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What does the group size mean on a car battery?
The battery in my truck just kicked it. My dad offered to replace it for me if I bought a new one, but when I searched for batteries online I wasn’t sure what “battery group size” I need, or even what that means. What does the group size mean on a car battery?
Kathryn Mae Kurlychek · Updated on
Reviewed by Shannon Martin, Licensed Insurance Agent.
Your battery’s group size is important to know before you attempt to purchase a new one. Battery group sizes are designated based on certain characteristics of your battery, such as the size and dimensions of the battery, the layout of the battery’s terminals, and even what vehicles the battery is ideal for.
Battery group sizes are assigned by the Battery Council International (BCI), a trade association responsible for regulating battery manufacturing across the country. Batteries are broadly assigned to categories that indicate their usage—such as light-duty versus heavy-duty batteries—and further classified based on shared characteristics.
Some battery group sizes are also followed by a letter, like “F” or “R,” that indicates the terminal layout (such as “flat” or “reversed”).
In some cases, certain vehicles can accommodate a battery group size that is slightly larger or smaller than its original equipment battery—but if you’re not already familiar with battery groups, it’s safest to stay with the group size that originally came in your vehicle.
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Jerry partners with more than 50 insurance companies, but our content is independently researched, written, and fact-checked by our team of editors and agents. We aren’t paid for reviews or other content.
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