Abstract: A portable telephone comprises: a battery pack detachable from a portable telephone body, the battery pack including: a recess in a head section thereof; a hook formed in a bottom section thereof; and a back protrusion on the back of said head section, the portable telephone body includes: a bottom recess engageable with said hook; a slide pawl engageable with said recess in the head section of the battery pack; and a slide protrusion which is integral with the slide pawl, and which, when the slide pawl is slid, is slid and brought into contact with the back protrusion, thereby to forcibly push the head of the battery pack out of the electronic device.

Abstract: A battery pack that reduces thickness and lightens weight as required for battery power sources of portable electronic equipment. A battery pack is constituted by accommodating a battery and battery protection device between a top case and bottom case forming a pack case. Since the battery is formed accommodated within an external casing wherein positive and negative electrode plates are formed by laminated sheet, reduced thickness and reduced weight of battery pack can be achieved. Also, since the face of bottom case opposite the battery is formed as a resiliently deformable face which is formed of small thickness, when expansion takes place such that the thickness of the battery as a whole increases, resiliently deformable face deforms maintaining a planar condition by resilient deformation, so that there is no possibility of an adverse effect on the equipment due to drum-shaped swelling being produced in battery pack, by such swelling.

Abstract: In a battery pack, pitfalls are provided at both end portions in the width direction of a rear surface lower portion of a portable phone main body. Projections higher than the electrode pins are provided at both ends in the width direction of a lower surface lower end portion of the battery pack at the position corresponding to the pitfalls. Grooves or a gap for guiding the projections are provided at both end portions in the width direction of the rear surface of the portable phone main body. In mounting the battery pack in the portable phone, the projections are contacted with the rear surface of the portable phone so that the battery pack slides to the lower side of the portable phone main body with the projections guided along the grooves gap. When the projections drop in the pitfalls after the tip of the battery pack passes above the pins, the pins are forced against the electrode of the battery pack according to the force of a biasing spring so as to be connected electrically in a conventional manner.

Abstract: There is provided a battery pack with a water leakage detecting seal comprising a protective circuit 5 for protecting a battery, a first case 6, a second case 7, and a battery cell 8, characterized in that the water leakage detecting seal 2 is arranged adjacent to the protective circuit 5 for protecting the battery in the rear of a window 3 formed in the first case 6 in such a way that the water leakage detecting seal 2 is sandwiched between the first case 6 and the second case 7.