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Keep in mind when considering one that the battery's ability to start a car is dependent upon many factors, including the size of the engine, the state of the vehicle's battery, whether the car's starter is a more recent and therefore more efficient model - and, lastly, the amperage of the jumper battery itself.Ī mperage rating: The amperage rating ranges between 150 to 450 cold-cranking amps (CCA), though that number isn't always available in the product's specifications. With that in mind, we sought out the best portable jump-starters, listed below. Even if it's not your car that goes terminals-up at a freeway rest stop, it's always worth carrying a portable jump starter so you can be the Good Samaritan someday. Though dead batteries feel like increasingly rare occurrences with modern cars, they do still happen.

They can even be used in a pinch to charge your mobile electronics. They're now sleek, computer-regulated lithium-ion gadgets that can fit discreetly in your trunk (or even your glove box, in some cases). The best portable jump starters you can buy are years beyond those past heavy contraptions that looked suspiciously like, well, car batteries.