Abstract: Distributed power regulation in a handheld device is provided. A system for power regulation in a handheld electronic device having a battery, includes: an expansion interface for receiving a battery power from the battery; and a peripheral interface system releasably coupled to the expansion interface and communicating with a peripheral device for generating one or more predetermined operation powers for the peripheral device, based on the battery power provided through the expansion interface.

Abstract: A client-host detection device for detecting connecting a connected peripheral is disclosed herein. The device comprises a peripheral sensor connected to a terminal, a terminal sensor connected to or for connection to a peripheral and a terminal electrical connector connected to the terminal for electrical connection with a peripheral electrical connector connected to a peripheral. The peripheral sensor is positioned to sense the terminal sensor upon connection of the terminal electrical connector with the peripheral electrical connector. The device allows for an electrical connector to be maintained in an unpowered state unless a peripheral is connected thereby reducing or preventing de-plating of the contacts of the electrical connector caused by conductive solution across the contacts as a result of the voltage on the connections. The device also allows for the use of an unpowered peripheral.