Patent ID: 6911804

Claim:
A mobile information apparatus ( 10 ) comprising: (A) a battery storage section ( 2 ) including a rechargeable battery ( 21 ); (B) a power supply section ( 1 ) for converting electric power provided by one of an external power supply (A) and said rechargeable battery ( 21 ) to direct current power, and charging said rechargeable battery ( 21 ) with electric power provided by said external power supply (A); (C) a schedule recording section ( 4 ) for recording a user's schedule; (D) a charge-state optimization planning section ( 5 ) for determining a plan for the optimization of the charge state of said rechargeable battery ( 21 ) according to said schedule; and (E) a power-supply control section ( 3 ) for establishing charge and discharge conditions based on said plan for the optimization, and, on the charge and discharge conditions, controlling the charge and discharge of said rechargeable battery ( 21 ) by said power supply section ( 1 ).