Patent ID: 7647511

Claim:
A data processing apparatus charged by a battery charger which has a terminal, comprising: a first data processing unit including a first battery and a first power supply terminal for being electrically connected to the terminal of the battery charger to supply power to the first battery; and a second data processing unit including a second battery and a second power supply terminal for being electrically connected to the terminal of the battery charger to supply power to the second battery, said second data processing unit being removably attached to said first data processing unit, wherein the first and second power supply terminals are disposed on said first and second data processing units, respectively, such that the first and second power supply terminals are selectively connected to the terminal of the battery charger in accordance with the orientation of said first and second data processing units with respect to the battery charger when said first and second data processing units are attached to each other and mounted on the battery charger.