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Lego Nxt working with no batteries

Step 5The Moment of Truth

Take the 5v to 9v usb converter (http://www.seeingwithsound.com/usb_powersupply.htm) and plug it into your computer's usb port. Take the usb wire and plug one end into the converter and the other end into the NXT brick. With no batteries in it hit the start up button. Congrads!!!! You have a NXT brick that runs on batteries and usb power. If it did not work start trouble shooting. Open it up again and make sure the solders are good and tight. If that seems all good and well make sure the diode is correctly pointed towards the battery terminal.