The Battery was fabricated as metal/cathode/electrolyte/anode/metal. Li_1.3Al_o.3Ti_1.7 (PO4)3 based on NASICON framework (LATP) was used as the solid electrolyte with high ionic conductivity. The LiMn2O4 thin film, which was used as cathode as well as anode electrode, was prepared by spray pyrolysis technique. Structural characteristics, using X-ray diffraction, showed that the best quality LiMn2O4 film is obtained at substrate temperature of 500℃ and flow rate of 15 L/min with annealing at 500℃ for 10 hr. The electrical investigations were carried out using potentiostatic measurements and the performance by charge-discharge test as well as Ragone plot. The best performance (high power and high energy) was achieved for electrolyte of the maximum ionic conductivity prepared at temperature of 950℃.