I want to make a cheap and nifty laptop (sort of) using Raspberry Pi. I've managed to scavenge a small monitor, a mouse and a keyboard. I wanted to know if there is some way of using a battery pack of some kind to power the machine so I can use it as a laptop. Is the power supply small, if so can I use normal batteries? And if not, what else can I do? Solar power? Anyway, thanks.