a reusable period of a battery can be maintained for a long time by recharging while avoiding abnormal heating of the battery due to over discharge . a battery protection circuit comprises a control part that cuts off a discharge switch which is a discharge path to a load for a battery when a voltage value of the battery is equal to or less than a first threshold value , or when the voltage value of the battery is less than the first threshold value , wherein the control part cuts off a power switch as a power supply path to the control part itself when the voltage value of the battery is equal to or less than a second threshold value , or when the voltage value of the battery is less than the second threshold value which is lower than the first threshold value .