A power tool that is powered by a battery pack includes a function member, a motor, a motor driving circuitry, an energy storage component, an electromagnetic switch, and a power-off protection module. The electromagnetic switch includes a coil, a first switch electrically connected to the coil and configured to turn on and off an electrical connection between the coil and the battery pack, and a second switch electrically connected to the motor driving circuitry and configured to turn on and off an electrical connection between the battery pack and the motor driving circuitry. The power-off protection module is electrically connected to the coil and to the energy storage component and is configured to cut off an electrical connection between the coil and the energy storage in response to the power tool and the battery pack being electrically disconnected.