A non-aqueous electrolyte secondary cell includes a positive electrode, a negative electrode, and a non-aqueous electrolyte existing between the positive electrode and the negative electrode. The positive electrode contains an active substance capable of occluding and emitting lithium. The negative electrode contains the active substance of the same composition as the active substance of the positive electrode. The non-aqueous electrolyte secondary cell generates voltage when charged. Moreover, upon reflow mounting, charge is performed after mounting, so as to eliminate adverse affect to parts of the substrate.