Power Tool External Power Supply Assembly

A power tool external power supply assembly for reducing weight and increasing run time of a power tool includes a backpack positionable upon a user. A battery, which is rechargeable, is positioned in the backpack. A power cord is operationally engaged to and extends from the battery through a hole in the backpack. A connector engaged to the power cord distal from the battery can be engaged to a direct current powered device, such as a power tool, so that the battery is operationally engaged thereto. The battery can power the direct current powered device without the user having to support a mass of the battery in a hand along with the direct current powered device.