NOVELTY - The apparatus (1) has an electrically-conductive part (21) e.g. bus-bar, connected with batteries i.e. battery cells (5a1-5a4, 5b1-5b4, 5c1-5c4, 5d1-5d4), in series manner and equipped with an electrically-conductive part group (4), which is parallely connected with the batteries. The electrically-conductive part exists in a position of a serial battery group (7A). A pair of an electrode parts e.g. positive-electrode part and negative-electrode part, is connected parallely with an electrode part of each battery by the electrically-conductive part group.    USE - Assembled battery apparatus for use as power supply of a machine and an installation. Can also be used as a moving-type power supplies for mobile body e.g. motor vehicle and bicycle, and a fixed-type power supplies for point of sales(POS) system.    ADVANTAGE - The electrically-conductive part is connected with batteries in series manner, so that efficiency of condition detection of the batteries can be improved and fallen detection accuracy of the batteries can be suppressed.    DETAILED DESCRIPTION - The battery cell is a lithium ion secondary battery. The lithium ion secondary battery is a nickel-hydrogen battery, a nickel cadmium battery, lead acid battery and a nonaqueous electrolyte secondary battery. The lithium ion secondary battery consists of lithium ion, positive electrode material, lithium manganese complex oxide, lithium nickel complex oxide, lithium cobalt complex oxide, lithium nickel cobalt complex oxide, lithium manganese cobalt complex oxide, spinel type lithium manganese nickel complex oxide, lithium phophorus oxide, oxide type material e.g. lithium titanate and carbonaceous material, silicon system material i.e. negative electrode material, and electrolyte solution. The electrolyte solution is included with lithium salt i.e. fluorine-type complex salt organic solvents, ethylene carbonate, propylene carbonate, diethyl carbonate, carbonic acid ethylmethyl and dimethyl carbonate.    DESCRIPTION OF DRAWING(S) - The drawing shows a top view of an electrical storage part of an assembled battery apparatus.    Assembled battery apparatus (1)    Electrically-conductive part group (4)    Battery cells (5a1-5a4, 5b1-5b4, 5c1-5c4, 5d1-5d4)    Serial battery group (7A)    Electrically-conductive part (21)