Abstract: A power tool battery pack that includes a housing, a plurality of battery cells supported within the housing, a tool terminal disposed on the housing and electrically connected to the plurality of battery cells, a voltage output port electrically connected to the plurality of battery cells, a voltage converter configured to receive power from the plurality of battery cells to output power port, and an electronic controller. The controller is operable to determine whether the voltage output is electrically connected to an external load, determine a load voltage associated with the external load, determine whether a voltage of the plurality of battery cells is greater than or equal to load voltage, and transfer power from the plurality of battery cells when the voltage of the plurality of battery cells is greater than or equal to the load voltage.