What is the normal battery voltage?
2 Answers
Normal battery voltage ranges between 11.8V and 12.8V, while the voltage after starting the engine is between 13.2V and 14.8V. As long as the voltage during startup is not lower than 11V, it is considered normal. Both excessively high and low battery voltages can have certain impacts, so it is advisable to regularly check the battery's condition. If the battery voltage drops below 10.8V, it should be charged promptly. Precautions for using the battery: 1. Keep the battery clean and dry, ensuring that the vent holes are unobstructed; 2. Do not use the starter continuously, with each use not exceeding 5 seconds, and allow a rest period of 10 to 15 seconds between two starts; 3. A battery with sufficient electrolyte should not be left in a state of insufficient charge for a long time and should be charged regularly, otherwise it may lead to scrapping.
When I first bought my car two years ago, I was really curious about the normal voltage range for the car battery. Later, I asked an experienced mechanic and learned that the resting voltage should be around 12.6 volts. If it drops below 12 volts, the battery might be aging or discharged. After starting the engine, the alternator kicks in, and the voltage should rise to between 13.7 and 14.7 volts, indicating normal charging. I’ve tested it myself with an inexpensive multimeter—if the voltage falls below this range, starting the car becomes difficult, especially in cold winter weather. I recommend checking the voltage monthly, particularly after long periods of inactivity. An old or deeply discharged battery can lose voltage quickly, so timely maintenance helps avoid roadside breakdowns, saving both money and hassle.
