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The GB40 is a portable lithium-ion battery jump starter pack that delivers 1,000-amps (7,000 J3S) for jump starting a dead battery in seconds. It features a patented safety technology that provides spark-proof connections and reverse polarity protection making safe and easy for anyone to use. It's a powerful battery booster that doubles as a portable power source for recharging USB devices, like a smartphone, tablet and more. And designed for a car, boat, RV, truck and more with gas engines up to 6 liters, and diesel engines up to 3 liters.