The above chart gives an indication of what the voltage should be at different states of charge and operating conditions. The figures are based on open circuit readings.
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Specific gravity is read with a hydrometer.
Car battery voltage chart. Proactively testing it or making sure your mechanic does twice a year will help reduce your chances of failure. State of charge 12 volt standard batteries battery state of charge is determined by reading either terminal voltage or the specific gravity of the electrolyte. 12 volts is the standard automotive battery in todays vehicle and each of the battery has 6 cells with a voltage of 21.
Voltages and specific gravity are listed for a 6 volt or 12 volt battery and battery banks of 24 and 48 volts. Pure tyre can supply and fit car batteries to your vehicle at your location in and around norwich norfolk the fact that we are mobile means that if and when your battery lets you down its just one simple phone call to 01603 462959 and we will come and replace your battery at you home or work. 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.
A perfect voltage with the engine running is between 137. Before you do this test yourmechanic will test the car battery to be sure that it has at least a 75 charge. Car battery testing voltage.
The chart is listed below. Car battery voltage chart. Its important to test your battery and electrical system regularly not just when its starting to show signs of weakness.
The density or specific gravity of the sulphuric acid electrolyte of a lead acid battery varies with the state of charge see table below. Measuring your car batterys voltage can be a great way to determine how charged your battery might be. Most retailers offer a simple free five minute battery test.
The table below shows the voltage and approximate state of charge for each type of battery. There is a very big difference when a car battery drops even a small amount of voltage. Battery voltage state of charge table.
This is intended as a guide only as the voltage reading will be effected by the battery age technology and temperature. A fully charged car battery has 126 volts. When a car drops for instance from 126 to 120 there will be 75 difference.
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. Then the voltage of the battery is measured under a load similar to what it takes to start your car. But first a few important notes and caveats.
This type of car battery test measures the ability of the battery to produce current. That is when the deep cycle battery isnt under load and hasnt been under load for a few hours.
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