BATTERY CHARGER APPLICABLE TO MULTIPLE-VOLTAGE SPECIFICATIONS, BATTERY CHARGING SYSTEM, AND BATTERY UNIT

PROBLEM TO BE SOLVED: To charge an electronic apparatus by automatically discriminating the voltage of a battery on the apparatus to be charged and by automatically adjusting a charging voltage. SOLUTION: The electronic apparatus 1 includes the battery 8, a first operation device 6, a first memory 7, and an RFID/IC tag 9. The battery charger 2 includes a second operation device 12, a second memory 13, an IC 14 of a Scanner, and power supply system controlling devices 17 to 20 that make the charging voltage variable. When the electronic apparatus 1 is set in the battery charger 2, the second operation device 12 receives a data corresponding to the charging specifications of the battery 8 via the RFID/IC tag 9 and the IC 14 of the Scanner. A voltage that corresponds to the charging specifications is generated by the power supply system controlling devices 17 to 20 so that the battery 8 is charged via a power transmission coil 22 and a receiving coil 10. COPYRIGHT: (C)2005,JPO&NCIPI