Abstract: An adapter plug system connectable to AC and DC sources for powering an electrically powered device. The system includes an adapter power cord for translating AC or DC voltages into a predefined DC voltage and a DC adapter. The adapter power cord also includes an adapter circuit in a case that translates a received voltage into a voltage acceptable for an attached electrically powered device. The adapter power cord includes a switch for automatically or manually setting the adapter circuit to translate AC or DC voltages. The system also includes a DC adapter that inserts into a vehicle lighter outlet for supplying a DC voltage to plug prong receiving ports.

Abstract: A battery pack (20) holds one or more batteries (118) and connects to a mobile telephone (115). The battery pack includes a case (22) for holding the batteries, a recharging circuit (122) disposed in the case, a plug (86) rotatably connected to the case and electrically connected to the recharging circuit, and electrical terminals 46 mounted to the case. The plug includes a pair of generally parallel, spaced prongs (88). The plug rotates from a first position, having the prongs projecting from the case, to a second position having the prongs retracted into the case. Electrical leads (47) extend from each of the electrical terminals to battery terminals. A pair of contacts (110) and (112) spaced from another, interrupts each of the electrical leads. When the prongs retract, each electrical contact of a contact pair electrically connects to one another through a prong. When the prongs extend, the electrical contacts are disconnected from one another.