Patent ID: 8836278

Claim:
An electrical device, comprising: a body having a portion formed with a circumference extending about an axis; a rechargeable battery housed within the body; a first connection circuit in connection with the rechargeable battery disposed within the body; and a removable cap adapted to fit over and at least partly surround the body portion, the cap including: an integrally formed secondary winding surrounding the body portion about the axis, the secondary winding being adapted to receive magnetic flux extending from a planar charging surface; a layer of magnetic material disposed between the secondary winding and the body portion for reducing current induced in the body of the electrical device; and a second connection circuit for connecting the secondary winding to the first connection circuit so as to charge the rechargeable battery in the body; wherein the cap is arranged to be in contact with the planar charging surface and to support the electrical device on the planar charging surface during charging of the electrical device; and wherein the secondary winding is arranged to be substantially parallel to the planar charging surface so that lines of magnetic flux extending from the planar charging surface pass substantially perpendicularly through the secondary winding during charging of the electrical device.