A battery pack includes a plurality of rechargeable batteries, a sensor, and a battery manager. The sensor obtains motion information of the rechargeable batteries. The motion information includes at least one of first information obtained by sensing whether the rechargeable batteries are in a movement state or in a standstill state or second information on a state in which the rechargeable batteries are inclined. The second information may be obtained based on a change in angle when the rechargeable batteries are in the movement state. The battery manager control charging or discharging of the rechargeable batteries in a charge mode or a discharge mode based on the motion information.