The combined battery (10) of the present invention includes two end plates (11) and a plurality of general cells (20) stacked adjacent each other and bound by two end plates (11). The general cells (20) are provided with a battery container (22) made of resin, and bound by two end plates (11) with a binding force equal to or lower than a threshold value determined based on the number and the compressibility of the cells (20) and the stiffness of the battery container (22), in such a manner that no more than a predetermined amount of irreversible deformation will be caused in the battery container (22).