[Blind-sysadmins] Looking for a tiny battery operated PC.

I'm working on a really tiny battery operated project at the moment. Anyone know of a PC that is about the size of a raspberry pi that can run for about eight hours on a battery? It doesn't need to have network or video out. It needs two USB and 1 audio out. I could build one using a Raspberry pi but I'd need someone with a 3D printer to get the case right. I don't particularly mind if it runs Windows or Linux but if it's Linux, enough power to run Gnome and Orca would be great.