Battery pack

A battery pack, comprising:

• a battery including a plurality of battery cells;
• a first pack terminal and a second pack terminal, each disposed to be connected to a charger;
• a cut-off switch arranged on a path through which charge and discharge currents of the battery flow;
• and
• a battery manager configured to monitor a state of the battery and to turn off the cut-off switch when there is a risk of the battery being damaged, and configured to determine whether the charger is a dedicated charger,
• wherein:
• the battery manager is configured to operate in a first charge mode when it is determined that the charger is not the dedicated charger,
• the battery manager is configured to operate in a second charge mode, different from the first charge mode, when it is determined that the charger is the dedicated charger,
• the battery manager is configured to, in the first charge mode and the second charge mode, initially permit charging of the battery with the cut-off switch in a turn-on state,
• in the first charge mode, the cut-off switch is in a turned-off state when a pack voltage that is a voltage between the first pack terminal and the second pack terminal is greater than or equal to a first reference voltage,
• in the second charge mode, the cut-off switch remains in the turn-on state when the voltage between the first pack terminal and the second pack terminal is greater than or equal to the first reference voltage, and
• in the second charge mode, when the voltage between the first pack terminal and the second pack terminal reaches the first reference voltage, the battery manager transmits information to the charger to notify the charger to complete charging of the battery.