Car Battery Charge Voltage Chart

Measuring your car battery s voltage can be a great way to determine how charged your battery might be.

Car battery charge voltage chart. The figures are based on open circuit readings. A perfect voltage with the engine running is between 13 7. Battery voltage state of charge table. The table below shows the voltage and approximate state of charge for each type of battery.

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. A fully charged car battery voltage should be 12 6v or above this is with the engine off. Percentage of charge 12 volt battery voltage specific gravity 100 12 70 1 265. When a car drops for instance from 12 6 to 12 0 there will be 75 difference.

Voltages and specific gravity are listed for a 6 volt or 12 volt battery and battery banks of 24 and 48 volts. As a battery is charged the indicated voltage increases and as discharging occurs the indicated voltage decreases. 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. Voltage while battery is under charge battery state of charge soc in percent battery voltage in vdc 11 5 12 0 12 5 13 0 13 5 14 0 14 5 15 0 15 5 16 0 16 5 10 20 30 40 50 60 70 80 90 100 110 120 rest c 5 c 10 c 20 c 40.

In an ideal case an open circuit voltage of about 12 8 v is measured with a multimeter. A fully charged car battery has 12 6 volts. If the voltage falls below 12 4 v the battery should be recharged as soon as possible. A measuring device which can only measure the state of charge of the battery is suitable to test a conventional car battery.

12 60v to 12 80v fully charged battery perfect for fitment to vehicle. 12 volt lead acid battery state of charge soc vs. 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. The actual open circuit voltage of a 100 charged battery is between 12 70v and 12 80v because each cell is approximately 2 13v.

That is when the deep cycle battery isn t under load and hasn t been under load for a few hours. A 12 volt battery contains 6 x 2 volt cells but 12v is the nominal voltage. Battery voltage reacts highly to charging and discharging. A guide for 12v car commercial leisure and marine batteries.