Car Battery Voltage Chart

Proactively testing it or making sure your mechanic does twice a year will help reduce your chances of failure.

Car battery voltage chart. The figures are based on open circuit readings. Therefore if your battery is more than 4 years old and car battery voltage drops quickly it is possible it has reached the peak of its useful service life and requires replacement especially if. The chart is listed below. That is when the deep cycle battery isn t under load and hasn t been under load for a few hours.

But first a few important notes and caveats. 12v car battery voltage chart the average duration a car battery can last is 4 to 5 years or even 3 years in hot climates such as arizona and florida. Voltages and specific gravity are listed for a 6 volt or 12 volt battery and battery banks of 24 and 48 volts. This is intended as a guide only as the voltage reading will be effected by the battery age technology and temperature.

In an ideal case an open circuit voltage of about 12 8 v is measured with a multimeter. Regular testing of electrical systems and batteries is a part of. Then the voltage of the battery is measured under a load similar to what it takes to start your car. A perfect voltage with the engine running is between 13 7 and 14 7v.

With the engine off you should get a reading of 12 6 volts. Before you do this test yourmechanic will test the car battery to be sure that it has at least a 75 charge. 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. It s important to test your battery and electrical system regularly not just when it s starting to show signs of weakness.

Battery voltage state of charge table. But the voltage is not a fixed number. Car battery voltage chart the above chart gives an indication of what the voltage should be at different states of charge and operating conditions. This type of car battery test measures the ability of the battery to produce current.

I put together the following battery state of charge chart which indicates the state of charge percent as it relates to battery voltage or specific gravity. 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. Average car battery voltage is 12 volt dc batteries. The table below shows the voltage and approximate state of charge for each type of battery.

Testing of a conventional wet cell battery. Car battery testing voltage. Most retailers offer a simple free five minute battery test. So how many volts is a car battery the straightforward answer is.