Abstract: A power management system of a server includes a power supply unit, and a power backup unit connecting to an input terminal and an output terminal of the power supply unit. The power backup unit further includes a charging unit, a power storage unit, and a converting unit. The charging unit uses an output power from the output terminal to charge the power storage unit when an external power source is supplying power to the power supply unit. The converting unit converts a stored power of the power storage unit to provide a backup power to the input terminal when the external power source is shutdown. The disclosure further provides a power management method.

Abstract: A power control system includes a power control unit, a processing unit, and a power storage unit. The power storage unit supplies power to an electronic device when the electronic device experiences a sudden power failure from an external power source. The power control unit obtains a discharge voltage, a discharge current value and a discharge temperature of the power storage unit. The processing unit determines whether a protection voltage of the power storage unit should be changed or not according to the discharge temperature and the discharge current value. The power control system controls operation of the power storage unit according to a comparison between the discharge voltage and the protection voltage. The disclosure further provides a power control method.

Abstract: A method for managing electric quantity of a battery is disclosed. The method includes charging a battery normally with a 4.2V voltage when a temperature of the battery is lower than a first threshold temperature; charging the battery continuously when the temperature of the battery is higher than the first threshold temperature and lower than a second threshold temperature and the electric quantity of the battery is lower than a first threshold voltage. On the contrary, the battery is not charged any more when the temperature of the battery is between the first threshold temperature and the second threshold temperature and the electric quantity of the battery is higher than the first threshold voltage or a first capacity. If the temperature of the battery is higher than a second threshold temperature, the battery is not charged any more regardless of the battery voltage.

Abstract: A method for managing electric quantity of a battery is disclosed. The method includes charging a battery normally with a 4.2V voltage when a temperature of the battery is lower than a first threshold temperature; charging the battery continuously when the temperature of the battery is higher than the first threshold temperature and lower than a second threshold temperature and the electric quantity of the battery is lower than a first threshold voltage. On the contrary, the battery is not charged any more when the temperature of the battery is between the first threshold temperature and the second threshold temperature and the electric quantity of the battery is higher than the first threshold voltage or a first capacity. If the temperature of the battery is higher than a second threshold temperature, the battery is not charged any more regardless of the battery voltage.