Car battery normal voltage range

The voltage of a car battery should be between 12.2 to 12.6 volts when the engine is turned off. A fully charged car battery voltage falls between 13.7 and 14.7 volts with the engine running. With the battery charge at 75%, the voltage can drop to 12.4 volts. At 25% charged, the voltage will measure around 12 volts.

A car battery is the ultimate source of power for the electronic gadgets inside a car and for the car itself. Therefore, it is believed to be one of the most important components of any vehicle. If your car’s performance isn’t up to the mark, then a low voltage battery may be the reason for it.

Check Car Battery Charging Voltage. You should connect the voltmeter to the battery as before but not the charging voltage and this should be done after charging the battery or jump starting the car. 13.5 to 14.5 or more volts at idle should be produced by a charging system that operates normally.