How Many Volts in Car Battery?

How Many Volts In Car Battery

Usually, the battery in the car is 12 volts or above when the car is running, the battery is measured at 13.7 to 14.7 volts.


When the engine is not running, A fully charged battery should give you a healthy reading of around 12.4-12.6v.

A Multi-meter is used to measure the voltage in a car. To detect possible differences between two points in an electrical circuit voltmeter is used.

What Is a Battery?

A battery is an instrument that stores chemical energy and converts it into electrical energy.

Chemical reactions in batteries involve the flow of electrons from one electrode to another through an external circuit.

The flow of electrons provides an electric current that can be used to work, to balance the flow of electrons, even charged ions.

The electrolytes in contact with both electrodes flow through the solution. Different electrodes and electrolytes cause different chemical reactions.

This affects how the battery works, how much energy it can store, and its voltage.

Why Only 12 Volts Battery Is Used in Cars?

The mid-1950s saw the introduction of the 12-volt automotive electrical system in new cars

Ohm’s law states that for the same power in a circuit, doubling the voltage halves the amount of current required.

Simply put, a high current requires large wires. High voltage saves money and makes it more reliable.

This is a convenient shape for the standard electrical components found in cars.12 volts is the most common voltage in an automotive battery because that’s the size of the small motor found inside the starter and alternators

How to choose the right battery?

Today, all types of cars include 12-volt lead-acid batteries. The newer technology used in cars such as power stop, start, internal lights, infotainment system, speakers, etc., starts the process of draining the battery faster. New technology is widely used in today’s high-end cars.

Battery capacity is neglected when using this technology. This requires that you focus on the equipment used in your car and the battery of the capacity that suits them.

When is the right time to replace/change a car battery?

Experts in the field recommend replacing the battery every two to three years to avoid any problems with the car.

If a new car is purchased, the car battery should be replaced every two to three years.

However, if you are buying a second-hand car, you need to consider its usage and other factors to determine its battery life. Here are some signs of when to replace the battery.

If it takes a long time to start the car or if the car does not start at the first blow, then it must be understood that there is an issue with the battery.

If the battery is down, the spark plug may not work. Therefore, it is time to repair or replace the battery.

If the headlights light up or down in the dark at night or if the light is not clear, you may notice that the battery is down.

In most cars, if the battery is down, the ‘check engine’ notification will automatically appear on the console. This means the battery is down and needs to be replaced or recharged.

Even if the battery goes down, there is no need to panic. Because, nowadays, it has become very easy to charge the battery.

How To Check Car Battery

  1. Turn off the car ignition
  2. Open the battery positive terminal cover. Check and clean the battery terminals.
  3. Connect the voltmeter’s positive wire to the positive terminal on your battery. The positive wire on the voltmeter is usually red.
  4. Connect the voltmeter negative lead to the negative terminal of the battery.
  5. Check the voltmeter. If your battery is in good condition, the voltage must be between 12.4 and 12.7 volts. A measurement result of fewer than 12.4 volts indicates that your battery needs to be charged.

If the effect of the reading is less than 12.2 volts, the battery is a “trickle charge“, which is a slow charge. And then check back.

If the reading result is higher than 12.9 volts, you have an excess voltage. Turn on the high beam light to eliminate its extra voltage charging. Excessive voltage can be a sign of the battery being overcharged by the alternator.

Even if you have a voltmeter on hand, you should still do a load testing (power supply) check on the battery.

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