Rick's Free Auto Repair Advice

Car battery voltage chart

Car battery voltage chart — State of charge

You can check your car battery start of charge using a voltmeter, thermometer and this car battery voltage chart.

car battery testing

Set your meter to DC volts. Touch one probe to the positive terminal and the other to the opposite terminal. Record the reading. Then measure the temperature of the battery and compare it to the chart below.

car battery state of charge chart

Car battery voltage must be above 12.2 volts to operate properly

If the voltage isn’t within spec, perform a voltage drop test to determine the condition of the terminal/post connection.

Computers can’t operate at voltages of 9.6 or lower.

car battery voltage drop

Test for voltage drop at the battery terminals and posts.

©, 2020 Rick Muscoplat


Posted on by Rick Muscoplat


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