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A recent Google search on VRLA batteries and conductance showed more than 180 scholarly works on the relation of VRLA performance to conductance or impedance measurements. The degree of study on this topic shows the level of interest of battery manufacturers, equipment manufacturers and battery users on the use of conductance equipment to determine battery performance. The basic claim of conductance and impedance equipment manufacturers is that changes that cause capacity loss, and ultimately, failure in the internal conditions of VRLA batteries can be measured using AC impedance methods. Tracking conductance or impedance therefore will detect capacity loss and failing cells.