Lead-acid battery charging theory
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The specific gravity of the electrolyte (measured by means of a hydrometer) is used as an indication of the state of charge of a lead-acid battery. An electrolyte with a specific gravity of 1100 to 1150 is 1.1 to 1.15 times as dense as water. At 1100 to 1150, the cell is completely discharged. When the specific gravity is 1280 to 1300, the ...