Patent ID: 7741812

Claim:
An electronic apparatus comprising: a battery being chargeable by applying a charging voltage; a notification unit that notifies information; a storage unit that stores a battery voltage determination threshold value used to determine a remaining charge of the battery; a voltage detection unit that detects a voltage of the battery; a detected voltage write unit that, when a predetermined voltage is applied, stores the voltage detected by the voltage detection unit as the battery voltage determination threshold value; a controller that measures a length of time which the battery has not been charged by executing a timer interrupt process; a notification control unit that determines the remaining charge of battery based on the voltage of the battery detected by the voltage detection unit, the battery voltage determination threshold value stored in the storage unit, and a charging time required to maximize the charge of the battery, and controls the notification unit to make a notification indicating the remaining charge of the battery, wherein the charging time required to maximize the charge of the battery is calculated using the voltage of the battery detected by the voltage detection unit and the length of time over which the battery has not been charged, wherein the charging time required to maximize the charge of the battery is further calculated by adding a discharge time calculated based on the length of time over which the battery has not been charged, to a time corresponding to the voltage of the battery detected by the voltage detection unit when the electronic apparatus is turned on, and wherein the charging time required to maximize the charge of the battery is periodically adjusted based on the voltage of the battery detected by the voltage detection unit.