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- Q654 - Electrical, Electronic, & Control Engineering
42. What is the best method of determining the state of charge of a flooded lead-acid storage battery?
The specific gravity of the electrolyte directly indicates the state of charge of a flooded lead-acid battery and is the most reliable method; electrolyte density changes with sulfuric acid concentration during charge and discharge, providing a direct measurement of state of charge, unlike voltage which is influenced by other factors, or ampere-hour capacity which is a design characteristic.
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