Abstract: At least an embodiment of the invention enables data which can be effectively utilized in maintenance work to be acquired from a work-machine main body, in a portable electric work machine capable of having a battery pack attached thereto and detached therefrom. This portable electric work machine may be provided with: a battery pack provided with a battery and a memory; and a work-machine main body. The work-machine main body is provided with: a work unit for performing prescribed work; a work-machine controller; and a memory. When the battery pack is attached to the work-machine main body, information corresponding to information related to the purchase date or sale date and stored in memory is saved in memory.

Abstract: An embodiment may inhibit, in a simpler manner, the theft of a battery pack capable of being attached to and detached from a portable electric work machine. An electric brush cutter is provided with: a battery pack capable of assuming either a sleep state or an active state; and a work-machine main body. The battery pack is provided with a memory having, stored therein, information indicating the state of a battery. The brush cutting work-machine main body is provided with: a work unit and a work-machine controller for controlling the work unit. The work-machine controller prohibits operation of the work unit when the information stored in the memory of the battery pack indicates the sleep state, and enables operation of the work unit when the information stored in the memory of the battery pack indicates the active state.