintenance

Car batteries require regular maintenance to ensure that they function properly. This includes checking the battery’s fluid level, keeping the battery terminals clean and free of corrosion, and ensuring that the battery is properly charged. It’s also important to replace the battery when it reaches the end of its useful life, which is typically around three to five years depending on usage.

Types of Car Batteries

Lead-Acid Batteries

Lead-acid batteries are the most commonly used type of car battery. They are affordable, reliable, and have been used for over 100 years. The battery consists of lead plates and an electrolyte solution made of sulfuric acid and water. These batteries can be rechargeable, and are ideal for powering starter motors and ignition systems.

AGM Batteries

AGM stands for Absorbed Glass Mat. In these batteries, the electrolyte is absorbed by the glass mats, which makes them leak-proof and vibration-resistant. These batteries have a longer lifespan than traditional lead-acid batteries and can be used in high-performance cars.

Lithium-Ion Batteries

Lithium-Ion Batteries

Lithium-ion batteries have gained popularity in recent years due to their higher power capacity and energy density. They are much lighter and smaller than traditional lead-acid batteries, making them ideal for use in electric cars. These batteries are also known for their longer lifespan, making them a more cost-effective option in the long run.

Deep Cycle Batteries

Deep cycle batteries are designed to provide a steady flow of power over an extended period of time, rather than a sudden burst of power like lead-acid batteries. They are ideal for use in powering car accessories like sound systems, lighting, and other electronic devices.

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Gel Batteries

Gel batteries are similar to AGM batteries in that their electrolyte is absorbed by a gel rather than a liquid. These batteries are non-spillable and maintenance-free, making them an attractive option for those who want a hassle-free battery.

Flooded Batteries

Flooded batteries are the most traditional type of lead-acid battery. They are the cheapest option but require regular maintenance to keep them in good condition. These batteries are not a good choice for high-performance cars but can be used in standard models.

Common Sizes of Car Batteries

Group Size

Group Size

The most common way to categorize car batteries is by group size. Group sizes are determined by the Battery Council International (BCI) based on the physical dimensions of the battery and its terminal placement. The most common group sizes for cars are 24, 34, 35, 48, 65, and 75.

Cranking Amps (CA) and Cold Cranking Amps (CCA)

Another important factor when choosing a car battery is its cranking amps (CA) and cold cranking amps (CCA). CA and CCA are measurements of the amount of current a battery can provide to start the car’s engine. The higher the CA and CCA, the easier it will be for your car to start. Batteries with higher CA and CCA are generally larger in size.

Other Considerations

Aside from group size and CA/CCA, there are other factors to consider when choosing a car battery. Some batteries have longer lifespans, while others are more tolerant to extreme temperatures. It’s important to choose a battery that’s compatible with your car’s electrical system and meets your driving needs.

  • AGM (absorbent glass mat) batteries are a popular option for modern cars with numerous electronics. They are more expensive but provide more reliable starting power.
  • Lead-acid batteries are the most common type and are generally the most affordable.
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In Conclusion

When it comes to car batteries, there is no one-size-fits-all solution. It’s important to consider the size, CA/CCA, lifespan, and compatibility with your car’s electrical system. By choosing a high-quality battery that meets your needs, you can ensure that your car starts smoothly and reliably, no matter the weather or driving conditions.

How to Determine the Size of Your Car Battery

How to Determine the Size of Your Car Battery

Step 1: Find the Battery

Step 1: Find the Battery

The first step to determine the size of your car battery is to locate it. In most cars, the battery can be found under the hood, near the front of the engine and above the front wheels. However, some cars have their batteries located in the trunk or under the back seat.

Step 2: Check the Battery Label

Once you have located the battery, check the label on top of the battery. The label should have important information about the battery, including its size and type. The size of the battery is usually indicated by a series of letters and numbers, such as “Group 24” or “Group 35”.

Note: If the label has worn off or is not legible, you can also check your car’s owner’s manual for information on the battery size.

Step 3: Measure the Battery Size

If you are unable to find a label on the battery or your car’s owner’s manual does not have information on the battery size, you can measure the size of the battery. Measure the length, width, and height of the battery in inches using a tape measure.

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Group Number Length (in) Width (in) Height (in)
24 10.25 6.8125 9.4375
35 8.9375 6.5 7.875
47 10.875 6.8125 7.875

Note: The table above shows the dimensions of some common battery sizes. These dimensions may vary for different brands and models.

Step 4: Determine the Amp Hours

Step 4: Determine the Amp Hours

Another important factor to consider when determining the size of your car battery is its amp hours. Amp hours (Ah) refers to the amount of charge a battery can hold. This is especially important if your car has high electrical demands, such as a large sound system or other aftermarket accessories.

The amp hours should also be indicated on the battery label. If you can’t find the label, you can also look for a code on the battery case that includes a letter, such as “D” or “E”, followed by a number. The number usually indicates the amp hours.

By following these steps, you can determine the size and amp hours of your car battery, which will help you choose the right replacement battery for your vehicle.

