NOCO Boost Plus GB40 Review: The Jump Starter That Fits in Your Glove Box
Why we noticed it
The GB40 holds the #1 spot in Amazon's Jump Starters category and has been there for years, with buyer feedback consistently landing on the same theme: people who were stranded used it, and it worked. Mechanics and roadside pros recommend it. When a car product sustains this level of real-world trust over this many years, it earns a review.
What it does
It's a lithium battery pack with heavy-duty booster clamps attached. Fully charged, it delivers up to 20 jump starts on a single charge (per NOCO's rating). The headline is the UltraSafe protection: spark-proof connections, reverse-polarity protection, anti-surge, overcharge and over-discharge safeguards — in plain terms, it's hard to hurt yourself or the car even if you clamp it on wrong. It also doubles as a USB power bank for phones and tablets, and includes a 100-lumen LED flashlight with seven modes (including SOS and strobe) for nighttime breakdowns.
What we like
- It genuinely starts dead cars — 1000 peak amps handles most sedans, SUVs, trucks, boats, and motorcycles; the vast majority of what sits in a home garage.
- Mistake-proof by design — reverse the clamps and nothing happens; no sparks, no drama, no fried electronics; this is the feature that makes it safe to hand to a nervous teenager.
- Glove-box size — roughly the footprint of a paperback and under two pounds; no more bulky jumper cables tangling in the trunk, and no need to flag down a stranger.
- Doubles as a power bank — the USB output charges phones, tablets, and small devices; useful on a road trip even when the battery is fine.
- 20 jumps per charge — charge it every few months (it holds charge well in storage) and it's ready; the LED indicators tell you charge status at a glance.
The catch
- Not for big diesels — up to 3.0L diesel and 6.0L gas covers most consumer vehicles, but heavy-duty trucks with big diesel engines need a bigger NOCO model (GB70 and up).
- You have to remember to charge it — lithium packs self-discharge slowly; a jump starter dead in the glove box is just a paperweight; set a reminder every 3–6 months.
- It's not cheap for something you rarely use — ~$100 is real money for a “hope I never need it” tool, though one tow or roadside call costs as much or more.
- Clamps are small — they grip most battery terminals fine, but cramped engine bays with recessed terminals can be fiddly.
Who it's for
Anyone who drives — commuters, parents handing keys to new drivers, road-trippers, boat and motorcycle owners; it's an especially good gift for someone you worry about on the road. Skip it if you drive a heavy-duty diesel truck (step up to the GB70/GB150), you already have a jump starter you're happy with, or your car has a start-stop AGM battery setup you never let sit long enough to die (though a dead battery can still happen).
Price and where to buy
How we evaluated it
We did not hands-on test the GB40. This review is researched and curated: we compared NOCO's published specs (peak amps, engine-size ratings, jump-starts-per-charge) against competing jump starters in the 1000-amp class, read through buyer reviews focusing on real roadside-use reports and failure cases, and checked its long-running bestseller standing. Findings reflect aggregated buyer experience and published specifications, not a lab test.
3 alternatives
FAQ
Will it start my car?
For most gas cars, SUVs, and light trucks — yes; check the ratings: gas engines up to 6.0L, diesels up to 3.0L.
Is it safe if I connect the clamps wrong?
Yes — the UltraSafe system is spark-proof with reverse-polarity protection, so incorrect connections won't damage the unit or the vehicle.
How often do I need to charge it?
NOCO recommends recharging every 6 months at minimum; we suggest every 3 months so it's always ready; it holds charge well between top-ups.
Final verdict
The GB40 is the rare emergency tool that earns its shelf space: proven by years of bestseller status and real stranded-driver stories, genuinely mistake-proof, and cheap insurance against the most common car problem there is. Put one in every car you own. Verdict: Worth it.
Category: Auto · Tags: Under $50, Gifts, Problem Solvers, Travel
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