Solid polymer electrolytes based on starch and magnesium sulphate were prepared via a casting method. The solid polymer electrolyte (SPE) films were an amorphous phase and the XRD analyses confirmed the coexistence of peaks for the materials mentioned. The films seemed to be coarse, as clarified by SEM, and the surface was evenly shaped. Sample of 35 wt.% MgSO 4 showed the utmost ionic conductivity (8.52×10 -5 Scm -1 ). The open circuit voltage (OCV) results for the fabricated cells can maintain a voltage of above 1.4 V for 14 days, by using the as-prepared films. The electrochemical preliminary results revealed that the as-prepared SPE has the ability to be employed in all-solid-state zinccarbon battery.