Charge state determining method for motor vehicle, involves determining charge state with relation or from data table providing charge state according to no-load voltage and volume of water which is lost

摘要

The method involves measuring a no-load voltage of a lead-liquid acid battery, and evaluating volume of water that is lost by electrolysis during battery life. The charge state is determined with a relation or from a data table providing the charge state according to the no-load voltage and the volume of water which is lost. The volume of water is evaluated from the mass of the battery when the battery is powered.