It blows my mind how many CCA the small jumper packs have.anyone else see the video of the guy in china whos carrying a lithium battery, I think a bike battery and he gets in an elevator and it malfunctions and burns him alive. Not cool, its crazy how much energy can be stored in such a small space, and they are coming out with batteries it sounds like that are much more energy dense than current tech. Supposedly enough to make battery powered commercial flights more feasible.