For about as long as cars have had batteries in them, jumper cables have gone hand ... a portable jump starter. A portable jump starter is a similar device to a car battery charger, except instead ...

An ultra-compact charger, on the other hand ... choosing a portable charger is that you want to know where it comes from, so you don’t fry your phone. You can find tons of battery packs from ...

which is a portable device that delivers a burst of power to a dead car battery. This allows the engine to start immediately, working much faster than a 12V charger. But while that's impressive ...