As we extend the half cell model to a full cell, the presence of degradation, characterized by kinetic changes in the electrodes, introduces a shift in the behavior of the system. When the system is degraded, due to the current constraint requirement and the altered kinetics, the same absolute potentials ϕ s,c,a cannot be applied to the cathode and the anode. This discrepancy arises because the equality in current is no longer maintained. To ensure the current constraint is still satisfied on the full cell, there is a necessity for a potential shift ∆ϕ to be applied to both the solid potential at the anode and cathode. Consequently, the voltage in this degraded full cell is calculated as (ϕ s,c + ∆ϕ) -(ϕ s,a + ∆ϕ) = ϕ s,c -ϕ s,a , resulting in the same experimental voltage as previously measured. In short, this shift in potentials at both electrodes is essential to maintain the current constraint in the presence of degradation.