How Much Does a Car Battery Weigh? [Size & Weight of 12 V Car Batteries]

If you own a car then you must have seen what a battery looks like. As a result, you must have also gone to the stores or the mechanic to get them fixed when a problem showed up in the car. It is important to change the car battery every three to five years and the 12V batteries are the most common ones that are used in the market. Have you ever wondered how much does a car battery weigh?

Let us see what these batteries are in shape and what they look like! We are here to determine the size and weight of the batteries!

Dimensions of 12V Batteries

It is observed that the following are the dimensions of a 12V battery:

Length = 9 to 10 inches (22.9 to 25.4 centimeters)
Width = 5 to 7 inches (12.7 to 17.8 centimeters) wide
Height = 8 to 9 inches (20.3 to 22.9 centimeters)

12 V Battery Weight= 48 pounds (21.8 kilograms).

However, there are several factors that are responsible for determining the length and dimension of the battery!

How Much Does a Car Battery Weigh? Length = 9 to 10 inches, Width = 5 to 7 inches, Height = 8 to 9 inches

How Much Does a Car Battery Weigh? [Size & Weight of 12 V Car Batteries]
Dimensions of Car Battery

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Size and Weight of 12V Batteries

There are different requirements of cars which are needed for particular cars. There is no universal size that fits all cars and hence there are ways to determine which battery is suitable for your car! Let us have a look at them, shall we?

BCI group size charts

The BCI group chart is the one that is simply taken into consideration for showcasing the kind of battery that will work for a particular model of the car.

You can look up the chart easily on the internet to know the standards for selecting the right kind of battery for yourself.


The charge of an older battery is less compared to the one that is newly brought out of the box. The weight of such a battery will be considerably less than a newly bought 12V battery. The weight of an empty battery that is completely discharged weighs around 7 pounds (3.2 kilograms).

Weight class

Two weight classes are there that must be considered for choosing a car battery, light, and standard! The light battery weighs around 30 pounds (13.6 kilograms. It is generally used for small passenger vehicles whereas the weight of the standard batteries is about 48 pounds (21.8 kilograms).

BCI Groups

The BCI groups help you to distinguish between the different kinds of batteries depending on the basis of weight!


Dimensions of different BCI group batteries remain the same but the size may vary considerably depending on the brand that manufactures them.

Battery Type

There are mainly eight kinds of batteries that are available on the market. It is specific to a particular model and brand of car that is going to make use of which kind of battery.

Why do the weight and size of the Battery matter?

The size and weight of batteries matter and they are categorized by the groups of BCI. The size and weight of the batteries are indeed given importance as a basis for differentiation because they are used for showcasing the different levels of power that each can supply to the car!

If for instance, a larger battery is placed inside a smaller car then excess power that is supplied by the battery may not be beneficial for the longevity of the car. It puts pressure on the alternator and in turn reduces its life.

The battery holder that is present underneath the car hood showcases the size of the battery used.

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Why are Car Batteries so Heavy?

The average weight of a car battery is around 48 pounds and you can compare it to the weight of a hay bale to understand the size and capacity of the same. The major component of a car battery is lead which is 11.4 times heavier than the density of water.

It is estimated that roughly 60% of a lead-acid battery (one of the 8 car battery types) is composed of lead.

So if it was possible to remove all the lead from the composition of the battery then you would see 19.2 pounds (8.7 kilograms) of plastic and other materials left behind.

General Overview

Most cars, trucks, and SUVs make use of generalized 12V batteries. It is vital to have knowledge about the size and the weight of a 12V battery before you purchase them so that you are able to yield better performance. To make a choice of the right one, it is important for you to know which kind of 12V battery to purchase for your vehicle.

What do you mean by a 12V Battery?

To start the engine and provide the required power to run other parts of the car, you will need a basic 12V battery. It converts the stored chemical power to electrical power in order to supply energy to the engine to run the car.

You should be knowing that a 12V battery consists of 6 cells, each with 2.1 volts when fully charged. You must note that a battery is called completely charged when it is at 12.4 volts and is considered fully charged at 12.6 volts. Below 12.4 volts, it is regarded as a discharged battery.


1) How much is the weight of a car battery in grams?

The standard weight of a car battery is 40 pounds, this is equal to 18143.7 grams.

2) What battery size and weight is important?

The manufacturers will certainly mention the required size and shape along with the weight of the battery to be used for a specific model of the car. It is an important factor to match the capacity of the battery and the alternator for the best performance.

Either you will not have enough space to fit the battery inside the compartment or the life of the alternator will be greatly reduced if you forcefully use a battery of greater power in a small car. The battery terminals may get in contact with the metal hood, and get overheated to cause a spark and fire.

3) How much does an electric car battery weigh?

The batteries that you use in an electric car are lighter than the ones used in normal standard cars like the 12V ones. The weight of such a battery is around 20 pounds. This is exactly half the weight of the 12V batteries that are used in standard cars, trucks, and small passenger vehicles like SUVs.

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