A solar-powered device (1) is adapted to be disposed on a battery unit of a mobile telephone handset so as to charge the battery unit (3). The solar-powered device includes a light sensor, a photoelectric converting circuit coupled operably to the light se...

A device for charging a battery unit of a mobile telephone handset includes an electric field generating unit (1) for generating an electric field, and a charging current generating unit adapted to be disposed on the mobile telephone handset. The charging ...