What is the voltage of a general car battery?

2 Answers
DiChristian
07/24/25 6:37am
Generally, a car battery is 12V, but in reality, it may be slightly higher. The no-load voltage is around 13V, and the load voltage should not be lower than 11V. If it falls below this voltage, it may cause difficulty in starting the car. The battery can be charged by the alternator while the car is running. If the car is parked for an extended period, it can easily lead to battery drain, making it difficult to start the car. The battery is an essential part of a car, providing power to the starting system, lighting system, and other electronic components. During long-term parking, it is recommended to start the car at least once a week for more than 5 minutes to charge the battery. Additionally, it is advisable to disconnect the negative terminal of the battery when the car is parked for a long time to avoid complete battery discharge.
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DiMadeline
08/11/25 2:24am
I've always been interested in this topic. Car batteries typically have a standard voltage of 12 volts. This specification became mainstream since the 1960s because 6-volt systems couldn't meet the demands of modern equipment, such as higher starting currents. When stationary, the battery voltage should be between 12.4 to 12.7 volts. If it drops below 12 volts, starting difficulties may occur. Low voltage often indicates battery aging, insufficient charging, or alternator issues, with risks exacerbated during cold winter temperatures. If the measurement shows below 11.8 volts, consider charging or replacing the battery. Battery lifespan is generally 3 to 5 years, and regular inspections can prevent failures. Always wear gloves when handling to avoid short circuits—safety first. This knowledge has helped me solve several breakdown situations.
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