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Car Battery Replacemnet & Alternators | Exide, Century, Supercharge

Alternators and Batteries in a Car Charging System

The modern automotive charging system has not changed in over a few decades. we all are pretty much satisfied with how the same old charging system works to provide constant electric power. The automotive charging system has three main components: the battery, an alternator and the voltage regulator. 

Most people believe that a battery is the main component and it powers the electrics in your car. But that’s not the case as the main component is an alternator in the charging system of a car. The battery provides electricity only to start the engine of the vehicle and the rest is managed by the alternator. Let’s understand the difference between the battery and the alternator.


Battery Vs. Alternator

The battery is one of the main components of a car’s charging system. The main use of the battery is just to start the engine of the car. It all takes a little spark to start the engine and the battery provides that spark. Once the engine starts, all the responsibilities of the car’s electronics then shifted to the alternator.

A car’s battery has limited power and a car can only run for a few miles with that power. This is where the main component of the system comes in, the alternator. A car’s alternator in the charging system provides continuous power to the battery while the car is in motion and keep all the electronic components working at the same time.


An alternator is used to be called as a mini generator in the charging system as it generates enough electricity to keep the battery charged as well as keep the electronic components turned on. This component works with the battery of the car and both provide required electric power to the engine and other components.

By now you might have figured out the actual difference between the Car’s battery and an alternator. A car’s battery is nothing without the alternator and that’s the reason why you should get it properly serviced.

If you live in Brisbane city, then BrisbaneAutoShop provides the best of service for your car’s battery and alternator. It’s a leading car battery supplier in Brisbane city. You can also get your car’s old battery replaced with a new one. If you have any kind of issues with the battery or the alternator, you can get them repaired or can buy a new one from this place.

How Do Alternators work to generate electricity? 

An alternator generates electricity through the power produced by a moving car. The output of an alternator is Direct Current. An alternator consists of several parts that all work together to generate electricity. To know the actual functionality of an alternator, you first need to understand the different components of the alternator.

The system starts working when you start the engine by providing an electric spark through the battery. One by one, all the components of the alternator starts working to generate electricity for the battery and the electronic components of the car. Let’s see what are those components and how do they work! 

Alternator: Components and Their Functions

Voltage Regulator

The Voltage Regulator regulates the amount of power from the alternator to the battery. This component keeps the charging system stable. Each car requires different electric power and the functionality of the voltage regulator is depending upon the specifications of the car. 


This component is used to convert the power generated by alternator from AC to DC. The system needs to maintain the required power to keep the charging system stable. High voltage or direct current may affect the functionality of the charging system and this component provides required current to the system.


Rotor takes place inside the alternator which is the spinning mass. This component is attached to other components to drive the belt system. It is also called an electromagnet. 

Slip Rings

Slip Rings provide direct current and required power to the motor.


Bearings are used to rotate the electromagnet without external loads. It helps the motor and rotor to rotate the system smoothly to generate electricity.


The stator is considered as one of the main components in the alternator. It consists of wire coils and sits outside the rotor. It helps to create the magnetic field which is the start point of generating electricity.


The Pulley acts as a supportive component that supports the rotor shaft and the drive belt system. The drive system starts the charging process of the battery.

Once an alternator starts generating electricity, the voltage regulator comes in. This component shuts off the flow of the electricity to the battery when the voltage goes above the maintained level. The required voltage for the battery is 14 and a half voltages. It keeps the battery safe from overcharging.

As the car’s battery drained, the regulator turns on the flow and the cycle repeat itself. Engines mechanical helps an alternator generating electricity to recharge the battery and you will never run out of electric power.

Symptoms of alternator problems

The noticeable symptom of a bad alternator is poor electrical power. When you find that the electronic components of the car are not getting enough electric power through the battery, it’s the time to check the alternator and battery of the car.

Some cars have an indication system that turns on the indicator light when the alternator or battery is not performing well. Sometimes, a partially charged battery also indicates the same signs so you have to get it checked from the mechanic if everything is ok with the charging system.

Modern Service Stations have specialized tools to check the car’s charging system just by connecting the tool with the battery. Make sure you take the car to a service station if the car is experiencing any sort of issues with the electric system.