How do car batteries work?

Cars are one of the most used vehicles in our daily life. But do we know how this works? Of course with a battery. 

The car operates through its battery. Now in this article, you will know how car batteries work. And from this, you can make a decision which car battery you can use.

To know how a car battery works, we have to know the variety of car batteries. There are mainly two types of car batteries. They are Wet and VRLA.

How do wet car cell batteries work? 

This car battery’s other name is a Lead-acid battery. Lead-acid batteries contain a combination of lead, lead dioxide, and battery fluid electrolytic solution. The electrolytic solution contains acid and water. 

There are two plates in the battery, one is the anode, and another one is the cathode. The negative terminal will attach with the anode and the positive terminal will attach with the cathode. An anode and cathode contain electrons. For attaching manufacturers use a battery terminal.

After attaching, lead, lead dioxide, and electrolytic solution occur in a chemical reaction. When the chemical reaction allows, then electricity starts flowing through the terminals to the load attached. 

There are two types of wet car cell batteries.

  1. Deep cycle batteries
  2. SLI batteries
  3. The price range of a wet car cell battery is 45$-50$.

How do VRLA  batteries work?

VRLA car battery cell wants to obtain ‘recombinant’ technology. Normally, water-delivered oxygen on the positive plate is consumed by the negative plate. On the contrary, this suppresses the generation of hydrogen on the negative plate. 

Instead, distilled water ( H2O) is produced protecting the moisture within the battery. This battery never needs watering. You can use a lead plate for sealing this battery. This battery also contains sulfuric acid. Sulfuric acid also helps in the working process. 

There are two types of VRLA batteries:

  1. AGM battery 
  2. Gel batteries

This type of car battery price belongs to the range of 5$-10$.

How does a car battery store energy?

The battery stores energy in the form of chemicals. But it provides electrical energy. Because chemicals wish to react with each other. They want to make new chemicals as they can create more electrons. The energy quantity depends on the battery’s innermost active area and the chemical reactions. 

The chemical reaction occurs voltage and then stops the chemical to make a reaction. When it starts to flow current from the battery then the chemical reaction occurs again to place the electron from one side to the other side of the battery. And then also some voltage drops. For the displacement of the electrons, the battery produces current.

A rechargeable battery reverses this process and connects a voltage to the battery. At a glance, the process is, the battery stocks the current in the chemical forms and the chemical reaction discharges that in the form of current. 

So in short, a car battery provides electrical energy by storing chemical energy. This is the process of how car batteries store energy. 

How long does a car battery last?

The longevity of the electric car battery is kind of unpredictable. But this has some factors like time, heat, how long it can carry its charge, capability of charging, battery capacity, etc. Besides, it also depends on the chemical composition of the car battery. 

As we know there are various types of batteries, so below you can see the average car battery’s lifespan.

  • Lead-acid battery

Normally Lead-acid batteries have a battery life of 3 to 5 years. But sometimes it can pass to 12 years. For that, the user should maintain temperature, capacity, age, etc. For example, the ideal temperature for storing a lead-acid battery is 50°F or less than that. Besides, the user should use the battery after fully charging. 

  • Gel and AGM battery

These batteries offer a lifespan of five to six years if you give them a complete charge and at an unused rate. After 5 to 6 years it starts to degrade deliberately. But it tries to maintain 80% under normal conditions. The battery charger of the gel battery is 2.3 to 2.36 volts.

  • Electric car battery

EV batteries’ lifespan is 8 years, under normal driving conditions. But from the research, we found that this battery will lose 2.3% of its beginning range yearly. This battery is also known as a lithium-ion battery.

  • NiMH battery

This battery has a battery life of 6 years. Normally you can recharge this battery more than a hundred times. 

When do I need a battery change?

The average life cycle of any car battery lies between 4 to 5 years. But it can last more if it’s well taken care of. And then the user should use a new battery. After our research, we have seen that most people suggest replacing car batteries within 3 to 4 years. Besides, some signs are a red signal for the battery:

  • If the user doesn’t use the car for a long time, then a dead car battery can be found. One might believe that using a car often can hurt the battery. But it is the opposite. Because when you use the car then the battery charges itself. These are driving tips for the drivers.  
  • When the car struggles to start, it’s also a sign of car battery replacement. And for this user can also find a dead battery. The user has to use a new battery as an alternator. 
  • You should not use the old battery for a long time.


There are a lot of car batteries that people use in the country in electric vehicles and electric cars. But for cars, the Deep Cycle battery is now operated worldwide. People now are also using 12-volt batteries for electric vehicles. 

Battery users should be careful while using it. A car battery can have a long lifespan if you utilize it carefully. Nowadays people are also using jumper cables to stop the car battery from dying.

To conclude, car batteries provide electrical energy and store chemical energy. And if you find any issues with the car battery, then it’s better to check out your car. 

Frequently asked questions:

  • How do tesla car batteries work?

Hybrid motors can take charge from outlets, but Tesla batteries can’t do it. This battery is capable of warming in cool temperatures. They operate fully on battery power, so they can’t be charged while driving.

  • What type of battery is a car battery?

There are two types of batteries that are used in cars. One is a wet cell battery and another one is an SLI battery. 

  • Can a battery go dead from sitting?

Yes, it can. The battery recharges itself while driving. But if you don’t operate, then it can’t get its charge.

Leave a Comment