Patent ID: 8106624

Claim:
A charging device on which a battery pack including a memory is connected, comprising: a charging current measuring unit that measures a charging current supplied to the battery pack; a charging voltage measuring unit that measures a charging voltage applied to the battery pack; a control unit that detects whether a first data table corresponding to identification data of the battery pack is stored in the charging device, and determines, if the first data table is stored in the charging device, charged state data indicating a charged state of the battery pack based on a charging current measured by the charging current measuring unit, a charging voltage measured by the charging voltage measuring unit, and the first data table; a writing unit that stores the charged state data determined by the control unit in the memory, wherein the control unit generates a second data table by using charging characteristics data stored in the memory if the first data table is not stored in the charging device, the control unit determines the charged state data based on a charging current measured by the charging current measuring unit, a charging voltage measured by the charging voltage measuring unit, and the second data table if the first data table is not stored in the charging device, the control unit causes a display unit to display a charged state of the battery pack determined by using the first data table if the first data table is stored in the charging device, the control unit causes the display unit to display a charged state of the battery pack determined by using the second data table if the first data table is not stored in the charging device, the first data table includes a data table associated with a charging current, a charging voltage, and a charged state data, the second data table includes a data table associated with a charging current, a charging voltage, and a charged state data, and the charging characteristics data includes charging voltage, charging current, full charge capacity ratio, and remaining charge capacity.