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.
Fully charged voltage. 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. Battery Storage; Car Battery Testing & Voltage. A fully charged car battery voltage should be 12.6v or above, this is with the engine off. A perfect voltage with the engine running is between 13.7 and 14.7V.
Most retailers offer a simple free five minute battery test. 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”. In that case, the voltage drops to 11.9 V. So, the voltage has to be at least 12 for a car battery to have the functioning capacity. Before you do this test, YourMechanic will test the car battery to be sure that it has at least a 75% charge. A fully charged car battery has 12.6 volts. What is the normal car battery voltage when it runs out of juice? How To Test A Car Battery Voltage.
When a car drops, for instance, from 12.6 to 12.0, there will be 75% difference. There is a very big difference when a car battery drops even a small amount of voltage. This type of car battery test measures the ability of the battery to produce current. Then, the voltage of the battery is measured under a load similar to what it takes to start your car. Proactively testing it (or making sure your mechanic does) twice a year will help reduce your chances of failure.
Using a voltmeter is the easiest way to measure a battery’s voltage … With the engine off, you should get a reading of 12.6 volts. It’s important to test your battery and electrical system regularly, not just when it’s starting to show signs of weakness.