What Does Battery Group Size Mean

Having difficulty picking out your next battery due to the downsides of each set size? Read on for a breakdown of the factors you should consider.

What is battery Group Size?

The main battery size groups are identified by the same system a chemist would use, which is the atomic mass unit. The numbers used in this system are milliamp hours.

In the world of cars, battery group size is between 4 and 6. Battery Group size on a Tesla can vary from 70 to 160. The range for Tesla will get better because the battery pack is removed so that it can be replaced with more powerful batteries.

Battery group size is used by manufacturers to determine the number of cells in their battery. The larger or higher the group size, the more powerful and longer lasting the battery will be. The numbers are written in millimeters which are a measure of area, so 100 mm equals one hundred square millimeters.

Battery Group Size: Common Terms

Battery Group Size is the specification used to describe the capacity of a battery or electric storage device with regard to the number of cells. The most common terms for Battery Group Size are AA, AAA, and C. Battery Group Size does not necessarily specify the voltage or amperage rating of a battery.

There are many types of batteries currently being used in electric cars today, each created for a specific purpose. Some are high-power and designed to last longer than others. For example, the all-electric Tesla Roadster uses lithium-ion batteries with a 1,000 amp-hour capacity, while the Nissan Leaf uses 1,940 Watt hours under a battery pack.

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A battery pack is denoted as a group of individual cells which are fully connected in series to create a larger, nominal voltage. This term is not universally agreed upon and many systems refer to the group of cells by how many batteries make up the group beyond a specified minimum size, for example “6V Group 23/Group.6” would denote a group of six 12-volt lead acid batteries set in a primary battery bank, two per rail and connected together with thermal connections.

What is the Cost of a Battery Pack with a Size A or B?

Battery size is a key factor for battery pricing. Batteries can be grouped by voltage, amp hours, or watt hours. The best way to understand it all is with the Express-a-Battery Calculator from AutoGeek.com

The size of a battery pack depends on the range of the electric car. Size B has a bigger battery but will probably be less expensive than size A. Size B is also the most popular size because it costs the same or twice as less as size A yet offers an equivalent range.

The battery size of a car determines what the cost will be on it. Because, the price is based on packs of five cells. Some people might consider a pack of eight cells to be bigger than a ten cell pack. Most car manufactures give each model an optimistic average consumption range and warranty length per battery size. And lastly, battery life also depends on how often it’s recharged because cold weather impedes battery life.

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Common battery Pack Sizes

A battery pack is the sum of cells that help power an electronic device. Most people purchase a battery pack depending on how large their device needs to be powered/charged. For example, most car batteries are grouped as either 6S, 7S, 8S, 9S or 10S lithium-ion batteries. However, using six 12-volt lead-acid batteries for a total of 72 volts isn’t quite as popular because it will take a lot longer to charge up because each of the individual batteries only have a voltage rating of 24 volts.

Battery sizes can vary among brands and types. The size also depends on what device is expecting the battery power. For example, electric toothbrush batteries are typically twice the size of a mobile
phone’s battery.
Different battery sizes lead to differences in how much range a vehicle can achieve on one charge and the type of charging required for those different batteries.

Battery groups are the same as pack sizes, but extend to begin at 12 volts and continue for 40 gallons or 100 kilowatts. The typical Tesla battery group size is now 240kW/100kWh.


This blog discusses some important considerations for battery capacity capacity to determine what type of vehicle is best. It covers the most common battery size configurations, their energy density, and how it does or does not factor into vehicle size.

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Battery group size is really important because it means the amount of energy that can be delivered to the electric motor. Buick Encore has a 9.3-kilowatt-hour battery group, which is not big at all. This means that this car does not have a lot of power at 76 horsepower and 44 lb-ft of torque with an EPA estimated 39 MPG city/43 MPG highway. So other brands might have a larger battery group that is necessary for their bigger horsepower or better torque figures or much more efficient gas mileage

Battery group size is important because it directly tells you how much energy a battery can store. In the case of Lead Acid batteries, group size refers to the number of cells connected in parallel inside a single battery. For instance, if two cells are in parallel to charge one cell, then the battery has two cells. Group size helps us determine how quickly each new cell is charged and discharged.

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