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6 x 2.1 v = 12.6 v |
| The standard automotive battery in today's vehicles is 12 volts. Each battery has six cells with 2.1 volts. A car battery is considered fully charged at 12.6 volts. |
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When a battery drops voltage, even a small amount, it makes a big difference. For instance, when a battery drops from 12.6 to 12.0 volts, its power drops from 100% to 25%.
At 12.4 volts, a car battery is 75% charged. At 12.2 volts, it's 50% charged.* |
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A car battery is considered charged at 12.4 volts or higher.
It is considered discharged when it's at 12.39 volts or less. |
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*A fully charged specific gravity of 1.265 corrected to 80°F
is assumed. |
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