Tips on Determining Your Car Battery Group Size Using the Size Chart

All cars need a battery for it to work properly. However, you cannot just buy any battery and expect it to function in your vehicle. Some car battery group sizes may fit in various vehicles. Having this in mind, are you aware of the different sizes and how they work?

By understanding the car battery group size chart, it will be easier to find a replacement for your car’s battery. Batteries differ in several ways, like purpose, cell type, and chemistry. But if you will have an idea of how the grouping works, then you can go wherever you want to without worrying.

Knowing Your Car Battery Group Size

When determining the appropriate car battery group size, you need to know the various physical dimensions. There is a group that can help you with this. The BCI or the Battery Council International determines the numbers and letters for the size of the battery group.

Generally, the car battery group size is measured by the make, model, and engine of your car. Some vehicles can utilize different batteries. It is still best to know which batteries work and which doesn’t. With this, you worry less when your car gets into trouble.

The car battery sizes chart will help you get the right battery size easily. You need to make sure that the battery will fit on your engine’s hood perfectly. With the help of the car manufacturer’s designations, you can do all these things.

Different kinds of car batteries

The car battery group size chart includes group number, the performance level, weight, dimensions, and others. The batteries are classified in various ways.

Before going into details, let us first know what does battery group size means? A battery group size is a standard for vehicle batteries that indicates the physical size of the battery, including their polarity (position of the positive and negative battery posts). There are lots of machine-based batteries, but we will discuss only a few of them.

Group 8D

A very large battery that is used for commercial purposes belongs to this group. Batteries belonging to this group are used mostly for RVs, medical applications, and security systems. The most popular used 8D cells include the Gel-cell SLA (Sealed Lead Acid), which contains lithium iron phosphate chemical.

Group 24

Batteries belonging to this group are the multipurpose batteries that are used for UPS (United Parcel Service). You can also use these batteries on wheelchairs as well as other industrial technologies. This mid-sized battery is available in different dimensions. If you try to fit a Group 24 into a different battery compartment, it might cause a problem.

Group 27

This group is quite large similar to the 8D version. It has an Ah range from 66 to 110. Also, they are quite heavy. Their weight can range from 54 to 70 pounds. There are three types of Group 27 batteries – Group 27, 27F, and 27H.

Group 31

Batteries under this group are used in a boat and other marine technology. This group is quite popular these days. The batteries in this group are large that vary in chemistry, design, and use.

Group 34

Group 34 battery is not as large as compared to Group 31. However, it is a solid medium to a large battery. The batteries Ah may range from 50 to 75. It has a reserve capacity from 100 up to 145 minutes. The best thing about this group is that it is not heavy. It only weighs from 37 to 51 pounds. This group of batteries is best for deep cycle, and it is also known for its cranking properties.

Group Size L x W x H (inches) L x W x H (cm)
Group 24 Batteries

10.25 x 6.81 x 8.88

26 x 17.3 x 22.5

Group 27 Batteries

12.06 x 6.81 x 8.88

30.6 x 17.3 x 22.5

Group 31 Batteries

13.00 x 6.81 x 9.44

33 x 17.3 x 24

Group 34 Batteries

10.25 x 6.81 x 7.88

26 x 17.3 x 20

Group 35 Batteries

9.06 x 6.88 x 8.88

23 x 17.5 x 22.5

Group 51 and 51R Batteries

9.37 x 5.06 x 8.81

23.8 x 12.9 x 22.3

Group 65 Batteries

12.06 x 7.50 x 7.56

30.6 x 19 x 19.2

Group 78 Batteries

10.25 x 7.06 x 7.68

26 x 17.9 x 19.6

Differentiating group battery sizes

When it comes to differentiating group battery sizes, there is no fixed rule about it. With regards to length, a battery may range from 7 to more than 20 inches. In width, the batteries range from 5 to 7 inches. And finally, the height ranges from 7 to more than 9 inches. There are also groups with different varieties of batteries that you need to know. These include the recessed top post, the standard top post, and the side-post.

The side-post cells use Group 78, 75, 74, and 70. All of them have wire ending with a screw pressed on it.

The recessed top battery, on the other hand, is best for any car manufacturer located in Europe. Some of the manufacturers may include Volkswagen, BMW, Ferrari, Audi, and a lot more. The group size belonging to this group are 41, 47, 42, 48, and 49.

The standard top post batteries are designed for Japanese cars. American and import cars also fit well on this. The range of numbers is 24, 34, 25, 35, some numbers in the 50s and 65. The batteries mentioned create a connection with the metal hood, which can result in a great spark.

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Differentiating group battery sizes

Your purpose in buying a battery is to start your vehicle. Some need it for dual purpose and deep cycle. Likewise, several other cell types are starting from AGM, gel cell, and flooded battery.

A gel cell battery utilizes a liquid electrolyte. These types of batteries are quite tough. Gel cell batteries will not break down even if the temperature gets hot or in case of physical shock. In particular, a gel battery is sealed and dry when it is time to use it in the car.

While the AGM battery makes use of a glass mat without overflowing any plates, the fibers help them to mesh together for better efficiency. With this option, you will not have any issue with spilling battery acid. Finally, chemistry uses lithium, NiCd, lead-acid, and NimH.


Now that you have an idea, it is up to you to find which group size battery you need. With the help of the car battery group size chart finding a replacement is easy and accurate. You don’t have to worry as you will have the right battery for your car.

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