The viscosities of the posolyte and the negolyte are notably influenced by the total vanadium concentration and temperature . Li et al. compiled the most extensive database of viscosity values for varying SoC and temperature, using 1.6 M and 1.8 M vanadium concentration in 2.6 M and 2.7 M sulphuric acid solutions, respectively. However, this research did not include measurements for fully charged/discharged electrolytes, nor did it explore the combined influence of vanadium and sulphate concentrations.