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the PowerRunner is your best friend when it comes to powering the jb3. It has numerous voltage settings on it. Works WONDERFULLY with the jb3. I also use it to power my d8 when I feel like running DAT.
I got a couple of these from Woot (two for tuesday for something like $14 for 2) and love them. You just plug your wall wart into them and they power my JB3 just fine. It has both a normal 110v power plug and a USB out regulated to 5v. When I get a chance I am going to hack a USB cable and use it to power my JB3, since 5v is what the JB3 looks for.http://www.amazon.com/Black-Decker-CP120B-20-Watt-Battery/dp/B000H78YXQ