battery

Hey guys, finally got this all-in-one battery powered HM up and working. Thanks to Tom Cole for the design of the case, which I blatantly ripped-off for my own design. I know the printing of my case isn't great and the printer will need more adjustments. Everything fit, so it wasn't a big deal...

I am trying to determine an inexpensive manner in which to power a Stoker by battery. Harry Soo uses a Duracell Powerpack. They run over $100. I don't know electricity well. I have seen where some say you can't just plug a Stoker into a 12V outlet, yet isn't that what the Powerpack has...