How Many Kilowatt-Hours Does a Car Battery Have?
1 Answers
Car batteries are typically 12 volts and 60 ampere-hours. The calculation method for electricity consumption per charge is: 12 volts × 60 ampere-hours = 720 watt-hours. Considering the charging efficiency, multiply by a factor of 1.1: 720 × 1.1 = 792 watt-hours = 0.792 kilowatt-hours. When a passenger car's battery is parked normally, the voltage is generally above 13.4V (in a state where it can start smoothly). As the parking time increases, the voltage will decrease. The reasons are: A car battery loses about 1% of its charge daily. If it remains connected to the car without being removed, the car uses a minimum current (commonly known as "sleep" current) of about 80mA to maintain it. If there is an anti-theft alarm, it will also consume some power. Generally, about 2~3% of the battery's charge is consumed daily. When the battery charge is below half, i.e., the voltage is below 13.4V, the battery fault light will come on, and the car will be difficult to start. In this case, the battery should be fully charged once every two weeks. If the battery voltage is 10% lower than the rated voltage, i.e., below 10.8V, the battery is at risk of being undercharged. In this case, it should be fully charged once a month. Car battery charging method: Turn off the engine and remove the battery from the car. Adjust the battery's liquid level to the specified height using distilled water or a special battery replenishing liquid. Connect the battery to be charged according to the rated voltage and current specified by the charging equipment. Remember that the total voltage of the battery must not exceed the rated voltage of the charging equipment. Choose the charging current size for constant current charging based on the battery's capacity. Because the battery has been used, it should be charged slowly in two stages: the charging current in stage one is one-tenth of the battery's rated capacity, and the charging current in stage two is one-twentieth of the battery's rated capacity. Plug in the charger, attach the red clamp of the charger to the battery's positive terminal marked with a plus sign, and the black clamp to the battery's negative terminal marked with a minus sign. Turn on the switch to start charging. Generally, the charging time should not exceed 12 hours. After charging, check whether the density of the battery's electrolyte meets the requirements. If it does not, you can first pour out a small amount of the original electrolyte. If the density is too low, add a concentrated electrolyte with a higher relative density; if the density is too high, add distilled water to dilute it until the liquid level reaches the specified height.
