Manganese dioxide lithium button cells with high energy density and excellent discharge characteristics. Suitable for various applications such as smart access systems or TPMS (Tire Pressure Monitoring System) for automobiles, IoT devices, backup power source for storage, etc. Specially prepared manganese dioxide (MnO2) is used as the active cathode material and high-strain, high-activity lithium metal is used as the active anode material. The electrolyte is lithium salt fused into an organic solution to ensure easy transfer of high voltage and high energy to the outside.