Abstract: A portable power supply is provided with a power-on light; an LED member; an LED switch electrically connected to the LED member for turning on or off the LED member; a first power socket; a USB port; a second power socket; a display for showing a voltage reading; an internal battery assembly having a plurality of rechargeable batteries; and an internal control circuit board electrically interconnecting the battery assembly and each of the power-on light, the LED switch, the first power socket, the USB port, the second power socket, and the display.