An open circuit voltage test helps determine which parameter?

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Multiple Choice

An open circuit voltage test helps determine which parameter?

Open-circuit voltage is measured with no current flowing, so the reading reflects the chemical state of the stored energy in the cells. This makes the voltage a useful indicator of how much charge remains, i.e., the state of charge. When the battery is under load, voltage is influenced by internal resistance and polarization effects, which hide the true remaining charge. Peak current and voltage under load aren’t determined by the open-circuit condition, so they aren’t what this test reveals. Keep in mind the battery should have a rest period to eliminate surface charge and temperature effects for an accurate SOC estimate.

Open-circuit voltage is measured with no current flowing, so the reading reflects the chemical state of the stored energy in the cells. This makes the voltage a useful indicator of how much charge remains, i.e., the state of charge. When the battery is under load, voltage is influenced by internal resistance and polarization effects, which hide the true remaining charge. Peak current and voltage under load aren’t determined by the open-circuit condition, so they aren’t what this test reveals. Keep in mind the battery should have a rest period to eliminate surface charge and temperature effects for an accurate SOC estimate.

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