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The Gooloo GP4000 is a portable lithium jump starter rated at 2000 peak amps and 2000 W, built to start gasoline engines up to about 8.0 L and diesels up to about 6.5 L. It weighs 4.19 lb and measures 3.92 inches wide, so it fits in a glovebox or under a seat. It also works as a power bank and flashlight. The best new price is $79.99 at eBay as of November 7, 2026, with 2 stores listing it new.
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Lowest price we've seen: $119.99 on Nov 8 at Newegg. Tracked across 1 store since Nov 8.
Owners generally rate the GP4000 well for starting cars and trucks that sat too long, and for its small size in the trunk. Complaints center on the plastic clamps and on the battery losing charge if it is left unused for months.
