A battery having a height, a width, a length, top and bottom surfaces substantially perpendicular to the height direction, first and second side surfaces (11c, 11d) disposed between said top and bottom surfaces, and front and rear end surfaces disposed between said top and bottom surfaces and also disposed between said first and second side surfaces, said battery comprising: a terminal area provided at a junction of the front end surface and the bottom surface and having a first surface raised from the front end surface in the length direction and a second surface offset from the bottom surface in a direction of the top surface in the height direction, the terminal area positioned at a position biased to one side with respect to center lines in a width direction and a height direction; a first concave portion stretching between the first side surface and the bottom surface are formed on the front end surface; a second concave portion stretching between the second side surface and the bottom surface are formed on the front end surface; wherein the terminal area having a plurality of inside slits having a negative terminal, a control terminal, and a positive terminal in the inside slits in this order from the center line in the width direction, and a plurality of outside slits located at opposite ends of the inside slits in the width direction, the outside slits are formed wider in the width direction and larger in the height direction than the inside slits, the outside slits engage with guide protrusions at a bottom face of a battery housing of an apparatus when the battery is housed in the battery housing; the terminal area is separated from the first and second concave portions by the front end surface in the width direction; the depth of the first concave portion in the length direction closer to the terminal area in the width direction is shallower than the depth of the second concave portion in the length direction further from the terminal area in the width direction; the depth of the second concave portion in the length direction is larger than the distance in the length direction that the first surface of the terminal area is raised from the front end surface; and the height of the battery is smaller than the width and the length of the battery, the width of the battery is smaller the length of the battery. a terminal area provided at a junction of the front end surface and the bottom surface and having a first surface raised from the front end surface in the length direction and a second surface offset from the bottom surface in a direction of the top surface in the height direction, the terminal area positioned at a position biased to one side with respect to center lines in a width direction and a height direction; a first concave portion stretching between the first side surface and the bottom surface are formed on the front end surface; a second concave portion stretching between the second side surface and the bottom surface are formed on the front end surface; wherein the terminal area having a plurality of inside slits having a negative terminal, a control terminal, and a positive terminal in the inside slits in this order from the center line in the width direction, and a plurality of outside slits located at opposite ends of the inside slits in the width direction, the outside slits are formed wider in the width direction and larger in the height direction than the inside slits, the outside slits engage with guide protrusions at a bottom face of a battery housing of an apparatus when the battery is housed in the battery housing; the terminal area is separated from the first and second concave portions by the front end surface in the width direction; the depth of the first concave portion in the length direction closer to the terminal area in the width direction is shallower than the depth of the second concave portion in the length direction further from the terminal area in the width direction; the depth of the second concave portion in the length direction is larger than the distance in the length direction that the first surface of the terminal area is raised from the front end surface; and the height of the battery is smaller than the width and the length of the battery, the width of the battery is smaller the length of the battery.