Patent ID: 8823327

Claim:
A battery management method of an electrical device, having an internal power source and a battery management unit, the battery management method comprising the steps of: detecting, by the battery management unit, whether the electrical device is electrically connected with an external power source; utilizing, by the battery management unit, a timer to determine whether the electrical device has been electrically connected with the external power source for a predetermined time if the electrical device is electrically connected with the external power source; and resetting, by the battery management unit, the timer and controlling, by the battery management unit, the internal power source to discharge fast if the electrical device has been electrically connected with the external power source for the predetermined time, wherein: if the electrical device was connected to the external power source for a time shorter than the predetermined time and then the electrical device is disconnected from the external power source, the battery management unit determines whether a residual power of the internal power source is decreased by a threshold value; when the battery management unit determines that the residual power of the internal power source is decreased by the threshold value, the battery management unit resets the timer; and when the battery management unit determines that the residual power of the internal power source is not decreased by the threshold value, the battery management unit does not reset the timer.