How Many Volts In A Car Battery. An open circuit voltage check that yields 123 volts means that the battery is at a state of 50-75 charged. The modern standard worldwide is 12V but this parameter is changeable.
How many volts should a car battery lose overnight. In a running engine the voltage reading should be between 135 to 147v and a reading higher or lower than this means there are possible problems with the battery or the alternator. The battery needs a certain voltage to charge and maintain charge generally over middle 13 volts in a lead-acid 12 volt system.
When the engine of your vehicle is running the voltage of your car battery should be between 135 and 147 volts.
That is the full capacity of an alkaline battery but when it reach about 14 volts it will be considered dead. A battery with all six cells in good shape that reads 11 volts however would almost. Watts infers the voltage times amp-hours. To get a true voltage reading of the cars battery it is important to measure the voltage after the car has been sat for a period with the engine off preferably overnight this provides you with the car battery open circuit voltage or also know as the resting voltage.
