A battery charging cradle and mobile electronic device include a battery charging cradle incorporating a primary coil which induces an AC magnetic flux to a specific portion of a planar, top plate of the cradle, and a rechargeable battery incorporated inside a bottom plate and charged by electric power which is induced to a secondary coil being electromagnetically coupled to the primary coil. The battery charging cradle has a positioning portion, so that the mobile electronic device is placed in a predetermined position by means of the positioning portion, the primary coil is electromagnetically coupled to the secondary coil, and thus the rechargeable battery incorporated in the mobile electronic device is charged.