NOVELTY - A battery cell (3) is inserted from an opening (5) of a metallic battery can (2) that is plugged by a battery lid (4) provided with terminal parts (37, 38) forming electrode terminals (21, 22). Another opening (7) in the opposite side is plugged by its battery lid (8) to form a secondary battery. The terminal parts of the electrode terminals are connected to the electrodes provided at the side of an electrical appliance. The secondary battery has a display portion formed in the battery lids which display residual battery life.    USE - For an electronic appliance such as a digital still camera.    ADVANTAGE - The secondary battery achieves downsizing, lightweight and slimming of the battery main body, provides sufficiency strength and simplifies manufacture. Since the battery lids are made of synthetic resin, manufacturing the battery can is easier and allows the battery can to be formed by cutting through an arbitrary length depending upon the shape of the battery cell so that a degree of freedom for the design is improved. By using the metallic battery can, slimming and insurance of strength are realized at the same time so that the secondary battery meets the requirements of downsizing, slimming and lightweight of an electronic appliance is provided. Since the plastic resin-made lid is used, it is possible to easily form the external shape that serves as an installing end in installing the secondary battery in an installing part of the electronic appliance. By this external shape, the battery is used as a discrimination part for discriminating a function or attribute such as a battery capacity, the necessity of quick recharge, the presence or absence of a residual battery life display function or a control part for controlling the installation against an incompatible electronic appliance.    DESCRIPTION OF DRAWING(S) - The drawing shows the detailed oblique view of the secondary battery.    Metallic battery can (2)    Battery cell (3)    Battery lid (4)    Openings (5,7)    Battery lid (8)    Electrode terminals (21,22)    Terminal parts (37,38)