How Many Joules Are In My Car Battery?

Joules is the SI unit that is used to measure energy. The amount of Joules in a car battery depends on the ampere-hour rating of your car battery. The number of joules in a new car battery will be different from the amount contained in a used battery.

What is the total amount of Joules in my car battery? A brand new 12v car battery has 12,960 Joules. On average there is approximately 3.6 watt-hours. One hour has 3600 seconds; therefore you can arrive at the number of joules by multiplying the two.

This makes it necessary for a car owner to be aware of the energy requirements that get imposed on the battery. It is advisable to use a battery that works efficiently and one that can provide sufficient energy for the smooth running of your electronics. Most cars have a 12v battery, so the amounts of joules we have provided above are limited to the 12v battery.

How Can I Convert Amp Hour (Ah) to Joules?

The best way to convert Amp Hour to Joules is by first determining the voltage in which the charge is first transferred. Another way of responding to this question is by determining the difference between Ah and Wh. Amp Hour is used to measure the amount of charge in a car battery. (You can read the example of this topic).

On the other hand, Watt-hour is used when measuring the amount of energy in a car battery. The only relationship between the two is the voltage. A battery measuring 36 volts will store twice more energy than the one containing 18 volts.

It is difficult to deduce the exact amount of joules in a car battery since the car battery is continuously used.

Will My Car Performance Improve If I Use a Larger Battery?

Replacing your 12v car battery with a larger car battery will not improve the performance of your car or any electronic gadget that uses batteries. This is simply because a large car battery will have a higher resistance compared to a smaller battery. The vehicle is designed to use only a specific type of battery, which has low resistance.

The only way a larger battery may work on the car is if it has a low resistance and if it will produce the right amount of current that will meet the requirements of the vehicle. If the current produced is more than the energy requirements of the car, it might affect the functionality of some components of the vehicle; such are headlamps.

Does the Type of Connectors I Use Affect the Performance of My Car Battery?

Connectors have an internal resistance that is measured in ohms. The total amount of resistance will depend on the nature of the material used and the pressure applied to the area of contact.

The area of contact refers to the point in which the connectors get attached to the battery terminals. One method of reducing resistance on the area of contact is by increasing pressure to maximize contact on the surface area.

If the connectors are loosely attached to the battery terminals, there will be high resistance. Always ensure to check your battery connectors and tighten them regularly.

As the vehicle moves around, the grip on the terminals may reduce, thus making the battery perform poorly. In this case, the issue may not be in the battery but the area of contact.

Another advantage of having a strong contact will reduce corrosion on the battery terminals. With a high pressure comes an increased motion between the terminals and connectors.

Related Article: What Cause Battery Terminal Corrosion?

You can prevent corrosion by using connectors that are plated with gold or nickel. Another cheaper method of reducing corrosion is by using lubricants.

Related Article: How To Clean Car Battery Terminals

What Is the Voltage in a Car Battery?

A fully charged car battery can have an average of about 12- 13 volts going upwards. However, when the engine starts or when the car is in motion, the voltage can run up to 13.8- 14.8 volts.

Voltage is responsible for making electric charges move from one place to another.

It can be referred to as a “push” that makes charges move across an electric conductor. A high voltage implies that there is more energy that can be consumed from the same amount of current.

You can learn from this article on everything you need to know about car battery voltage.

What Type of Energy Is Contained in a Car Battery?

The primary role of a car battery is to convert chemical energy to electrical energy. Inside the battery, there are electric cells that act as sources of electric energy whenever there is a need.

When the battery is not in use, the energy is stored. This type of energy is known as potential energy. It is converted to kinetic energy when its being used.

What Is the Total Amount of Volts Contained in a Double-A Car Battery?

Some cars have adopted the technology of using double-A batteries. On average, a double-A battery that is fully charged should have a voltage of about 1.4 volts. When the double-A battery is at its deathbed, the voltage may range between 1.0 to 1.3v.

The size of car battery will affect the performance of your vehicle. Having a large battery in a small car will limit its performance due to a high resistance level.


The amount of joules in a car battery depends on the state of the chemicals used in the cells. This implies that a new car battery will have higher energy than an old car battery.

The performance of a car is greatly affected by the quality of the battery it uses. Note that electric vehicles, solar-powered gadgets, generators, and other alternative energies rely significantly on the performance of a battery.