# Quick Answer: What Does Group Size Mean On A Battery??

Marine battery group size is one of many specifications found on boat batteries.

The group size is simply the physical dimensions of the battery housing as set by the BCI (Battery Council International).

## What do numbers on battery mean?

The “mah” number is a capacity number and the higher the number the more capcity your battery has, (the longer it will last between charges) the mah has no bearing on if your battery will fit a device, that is where the battery number comes in.

## How do I know battery group size?

First way to determine battery group size is to look for specifications in the vehicle manual. Battery specifications are generally present in the manual and are easy to get. Note down the specification written in letters and numbers. The second way is to look directly on your battery (See Figure below).

## What is a good CCA rating for car battery?

Cold Cranking Amps (CCA)

CCA is a rating used in the battery industry to define a battery’s ability to start an engine in cold temperatures. The rating refers to the number of amps a 12-volt battery can deliver at 0°F for 30 seconds while maintaining a voltage of at least 7.2 volts.

## What does group size 24 battery mean?

You may have heard common terms like a “group 24 battery” or “type 27 marine battery.” These numbers are referring to the Battery Council International, or BCI, Group Number of the battery. For deep cycle batteries, the larger the case size the more capacity the battery will usually have.

## What size is a group 24 battery?

Knowing exact BCI group battery size helps finding new battery replacement, however, knowing just BCI group size is often not enough.

BCI Battery Group Size Chart.

Group Size LxWxH (inches) LxWxH (cm)
Group 27 Batteries 12.0625 x 6.8125 x 8.875 30.6 x 17.3 x 22.5
Group 31 Batteries 13 x 6.8125 x 9.4375 33 x 17.3 x 24

3 more rows

Photo in the article by “Wikimedia Commons” https://commons.wikimedia.org/wiki/File:Detail_of_automobile_battery_pack_in_1,2_HTP_in_%C5%A0koda_Fabia_I.jpg