NOCO Boost GB40 · 1000A UltraSafe Lithium Jump Starter
The pocket-sized power pack every driver should keep in the trunk
Check Price on Amazon →A dead battery has a way of striking at the worst possible moment — a freezing morning, an empty parking lot, miles from anywhere. The NOCO Boost GB40 exists to make that moment a non-event. This compact 1000-amp lithium jump starter lets you revive a dead car battery in seconds without flagging down a stranger or waiting on roadside assistance. After reviewing its real-world performance, safety features, and the thousands of verified owner reviews, here's our complete verdict.
The headline number is 1000 amps of peak current, and in practice that's more than enough for the vast majority of vehicles on the road. The GB40 is rated to jump start gas engines up to 6.0 liters and diesel engines up to 3.0 liters — which covers virtually every sedan, SUV, motorcycle, ATV, boat, and most light trucks. Owners consistently report their dead car firing up within seconds of connecting the clamps.
What's genuinely impressive is the longevity per charge: a single full charge holds enough power for up to 20 jump starts, so you can keep it in your trunk for months and still trust it in an emergency. It also performs reliably in cold weather, rated to operate down to -4°F (-20°C) — exactly when dead batteries are most common.
NOCO's "UltraSafe" branding isn't just marketing. The GB40 includes spark-proof technology and reverse-polarity protection, meaning you can connect the clamps without the anxiety of sparks, shorts, or accidentally damaging your vehicle's electronics. For anyone who has nervously connected traditional jumper cables to another car, this peace of mind is the GB40's single best feature. Mismatched connections simply won't activate the unit — it tells you to fix the connection instead of arcing.
The GB40 pulls triple duty:
This versatility is why so many owners describe it as an essential piece of emergency gear rather than a single-use gadget.
You don't need to be mechanically inclined to use the GB40. Connect the heavy-duty clamps to your battery terminals (red to positive, black to negative), and the unit's LED indicators guide you. If everything is connected correctly, you start your engine — that's it. The included clamps and cables store neatly, and the whole kit is small enough to fit in a glovebox.
Perfect for: Everyday drivers, commuters, parents, road-trippers, and anyone who wants the security of never being stranded by a dead battery. It's ideal for cars, SUVs, motorcycles, boats, lawn equipment, and most light trucks. It also makes an excellent, practical gift.
Look at a bigger model if: You drive a large diesel truck (over 3.0L) or need to jump heavy equipment — step up to the NOCO GB50, GB70, or GB150 for higher amperage.
The NOCO Boost GB40 is one of the easiest "just buy it" recommendations in automotive accessories. It delivers genuine 1000-amp jump-starting power in a package that fits in your glovebox, with safety features that make it foolproof for beginners, plus bonus power-bank and flashlight functions. For the overwhelming majority of drivers, this is the portable jump starter to own — and you'll be grateful you have it the day your battery dies.
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