What Voltage Should A Car Battery Have. But the voltage is not a fixed number. One way is to test the voltage of the battery under load for example with the headlights on.
During that time the alternator of your vehicle is busy charging the battery. Get the Battery You Need Today. Average car battery voltage is 12-volt DC batteries.
In fact there is a whole car battery voltage chart and if you want to know about the overall condition of the battery a voltage test seems to be the right option.
When the engine of your vehicle is running the voltage of your car battery should be between 135 and 147 volts. Fully-charged most car batteries will measure at least 126 volts 130-132V for OPTIMA YELLOWTOPs but low voltage doesnt necessarily equal a bad battery. It tells you the voltage between the battery terminals. If your voltmeter is showing a voltage anywhere between 124 and 128 that means your battery is in good shape.
