Anker is well-known for their external battery packs in varying sizes that carry a wide range of different power levels. Whether you need something with just a little extra juice or a behemoth battery pack to last you days, Anker surely has something for just about anyone. Right now they have a deal on Amazon for a 10,000mAh battery pack which doubles as a compact car jump starter and it's on sale down from $159.99 to $79.99. It will allow you to jump start your 3L gas or 2.5L diesel vehicle, and it comes with two USB charging ports for two devices at once, if need be. It's also equipped with an emergency flashlight so you can see what you're doing in the dark should you need to jump a car at night, or just simply find your keys.