These experimental data encompass electrolyte densities and conductivities for varying concentrations (from 1 M to 2.5 M) of ZnSO 4 and MnSO 4 , different proportions (0 to 30 wt. %) of organic additives EG and GI, at various temperatures (253 K, 273 K, 298 K, 333 K), totaling about 140 data points. We selected approximately half of them for the training of FF and half as testing set. All data are available in supplementary information.