It took me an hour to get a hold of the right mechanics, but one of those jump-started my bus with one of those small lithium jump-starters. I was amazed something so small brought something so large to life.
My Lieutenant still tried to get me in trouble for that I am pretty sure I did not understand why at the time.
I have also been intrigued by the ones that plug into your 12v port, but that is another thing I need to fix on my Civic...