Patent ID: 7804275
Filing Date: 2010-09-28
Classification: G06F

Abstract:
1. A battery power supply apparatus for providing operating voltages to an electronic device, the apparatus comprising: a first rechargeable battery having a first input terminal held at ground potential and a first output terminal held nominally at +3.3 volts DC; a second rechargeable battery having a second input terminal common with the first output terminal and a second output terminal held nominally at +5 volts DC; a third rechargeable battery having a third input terminal common with the second output terminal and a third output terminal held nominally at +12 volts DC; a fourth rechargeable battery having a fourth input terminal common with the first input terminal and a fourth output terminal held nominally at −5 volts DC; a fifth rechargeable battery having a fifth input terminal common with the fourth output terminal and a fifth output terminal held nominally at −12 volts DC; and a battery charger having an input terminal adapted for receiving an AC voltage and three charger terminals including a first charger terminal pinned to ground potential, a second charger output terminal providing a +12 volts DC charging current, the second charger output terminal interconnected for current flow with the third output terminal of the third battery; and a third charger output terminal providing a −12 volts DC charging current, the third charger output terminal interconnected for current flow with the fifth output terminal of the fifth battery; whereby, with the apparatus interconnected with the electronic device, the first, second, third, fourth and fifth rechargeable batteries provide output voltages for operation of the electronic device, and the battery charger continuously maintains charge in the rechargeable batteries.