David Traver Adolphus / McClatchy “Boost” models are battery jump starters; and “Genius” models are charger/maintainers. The more you know. NOCO GeniusPro 25, 66% off. This and the big ...

A portable jump starter is a similar device to a car battery charger, except instead of carefully funneling electricity into the battery, it delivers one big jolt all at once to zap it back to life.