How normal is the voltage of the car battery?

The voltage of 12V battery of general automobile should be around 12.8V (plus or minus 0.3V) when it is turned off. If the voltage is lower than 12.5V, it is necessary to replenish the battery in time, and the main voltage of 13.7V should be impossible, unless it is a virtual voltage just detected by flameout. Check after a few minutes or turn off the headlights for a few seconds.

Maintenance-free battery with normal voltage between12v and14.438+0v;

For lead-acid batteries, the normal voltage is between 12 volts and 14.7 volts.

Even in the flameout state, as long as the voltmeter you use is ok and the measured voltage is within the above range, there is no problem.