Replacement and Maintenance of Car Batteries

Replacing Your Car Battery

Replacing a car battery is a simple procedure that can be done by anyone with basic knowledge of vehicle maintenance. The first step is to identify the correct battery for your car based on its make, model, and year. Once you have purchased the new battery, you should turn off the engine and remove the negative cable from the existing battery. Then, remove the positive cable and any retaining brackets or clamps. Lift out the old battery carefully and replace it with the new one, making sure it is secured in place as per manufacturer instructions. Finally, reconnect the cables and check that the battery is working correctly.

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Maintaining Your Car Battery

Maintaining Your Car Battery

Maintaining your car battery involves keeping it clean and in good condition to ensure optimal performance and lifespan. Regularly inspect your battery for any signs of corrosion or damage, and clean it with a solution of baking soda and water if necessary. Additionally, ensure that all connections are tight and free of rust. It is also important to regularly check the battery’s fluid levels and refill with distilled water as needed. Finally, consider investing in a battery tender or charger to keep the battery charged and extend its lifespan.

Choosing the Right Car Battery

Choosing the Right Car Battery

When choosing a replacement battery for your car, consider factors such as its size, voltage, and capacity. It is important to purchase a battery that matches your car’s specifications to ensure proper function and performance. Additionally, look for a reputable brand and consider selecting a battery with a warranty to guarantee its quality and longevity. With proper maintenance, the right battery can keep your car running smoothly for years to come.


What size batteries are commonly used in cars?

Most cars use a 12-volt battery, but some hybrid and electric cars may use higher voltage batteries.

Can I replace my car’s battery with a different size or voltage?

It is not recommended to replace your car’s battery with a different size or voltage, as it can cause damage to your vehicle’s electrical system.

How long do car batteries typically last?

Car batteries usually last between three and five years, but this can vary depending on usage and the climate in which you live.

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What is the best way to maintain a car battery?

The best way to maintain a car battery is to keep it clean and free of corrosion, and to ensure that it is always fully charged.

Do I need to replace my car’s battery after a certain amount of time regardless of its condition?

While car batteries are generally expected to last between three and five years, it is not necessary to replace a battery before it fails or shows signs of significant wear and tear.

What should I do if my car’s battery dies?

If your car’s battery dies, you can either jumpstart it using another car’s battery or call for roadside assistance.

How do I know when it’s time to replace my car’s battery?

Signs that it may be time to replace your car’s battery include slow engine cranking, dim headlights, and a battery warning light on your dashboard.


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John Thompson

As a male car enthusiast, I found this article very informative and interesting. It was fascinating to learn about the different types of batteries used in cars and how they differ in size and function. I was surprised to learn that the battery in a vehicle is responsible for more than just starting the engine, but also powering the various electrical components in the car. I appreciated the explanation of the different sizes of batteries used in cars and their corresponding specifications. This information was helpful in understanding the importance of selecting the right battery for one’s vehicle. Overall, this article was a great resource for understanding the role and importance of car batteries. It was well-written and easy to follow, making it accessible to anyone, regardless of their level of automotive knowledge. I would definitely recommend this article to other car enthusiasts or anyone interested in learning more about the inner workings of their vehicle.

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Isabella Clark

As a female driver, I was always curious about the battery that powers my car. After reading this informative article, I now know that the size of a car battery varies depending on the make and model of the car. It was interesting to learn that most cars use lead-acid batteries, which come in different sizes and configurations. The article also provided some useful tips on maintaining the battery’s health, such as keeping it clean and free of corrosion. Overall, I found this article to be very helpful and informative, and I now feel more confident in my knowledge of my car’s battery. I would definitely recommend this article to other drivers who are curious about the workings of their vehicles.

William Davis

As a male reader interested in all things automotive, I found this article on car batteries quite informative. It was interesting to learn about the different battery sizes that are available and the factors that determine which size is necessary for a specific vehicle. The explanation of the role that cold cranking amps play in the functionality of a battery was also enlightening. Overall, this article provided valuable insights into the world of car batteries and will definitely be useful for anyone looking to purchase or replace a battery for their vehicle.

Robert Johnson

As a male reader, I found this article quite informative and useful. I never really gave much thought to the batteries in my car, but now I am better informed about the different sizes and types available. I appreciated learning about the advantages and disadvantages of each type, and the factors that determine which size is best for my vehicle. It’s always important to have a basic understanding of the components of our cars, and this article was a great resource for that. Overall, I would recommend this article to anyone who wants to learn more about the batteries used in cars.

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Sophie Williams

As a female driver, I found the article “What size batteries are in cars” very informative. I never knew that car batteries come in different sizes depending on the make and model of the vehicle. It’s good to know that there are certain factors to consider when buying a new battery, such as the type of climate you live in and the type of driving you do. I also appreciated the tips on how to prolong the lifespan of your car battery, such as avoiding extreme temperatures and keeping a regular maintenance schedule. Overall, this article not only educated me on the different sizes of car batteries but also provided helpful tips for taking care of them, which will save me money in the long run.

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