A dead battery on a winter morning usually means waiting for a second car and a set of cables. The GOOLOO GP4000 jump starter skips that wait. This take is research-based: GOOLOO's own specs and FAQ, plus published tests from Popular Mechanics, Project Farm and Car Battery Nerd, not hands-on testing. Popular Mechanics tested it in early 2025 and found enough power for a truck.
How it works
Plug the clamp cable into the pack, clip red to positive and black to negative, and wait for the light on the clamp to turn solid green. Then start the car. If the clamps are mixed up, the light turns red and it beeps instead of sparking, reassuring for a nervous first-timer.
Power and cold weather
It's rated at four thousand peak amps for twelve-volt gas and diesel engines up to ten liters, so cars, trucks and SUVs, even boats and tractors. GOOLOO says it works from minus four to one hundred forty degrees Fahrenheit. In Project Farm's 2020 head-to-head of six jump starters, the GP4000 delivered the most current of the group.
More than a jump starter
USB-C charges the pack or a phone, there are USB ports too, and a built-in LED flashlight has strobe and SOS modes for a roadside stop at night. It comes in a hard case, and GOOLOO says it can sit in standby for up to two years, though it recommends topping it up every three months.
The honest catch
Peak amps is mostly a marketing number, so real tests matter more. A few owners report a failed clamp cable, or a pack that couldn't revive a completely flat battery. Popular Mechanics noted it's a bit heavier than some rivals. It only works on twelve-volt batteries, and GOOLOO warns that heat above one hundred forty degrees can damage it, so don't leave it in a hot car all summer.
GP4000 or jumper cables?
GP4000 or jumper cables? Cables need a second car and someone willing to stop. NOCO's Boost packs are the best-known name in this category. The GP4000 makes sense if you want plenty of power for bigger engines plus a capable power bank in one case.
Our verdict
The GOOLOO GP4000 is worth keeping in the trunk for most drivers, especially with cold winters, a truck or SUV, or a new driver on your gift list. If you want the smallest, lightest pack, skip it.
