It's very easy for other PSP users to upload onto a store's PSP. I watched my friend do something of the same nature a couple of days ago, but it was a floor model, probably never to be sold.
Sure.... your Friend... Lies all lies saris!
Battery is the bad part lol... but me and my friend usually hook his ipod to nice little outlet right beside us in french class and enjoy 1 1/2 hours of Futurama and such everyday... lol