BATTERY PACK AND ELECTRIC APPARATUS USING BATTERY PACK

Provided is a battery pack in which the connection state of a plurality of battery cells can be switched, the battery pack enabling stable operation of a controller for controlling the discharge of the battery pack. In addition, in a battery pack in which the output voltage is switchable, voltage balance between the plurality of cell units is achieved. A battery pack 100 comprises cell units 146, 147 in which upper and lower battery cells are connected in series, wherein an output of series-connection and an output of parallel-connection can be switched. The cell units are respectively provided with protection circuit ICs 300, 320 for monitoring the state of the battery cells, and only the protection circuit 320 on the lower cell unit side is provided with a controller 350 including a microcomputer. To adjust the power consumption for the microcomputer only provided in the lower cell unit, the circuit on the upper cell unit 146 side is provided with a current consumption control means 310 including dummy loads R31, R34. The current consumption control means 310 is operated in conjunction with the start-up of the microcomputer in the controller 350 so as to equalize power consumption on the upper cell unit 146 side and the lower cell unit 147 side.