US Patent 7091694 Revolving battery reservoir system

A revolving battery reservoir system is disclosed. The revolving battery reservoir system includes a system housing for containing multiple sets of batteries. A housing cap is rotatably mounted on the system housing. A contact rod is provided on the housing cap for contacting a selected one of the multiple sets of batteries responsive to rotation of the housing cap on the system housing. Multiple battery extension springs are provided in the system housing for engaging the multiple sets of batteries, respectively. An electrical device is provided in electrical contact with the multiple battery extension springs and the contact rod.