Abstract: A cell system using air as a positive-electrode active material and a metal substance as a negative-electrode active material includes a thin film of the metal substance, a pair of reels, each end being connected to the thin film, an electrode positioned in a vicinity of a path of the thin film between each of the reels, and a molten solution that is positioned downstream of the electrode and melts the metal substance oxidized when power is generated. The metal substance may include, for example, magnesium, aluminum, zinc, lithium and iron, the electrode may include a copper electrode, and the molten solution may include a hydrochloric acid solution, a sulfuric acid solution and an acetic acid solution. The cell system includes the pair or reels to which the thin film is connected, where the pair of reels may be configured by a cartridge type.