Ok, so tomarrow I'm going on a trip with my friend to a retreat. We are taking a bus ride up there and it is like 4 hours long. I pretty sure there will be nothing to do, so I'm thinking about bring my PSP. Now, my PSP can only hold a charge for about 4 hours, which is only have the trip. So I was wondering if there would be any easy mobile way to charge my PSP. I can't run out to the store, so I'll have to work with what I have.