What is the specific gravity of a fully charged lead acid battery?

The specific gravity of a fully charged lead-acid battery typically falls within the range of 1.260 to 1.280. A specific gravity measurement of 1.265 reflects a fully charged state for such batteries. This value is important as it indicates the concentration of sulfuric acid in the electrolyte solution, which directly correlates with the battery's state of charge.

Values outside of this range suggest varying states of charge or conditions of the battery. Therefore, 1.265 is recognized as the correct and standard specific gravity for a fully charged lead-acid battery, serving as a key reference point for technicians evaluating battery performance and health.