The car battery voltage is generally 12V, and the 12V voltage is not fixed. Under normal circumstances, the battery voltage before starting the car is between 11.8V-12.8V, and the battery voltage after starting is between 13.2-14.8V. If the battery voltage is lower than 11.8V, it indicates that the voltage is insufficient; if the voltage is lower than 10.8V, it indicates that the battery is running low.
The battery voltage will affect the normal use of the car. If the battery voltage is too low, the car will be difficult or even unable to start; if the battery voltage is too high, the battery may be damaged. The battery voltage should be checked at ordinary times. If the battery voltage is insufficient before the car starts, when it is lower than 11.8V, the car will have difficulty starting, and the electrical equipment should be turned off to start the car for charging. Once the battery voltage is lower than 10.8V, it indicates that the battery is running low and the car will not be able to start. At this time, you need to use a charger to charge. If the battery has been used for a long time and the power loss is serious, the charger will be difficult to charge. It is recommended to replace it directly.
The reason for the lack of power in the car battery is usually caused by forgetting to turn off the on-board electrical appliances after getting off the car, and there are also some reasons for the malfunction of the generator or the battery. Therefore, reasonable use is needed to extend the battery life. Generally, the normal service life of the car battery is 2-3 years. If the car is parked for a long time, the car needs to be started regularly to allow the car to run at idle for a period of time to charge the battery. It is recommended to remove the negative pole of the battery when parking to avoid battery power shortage.
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