Correlation Between Capacity and Conductance of VRLA

When the state-of-charge for VRLA was more than (50 %),the internal resistance (or conductance) would not be changeable almost. Only when the state-of-charge was less than (50 %), the internal resistance would become larger obviously. Although the correlation between capacity and conductance might exist for these batteries which state-of-charge was from 0 to (100 %), but this correlation would not exist for on-line batteries which capacity must be more than (80 %). For this reason the state-of-charge or state-of-health for on-line batteries could not be predicted from it’s values of conductance.