Circuit for managing power provided by a battery in an electric device

The present disclosure relates to a power management circuit of an electronic device. The circuit may include a battery configured to provide a variable current to drive a load device, and a processing circuit electrically connected to the battery via a wire. The processing circuit may be configured to detect a voltage applied on the processing circuit, and power off the load device in response to a detection that the voltage applied on the processing circuit is smaller than a threshold value. The voltage applied on the processing circuit may depend on a cell voltage of the battery, and a voltage drop caused by the variable current and a resistance deriving from the battery and the wire. A change of the voltage applied on the processing circuit may lag behind a change of the variable current.