Car Battery Voltage

Car battery voltage chart range.

Car battery voltage. Hook up a voltmeter to the car s battery by connecting the red lead to the positive terminal and the black lead to the negative terminal. When a car drops for instance from 12 6 to 12 0 there will be 75 difference. A lot of people think a discharged battery has a measure of 0 volts but that s typically not the case. Proactively testing it or making sure your mechanic does twice a year will help reduce your chances of failure.

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. Car battery testing voltage. A fully charged car battery voltage should be 12 6v or above this is with the engine off. A fully charged car battery voltage without being plugged into an external device ranges from 13 7 to 14 7 volts.

12 volts is the standard automotive battery in today s vehicle and each of the battery has 6 cells with a voltage of 2 1. Before you do this test yourmechanic will test the car battery to be sure that it has at least a 75 charge. If the battery is in good condition the voltage will read between 12 4 and 12 7 volts. A perfect voltage with the engine running is between 13 7 and 14 7v.

Most retailers offer a simple free five minute battery test. With the engine off you should get a reading of 12 6 volts. 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 battery s current charge. It s important to test your battery and electrical system regularly not just when it s starting to show signs of weakness.

A fully charged car battery voltage ranges from 13 7 to 14 7 volts it will drop to 12 4 volts. Battery voltage of charge remaining. Alone about 100 million auto batteries a year are replaced and 99 percent of them are turned in for recycling. The 12 volt car battery is the most recycled product in the world according to the united states environmental protection agency.

It will drop to 12 4 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. However the recycling may be done incorrectly in unregulated environments. To check a car battery turn off the ignition and pop your vehicle s hood.

In fact the voltage measurement between a healthy and dead battery is much narrower than this as you can see from the chart below.