Power tool capable of charging a rechargeable battery unit that includes at least a standard-sized battery cell

摘要

A power tool includes a tool housing, a motor device, and a power module. The tool housing accommodates removably a rechargeable battery unit. The motor device is mounted in the tool housing. The power module is coupled to the motor device for supplying electric power thereto, is responsive to an external power signal for permitting charging of the rechargeable battery unit simultaneous with supply of the electric power to the motor device when the rechargeable battery unit is disposed in the tool housing, and permits supply of the electric power to the motor device through the rechargeable battery unit in the absence of the external power signal.