Patent ID: 7394220

Claim:
A mobile battery charging pack comprising: a casing, said casing comprising a front wall and a rear wall arranged at front and rear sides thereof, at least one first locating groove and at least one second locating groove symmetrically formed on the inside near two distal ends, and at least one positive electrode and at least one negative electrode respectively mounted in said at least one first locating groove and said at least one second locating groove; a battery set mounted in said casing and electrically connected between said at least one positive electrode and said at least one negative electrode; a cover adapted to close said casing, said casing defines a chamber between said rear wall and said positive and negative electrodes, said chamber comprising at least one power input/output terminal respectively electrically coupled to said at least one positive electrode and said at least one negative electrode for output of battery power supply from said battery set to an external electronic device connected thereto and for input of external power supply means into said battery set selectively, said at least one power input/output terminal including a USB (Universal Serial Bus) connector; a circuit board electrically coupled between a first power control switch and said at least one power input/output terminal, said first power control switch is a three-step switch, which allows charging of said battery set with an external DC power supply when switched to a first position, allows output of the battery power supply from said battery set to said at least one power input/output terminal intermittently when switched to a second position, and allows discharging of the battery power supply from said battery set to an external electronic device being connected to said at least one power input/output terminal; and a second control switch electrically coupled to said at least one power input/output terminal and said positive and negative electrodes, said second control switch being a four-step switch for controlling different connection modes between said battery set and said at least one power input/output terminals.