Miniature Jump Starter

Thats crazy. I would never think something like that would give enough to jump a car let alone more than once. I have this at home because I have used the same at work for years and it will start 3 semi`s in a row in the dead of winter with batteries showing less than 3 volts.
Schumaker DSR115 4400 PA 12/24V JUMP STARTER | eBay