At Moonshine Thepaleobiker showed me a Jump Starter. It was small, would fit in your hand and he said it could start 4 cars. I went to Amazon and found many. I purchased the Energen. There are many choices for you comparison shoppers. On a recent trip the dreaded key left on gremlin struck. The bike would slowly crank but not fire. Hooked up the jump starter and the bike immediately fired up. The unit takes up very little space, has an LED flashlight and can charge all of our portable devices. Has anyone needed a jump and there was no one around? This is your answer.