Patent ID: 7728547

Claim:
A battery pack, comprising: a first rechargeable cell to supply power; a second rechargeable cell to supply power, and which is of a different type from the first rechargeable cell; a first switching unit to control supply of power to and/or from the first rechargeable cell; a second switching unit to control supply of power to and/or from the second rechargeable cell, and which is parallel to the first switching unit; and a controller to control the first and second switching units to supply power from the first and second rechargeable cells without interruption, wherein the controller transmits information on the shapes, the chemical characteristics, the capacities, and the charging voltages of the first and second rechargeable cells to be charged during charging operations to a charging circuit so that the charging circuit supplies a suitable charging current based on the information of the first and second rechargeable cells to be charged.