<；P>；PROBLEM TO BE SOLVED: To provide a battery-driven implement enabling a feed current to a DC motor to be switched by the operation of a starting switch even when the short-circuited obstacle of a semiconductor switching element is caused, and having functions for detecting the short-circuited obstacle of the semiconductor switching element, and to provide a method for controlling the implement. <；P>；SOLUTION: The implement equipped with a battery 10, a rotation part 7 for rotating a blade or the like, a motor 20 for driving the rotation part 7, and a control circuit for controlling the motor 20 is constituted as follows. The control circuit has a main circuit obtained by connecting the battery 10 with the motor 20, and a control unit 50 having a starting switch 51, installed therein, and the main circuit has a relay contact point 40 controlled by the control unit 50, and the semiconductor switching element (FET30) formed in series. <；P>；COPYRIGHT: (C)2011,JPO&INPIT
