Patent ID: 7477039

Claim:
An apparatus, comprising: at least one device from a set of devices consisting of: (a) a portable electrical device capable of storing electrical energy and requiring periodic recharging, and (b) a charging device for supplying electrical energy to said portable electrical device during recharging thereof; wherein said portable electrical device and said charging device comprise respective complementary mating surfaces which transmit electrical energy from said charging device to said portable electrical device during recharging of said portable electrical device, said respective complementary mating surfaces having respective central axes, said respective complementary mating surfaces being in an aligned configuration opposing each other in which said central axes are substantially coincident during recharging; and wherein said portable electrical device is placed upon said charging device by a user, said portable electrical device aligning its mating surface with respect to the mating surface of the charging device automatically by inducing motion in at least one dimension perpendicular to the central axis of said mating surface of said charging device using a gravitational force, said complementary mating surfaces being shaped to use said gravitational force to automatically induce motion in said at least one dimension perpendicular to the central axis of said mating surface of said charging device to automatically align said complementary mating surfaces with respect to each other.