Solid polymer electrolyte has been prepared with the combination of PVP (poly vinyl pyrrolidone) and magnesium sulfate heptahydrate (MgSO4 center dot 7H(2)O) by solution cast technique and subsequently characterized for possible polymer battery application. Structural studies were carried out by XRD technique. DSC analysis revealed that the micro-porous polymer membrane is thermally stable up to 300 A degrees C. The surface morphology of the films was analyzed by SEM. Electrical conductivity was performed using AC impedance analyzing technique in the frequency range from 4 kHz to 5 MHz. Complex impedance spectroscopy revealed that the enhancement in electrical conductivity by salt doping and the conductivity maximum was obtained for 15 wt% of MgSO4 center dot 7H(2)O salt concentration. Optical absorption studies were carried out on to the prepared films in the wavelength range 200-600 nm. Solid-state polymer battery has been fabricated with the configuration of Mg+/(PVP + MgSO4 center dot 7H(2)O)/(I-2 + C + electrolyte) and discharge characteristics were studied for a constant load of 100 k Omega. The cell parameters like open-circuit voltage, short circuit current, energy density and power density were calculated.