This paper presents a new inorganic rechargeable battery system with LiCoO2 as the positive electrode of the battery whereas metallic lithium is plated onto the negative current collector. The electrolyte is based on LiAlCl4 and SO2. The inorganic character of the battery results in a new principle of operation which affords only a limited amount of metallic lithium in the cell. The positive intercalation electrode determines the amount of lithium in the cell in its charged state. Compared to other metallic lithium battery systems, no surplus of lithium is needed. This leads to a safe and reliable accumulator with excellent performing characteristics for electric vehicle and cordless tools applications.