An important advantage of using on-line NMR to study electrolyte crossover and degradation is that the impacts of battery state-of-charge can be investigated. Indeed, the battery state-ofcharge can be tracked by measuring the change of the solvent chemical shift. As ferricyanide (i.e., the charged form of ferrocyanide) is paramagnetic, the bulk magnetic susceptibility of the solution depends on its concentration in solution. The concentration of ferricyanide can then be calculated from changes in solvent chemical shift using the well-established Evans' method. This gives on-line NMR the unique advantage of being able to quantify both ferricyanide and 2,6-DHAQ concentrations simultaneously. In this work, we exploit this advantage to investigate the impact of crossover on battery degradation at different stages of charge. We find that anolyte crossover causes side reactions in ferrocyanide electrolytes at high state-of-charge, evidenced by losses in ferricyanide and anolyte concentration, as measured by 1 H NMR. These processes are highly dependent on the composition of the anolyte and can be mitigated by avoiding the use of hydroxyl-functionalized anolytes. The results presented herein suggest that the impact of crossover in anthraquinone/ferrocyanide batteries may have been underestimated in the AORFB field.