The present invention discloses an energy management method for a device including a rechargeable-battery. The energy management method includes: obtaining, by the device including a rechargeable-battery, information that is related to energy availability; analyzing, by the device including a rechargeable-battery according to the information that is related to energy availability, the energy availability of the device including a rechargeable-battery, and determining, according to an analysis result, an energy availability level of the device including a rechargeable-battery; generating, by the device including a rechargeable-battery, an energy management policy according to the energy availability level; and executing, by the device including a rechargeable-battery, the energy management policy. The present invention further discloses a device including a rechargeable-battery. In the foregoing manners, the present invention can effectively improve a battery endurance capability and improve user experience.