How much voltage does a car battery need to start banner

For a car with a 12V engine, the normal value before starting is between 12.2V and 12.8V, and it should not exceed 14.8V after starting.

What is the minimum voltage needed to start a car?

When the voltage of the starting power supply is lower than 11.8V, it will be difficult to start the car. You can choose to turn off all other electrical appliances and try several times. When the battery voltage is lower than 10.8V, it is generally impossible to start the car. You need to replace the battery or use Jump Starter to start the car in an emergency.

Battery voltage value judgment chart (for 12V cars)

Battery voltage value judgment chart (for 12V cars)

Therefore, the minimum voltage to start the car should be 11.8V, but if you are lucky, you may be able to start at 10.8V, but we don’t recommend on this.

Starting Battery Voltage


Impacts and Solutions

Before Start


Too Low

Cannot Start Vehicle, The battery may need to be replaced

Before Start



Hard to Start, turn off all other electrical appliances and try several times

Before Start




After Start


Too Low

May not be able to recharge the battery

After Start




After Start


Too High

May damage the battery, check the engine stabilizer


Why is there insufficient voltage of starting battery?

In fact, insufficient voltage of starting battery it will be accompanied by some characteristics, you can basically detect it.

For example, if you feel that the starter is weaker when you start the vehicle thus ignite several times; or if you drive a few more electrical components on the vehicle, it will be idling unstable, etc..

Or when our car has not been started for a long time, the lead-acid battery (starting battery) inside will also self-discharge, which will also cause the voltage to be too low.

How to solve it, when the battery voltage is too low?

1. Use a multimeter to check the battery voltage

If you usually want to measure the voltage of your car, just use a multimeter to measure it directly;

2. Call an auto repair shop or roadside assistance company

A lot of company provide automobile jump start services 24/7, and you can find numerous results on Google;

Google search auto repair shop jump start car

Google search auto repair shop jump start car

3. Buy a Portable jump starter and put it in the car as a spare

You can purchase a portable jump starter place in your car, according to the displacement of the car you are using. When encountering this kind of emergency, you don't need to wait for road rescue, you can start your car in an emergency. After your car starts, you can recharge your battery, or replace it with a brand new battery.

Most jump starters on the market on-sale, have the functions of power bank and LED light. They can also supply power to your other electronic devices. Like JA301, they also have an air inflator function, which can be used when you go to the off-road environment or before going out, tire replenishment is also a very good function.

If you are interested in purchasing a jump starter, JA301 jump starter with air inflator. Please CLICK HERE for more details, or purchase.

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