Patent ID: 8487476

Claim:
A direct current powered mobile device power supply apparatus, including: an external power source coupling module, the external power source coupling module including at least two electrically conductive mechanical elements; an internal electrical storage module, the internal electrical storage module including a storage element storing and discharging electrical energy; a charging module operatively coupled to electrical storage module and operatively coupled to the external power source coupling module, the charging module charging the storage element; a direct current interface module; a switching module operatively coupled to electrical storage module, operatively coupled to the direct current interface module, and operatively coupled to the external power source coupling module, the switching module providing energy from the electrical storage module to the direct current interface module as a function of the energy provided from the external power source coupling module; a transformer module, the transformer module operatively coupled to the external power source coupling module and the switching module, the transformer module transforming alternating current to direct current; and a plurality of user perceptible signal generation modules, the signal generation modules providing an indication of the energy level of the internal electrical storage module.