is necessarily large. Thus, the conductance ratio is more significant on the full cell fitness relative to the fitness of the non overpotential dominant electrode Ŵnd . The larger differential conductances during intercalation in the cathode, as seen in Fig. , result in higher sensitivity in the cell fitness when discharging, where the non overpotential dominant cathode is intercalating, relative to charge. Unlike the overpotential dominant electrode, when degradation parameters are at the non overpotential dominant electrode, the cell fitness is dominated by the conductance ratios in the cell and not the fitness of the non overpotential dominant electrode. This elucidates the difficulty in resolving degradation mechanisms at non dominant electrodes.