A handheld electronic device cradle (300) with heat-dissipating capability is provided. The cradle is used for charging a build-in battery in a handheld electronic device (380) and connecting the handheld electronic device to a host computer so that the ha...

A circuit and operating method for an integrated interface of a PDA and a wireless communication system are disclosed. The circuit includes a PDA-turn-on-wireless-communication-system signal line, a PDA-reset-wireless-communication-system signal line, a PD...

A screw (106) and a nut (108) of a spare battery device (104) and a portable device (102) are adjusted and coupled so that output and input contact pads of the two devices are suitably coupled to supply power from the spare battery device to the portable d...