How Long Do Car Batteries Last

Written by <strong>Kevin Miller</strong>
Written by Kevin Miller
Last Updated on June 15, 2021
How Long Do Car Batteries Last

It’s not always easy to have knowledge on when your car battery needs to be replaced. Many factors can cause a car’s battery failure, but the one thing they all have in common is that they will eventually lead to a dead battery. That means you need some way of figuring out if it’s time for a new battery now or not. Here are five warning signs when you should get a new battery with good performance!

But, before we speak about how long the car battery lasts, let us first know the working of the car’s battery. Once you get some idea about its mechanism, it will become relatively easy for you to estimate when the storm will retire.

How does a car battery work?

A car’s battery is an electrochemical device that converts chemical energy into electrical energy. A battery typically has six batteries connected in series. Each of these cells can be thought of as a small container capable of holding chemicals such as lead dioxide, sulphuric acid, or potassium hydroxide. There can be chemical reactions as well.

 When all the containers are full of liquid metal, the voltage will show 12 volts on your digital multimeter. Still, when they start getting discharged due to use, this drops down to 11 volts per cell, giving you six batteries at about five volts each for a total loss of power during discharge.

How long does a car Battery Last? You may ask it predominantly before buying a new car. It depends on several factors like how often it’s used and maintained properly. You may also go for car battery reconditioning. So, there isn’t any rule. But the typical lifespan of a car’s battery is about three years or 36,000 miles (56,000 kilometers).


5 Signs You must replace the battery of the car:

low starting engine elample

1) A low starting engine 

If you’re wondering how to tell when it’s time for a new car’s battery, many facts can point to the end of life. If your engine is slow starting right away or takes more than five seconds, this could be an indication that your starter may not work correctly and needs replacement.

One way to test if the problem was with the starter would be by trying again after replacing the old battery with a fully charged one. Another sign might be whether your headlights are dim noticeably when you turn on other electrical devices in your vehicle.

This usually happens because high demand drains power from specific components such as lights which draw heavily on the battery. You could call the mechanics to repair if the hardware issue persists. They will also check the terminals if there is a cranking sound.

2) Electrical issues and dim lights

The battery provides power to all the electricals inside your car. If you observe an electrical issue, that can be an indication of decreasing battery life.

The dashboard lights may be dimmer than usual, or the headlights might not work. If your car has a dome light that is on even when you exit, this can also indicate decreased battery life.

If any of these issues are emerging in your vehicle, it’s time to get some new batteries!

3) Varied indication electrical point of view

Some other indicators include problems with charging – if the engine starts but won’t charge after running for 20 minutes or so; warning lights coming on such as ABS and traction control warnings; slipping gears during acceleration; or fluctuating RPMs while accelerating from low speeds. These signals could mean that there is a problem with the alternator which a certified mechanic should inspect before proceeding further.

4) Corroded connection

The battery connectors are of great importance since they help with the flow of electricity. Corrosion on these connectors can occur when corrosion is not prevented from time to time. 

Connectors that have been corroded need replacement, and so does a car’s battery if the connector has any signs of corrosion because this will affect how much power it can generate.

Car batteries do wear out over time, but replacing them before there are indications would be suitable for your vehicle in general as well as save you money in repair costs down the road.

5) A stinking smell 

A bad smell in your car might be an indication of a problem with the battery. If you notice any signs, such as a musty odor or burning rubber, then it’s time to get that diagnosed by a mechanic! 

The smell will be like that of a rotten egg when you open the hood. Most probably, it is due to the leakage of the cell. 

Do you own a new car or an old vehicle? In both cases, you must check it immediately as this may lead to voltage issues. After that, your vehicle will stop responding now and then.

What causes the car battery to die quickly? 

It starts with the alternator. What is it, and what does it do? 

The alternator is found near to your car engine, and its role in maintaining battery life begins when you turn on your headlights or other electrical features of your vehicle. 

As soon as this happens, the alternator can usually be seen spinning (depending on how quickly all these things happen) because it’s working hard to make sure there are enough power supplies for every electrical system you use while driving. 

There are several different components. But, it will depend largely on how old your battery is. But also factors such as outside temperature, steering wheel usage requires a lot of electricity from the storm. Whether or not you’re using an air conditioner that needs more energy than usual etc. if any lights are left on, and so forth.

Hearing the clicking sound from under the hood?

The clicking sound from the hood is not a parameter to check the battery life of your vehicle. It may just be loose connections or something as simple as dirt on the contact points. If you have batteries in all locations and one of them goes dead, then it’s time for a replacement. You should also replace your car battery if you find that it can’t hold its charge anymore.

Some quick symptoms for car’s battery replacement

  • The engine light comes on
  • The headlights dim when turning sharply
  • The car doesn’t start after pressing in the key
  • Observing clicking sound from under the hood

The lights flicker while driving at night or running errands during daylight hours. The clicking sound is heard from under the hood when cranking up the motor and turning over the ignition switch repeatedly.

Repeated jumps are needed before the engine starts and runs smoothly for a few minutes or more without interruption before it dies again. You must check the periods of time and the hardware. The experts will check the terminals within the cell.

The car battery issues might be minor or major. It is important to know the parity between the two.

– Minor 

 The battery might be slowly draining. This happens when the alternator is not charging the car battery correctly or the electrical system, in general, is faulty. You can regularly oil the battery to keep it in a good state.

– Major 

There may be complexity with your vehicle’s charging system, such as corrosion on cables and connectors. You might also experience difficulties starting your engine if you have been driving for an extended period without running the engine to charge up both batteries together. If none of these situations apply, then it means that it is time for a new car’s battery!


If you want to keep your car batteries in good condition, go for a routine checkup. Check the battery fluid; look at the lights on the dashboard. Also, take a short test drive to see how your engine is running, and if it dies quickly, that’s not good. Moreover, Listen to the sound of your engine when you turn off the car. If it has an unpleasant rattling noise or makes no noise at all, get a new battery.