I'm curious as to the Voltage requirements of the UDOO. I noticed that the UDOO comes with a 5-15V power adapter, but was unsure what would be needed for regular use. I'll be using the WIFI, a Linux install and the Arduino half, but no screens or external hard drives, etc. I'm working on a project that will ultimately be battery powered so I was mostly curious as to what type of battery pack I should spec out. I didn't see the information anywhere but thought maybe I missed it. Thanks.