Patent ID: 9466860
Filing Date: 2016-10-11
CPC Classification: H01M,H02J,Y02E

Claim Text:
1. A battery pack configured to be attachable to a charger and electrically-powered equipment, the battery pack comprising: a battery that is configured to be chargeable by the charger; a control unit that is configured to monitor a state of the battery to control charges to the battery and discharges from the battery; a power supply circuit that is configured to receive electric power selectively from one of the battery and the charger, and generate a voltage for driving the control unit; and a switch that is provided on a power supply path between the battery and the power supply circuit, the switch configured to be turned on or off by the control unit to thereby connect or disconnect the power supply path, wherein the control unit is further configured to turn off the switch thereby to select the charger as a power supply source to the power supply circuit at least in a case where the battery is not in an overdischarged state and the battery pack is attached to the charger.