Personal+AC0-Sized Battery Jump Boxes

From the day of the first dead car battery 100 years ago, resuscitating a flat battery requires a set of jumper cables, a secondary power source (like another car), and sufficient room to place the cars close enough to connect the cables. Even then, the effort was not always successful. Often, cables were either too short or featured such tiny cables that amperage just didn’t flow, and the inert battery remained flat. Worse yet was the feeling of helplessness when you’re standing there with jumper cables in your hand and no one offers to help.

All of that should now be placed firmly in the past. With the development of powerful lithium-ion batteries, a sharp engineer came up with the idea to build a portable battery pack that could fit in your hand with enough power to crank a near-dead battery even when hooked to a large V-8 engine. When these units first appeared, we were skeptical, but performance has actually proven