A battery pack including: a rechargeable battery, a protection circuit configured to disable the rechargeable battery when an output voltage value of the rechargeable battery becomes equal to or lower than a first voltage value, and a control circuit configured to stop power supply for an electronic device from the rechargeable battery when the output voltage value of the rechargeable battery becomes equal to or lower than a second voltage value that is higher than the first voltage value, the second voltage value being updated based on the output voltage value of the rechargeable battery when power supply for the electronic device from the rechargeable battery becomes unnecessary.