This is a new trend we've started seeing as of late. It's a power bank to keep your smartphone charged up, but also a battery that can jump start your car. I actually have one that I leave in my car and it works flawlessly. It's able to jump-start my car with ease as well as charging up my smartphone or tablet. This is a 12,000mAh battery pack here and it has two USB ports. One is a 1A port and the other is a 2A port. Right now this is one sale on Amazon for just $75, but it likely won't last long, so you'll want to grab it before it's gone.