Car Battery Voltage
A fully charged car battery voltage without being plugged into an external device ranges from 137 to 147 volts.
Car battery voltage. A typical 12 v 40 ah lead acid car battery. When a car drops for instance from 126 to 120 there will be 75 difference. 12 volts is the standard automotive battery in todays vehicle and each of the battery has 6 cells with a voltage of 21. With this method a hydrometer measures battery voltage.
If the battery is in good condition the voltage will read between 124 and 127 volts. 1124 means you have a dead battery. The ideal car battery voltage range will provide you with a relevant interval according to which you can measure precisely what the voltage says about the batterys current charge. Its main purpose is to feed the starter which starts the engine.
Fully charged automotive batteries should measure at 126 volts or above. It will drop to 124 volts when the charge is 75 and 12 volts when it is at 25. There is a very big difference when a car battery drops even a small amount of voltage. A reading of 1229 indicates a 75 charge 1194 is a 50 charge and 1159 is 25 charged.
Hook up a voltmeter to the cars battery by connecting the red lead to the positive terminal and the black lead to the negative terminal. A fully charged car battery voltage should be 126v or above this is with the engine off. When fully charged how many volts should a car battery have. A specific gravity of 1269 means that the battery is fully charged.
A perfect voltage with the engine running is between 137 and 147v. To check a car battery turn off the ignition and pop your vehicles hood. This is the method used for non sealed lead acid batteries. It will drop to 124 volts when the charge is 75 and 12 volts when it is at 25.
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.