Patent ID: 7161326

Claim:
A battery powered electrical device composed of a battery pack and a device's main body detachably holding said battery pack to be powered thereby, said device comprising: a case provided in said battery pack for accommodating at least two battery modules each comprising a plurality of battery cells connected in series; a switching means provided on a side of said case, said switching means selectively closing and opening a series electrical connection of said at least two battery modules, an output terminal formed on said case, said output terminal applying a series-connected voltage of said at least two battery modules to said device's main body upon closing said switching means, an actuator provided on a side of said device's main body, wherein said switching means is provided on an electric pathway between said at least two battery modules, and cooperates with said actuator to establish said series electrical connection when said case is attached to said device's main body, and to interrupt said series electrical connection when said actuator is detached from said case.