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How Many Volts Are In A Car Battery

Are you wondering how many volts are in a car battery? Did you ever wonder why your car won’t start after turning it off for several hours or minutes?

The main reason is that the battery’s power will eventually dissipate over time, which doesn’t make much sense.

This guide will show you how many volts are in a car battery, how to maintain your car’s battery, and why the time between starting your car can affect its voltage when you try to start it later.

How Many Volts Are In A Car Battery

A car battery will generally have a voltage between 12 and 24 volts. On average, most works at about 14 volts. A car’s electrical system usually runs on 12, so the alternator charges it up to 14 while the engine is running.

This ensures that you always have enough power to start your vehicle or run accessories, even when the engine isn’t running.

A car battery contains six cells, each with 2.1 volts. To sum up, the voltage of one cell is 2.1 volts, whereas to sum up the voltage of all six cells together makes it 12.6 volts, which reduces to about 1 volt per cell in a series circuit system due to the small voltage drop in each cell.

When it comes to charging, the alternator produces 14 volts and sends this directly through the regulator to the battery.

The voltage regulator keeps this at a safe level for both you and your car, preventing too much power from flowing into the battery when it is complete.

This would damage your vehicle by boiling off the water inside the battery or cause an explosion by boiling off its electrolyte (the acid).

At the end of the day, your car battery has about six cells, each having 2.1 volts; together, this makes over 12 volts. The electrical system in your car runs on around 12 to 14 volts, so it charges up when you are driving.

2 Methods to Test Your Car’s Battery Voltage

First, you can test your battery’s voltage with a voltmeter. It will tell you the exact volts of your car’s battery. If you need to know how many volts are in your battery, here is what you should do:

Method 1: How to Test Your Car’s Battery Voltage with a Volt Meter

To test your car’s voltage, simply remove the battery first and then look inside for a small label on it. Just below that label, you should be able to see a section that says “+” or “-” or has an arrow next to it. You can also check the owner’s manual to be sure.

The voltage reading should be the same as what we mentioned earlier in this article.

Here’s how to test car battery voltage using a voltmeter

  1. This is probably the easiest method of testing the voltage of your car battery. First, you need to remove the positive and negative terminals from the battery before measuring its voltage so it won’t short out while you’re getting ready. 
  2. Then, look for a small black label on top. On that label, you should see “+” or “-,” or maybe an arrow. Make a note of the voltage there, and then remove the other terminal from the other side as well.
  3. Finally, make sure your voltmeter is on DC volts before testing out the car battery’s voltage. Now, simply put one probe on each terminal until you get a reading.
V Max 220 V Analog voltmeter, Rs 80 /unit V Max Technologie | ID:  20239362491

Method 2: How to Test Your Car’s Battery Voltage with a Multimeter

You can also use a multimeter, which is an upgraded voltage meter. The battery should be replaced and fully charged before you try this method. Be sure to read the owner’s manual if your vehicle has one so that you know how to turn on the voltmeter function of your multimeter.

Here is how to check your car’s battery voltage using a multimeter

  1. First, turn on your multimeter and set it to the voltage function (DC V). Then, put the black probe in the jack labeled “COM” or “-” on your multimeter. Put the red probe of your multimeter into the jack labeled with a “+” sign. Check if they are securely connected.
  2. Next, get the positive (+) and negative (-) terminals of your battery. It should be labeled on the battery case. If it isn’t, you can recheck the owner’s manual or look at the section below this one for more information on how to find your car’s battery voltage.
  3. Attach your probes to those terminals (make sure they are securely connected), and you should get a reading. It might be different from your car’s voltage, but it should be the same within around half a volt.
  4. If your multimeter cannot read any voltage, there could be an issue with your battery or electrical system. You can try to charge up your battery or have it looked at by a mechanic.
How To Use a Digital Multimeter | What is a Multimeter?

When should you check your car battery voltage?

The most common time for people to check their car battery voltage is when it fails to start the vehicle. If this happens, you will need to charge it up and see what its voltage is.

Other than that, it’s a good idea to test your battery every so often if you want to know how many volts are in a car battery.

If you are planning to store a car for a longer period of time, make sure you check the battery’s voltage before storing it and after bringing it back to use.

If the voltage drops below 12 volts, it won’t be able to start your vehicle if you need to use it.


Knowing how many volts are in a car battery is useful if you want to test or charge it. It’s important to make sure the voltage of your vehicle’s battery is at least 12 volts, which is enough power to start your vehicle. However, if you’re going to store your car for a while then the battery will get down.

Another thing you need to know about car batteries is that they need maintenance every 6 months. You can do this by checking the fluid level in it. This will ensure that your car is always ready to start up when you need it to.

In addition, make sure you regularly check the battery’s voltage with a voltmeter or multimeter when starting the vehicle and after storage. This will help prevent corrosion from building up on the terminals of your car battery.

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