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Compact, portable Jumpstarters are among the most civilized automotive inventions of the past decade or so—spurred by the rise of the lithium-ion battery over a previous generation of lead-acid devices. Suddenly, leaving your headlights on no longer means waiting two hours for a tow truck driver or begging strangers to hook up cables. Just pull out one of these little boxes, and go along your way.

This tiny 3000-amp A3 Gooloo jumpstarter, small enough to fit in a glove box, is the lowest-cost jumpstarter whose reliability I can personally vouch for. I've carried mine in multiple cars over the p

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