Intermolecular interactions of Mixed organic electrolytes formed by the combination of Tetrahydrofuran (THF) and Propylene carbonate (PC) solvents with Magnesium Perchlorate salt were studied. The mixtures were prepared and characterized for their physical and thermodynamic properties. These properties include density, viscosity, conductivity, dielectric constant, Grunberg and Nissan d parameter and Critical distance for ion pair formation, . The cells of Mg2+ ion containing electrolytic solutions of the binary mixtures were also studied. Jones –Dole viscosity/concentration dependence plots were made, and the ion-ion interaction coefficient (A) and the ion-solvent interaction coefficient (B) were determined. Molar conductivity measurements investigated at 250c demonstrated that the mixed systems exhibit a wide electrochemical stability window than the pure solvents. The properties of the mixed electrolytes were affected by ion-solvent and solvent-solvent interactions. The results have been interpreted on the basis of the intermolecular interactions among the component molecules of the systems. The temperatures studied show that the battery remains stable even at high temperatures. The mixing ratio of the organic solvents for optimal battery performance is established to be between 75-85%THF for the system.