Patent ID: 8318334

Claim:
A battery casing for an electrical device comprising: a box body configured for receiving a battery therein, the box body having a first sidewall and a second sidewall opposite to the first sidewall; an electric sheet mounted on an inner surface of the first sidewall, and capable of electrically connecting with a first electrode of the battery; a resilient electric portion mounted on an inner surface of the second sidewall, and capable of electrically connecting with a second electrode of the battery, and compressible to generate restoring forces; and a switch apparatus mounted on an outer side of the first sidewall, the switch apparatus being switchable between a first position and a second position; wherein, the box body defines a through hole running through the first sidewall and the electric sheet, the switch apparatus comprises a moveable member slidable in the through hole, the moveable member is capable of moving towards the resilient electric portion and pushing the first electrode of the battery to detach the first electrode of the battery from the electric sheet, when the switch apparatus is in the first position, the first electrode of the battery is detached from the electric sheet; when the switch apparatus is in the second position, the first electrode of the battery contacts the electric sheet.