The NOCO Boost GB40 delivers reliable 1000-amp peak jumping power in a compact 2.5-pound package with built-in safety features, though it requires routine recharge maintenance to ensure trunk readiness.
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| Power | 1000 amps peak; rated for up to 20 jump starts per charge on 12V engines up to about 6.0L gas or 3.0L diesel |
|---|---|
| Safety | Spark-proof design and reverse-polarity protection, so a wrong or loose connection won't spark |
| Extras | Doubles as a USB power bank for phones and tablets, and has a 100-lumen LED flashlight with 7 modes including SOS and strobe |
| Size and build | About 2.5 lb and glovebox-sized; IP65-rated housing with rubberized overmolding |
| Charging | Recharges in roughly 3 hours over USB-C |
| In the box | Jump starter, heavy-duty clamps, USB-C cable and a storage bag; backed by a 1-year warranty |
| Amazon Rating | 4.6 stars, 129,000+ ratings, about 82% 5-star |
At roughly 2.5 lb, the NOCO Boost GB40 is sized to fit easily inside a glovebox or center console. The housing features an IP65 rating with rubberized overmolding to protect against basic bumps and moisture. In the box, it comes with heavy-duty clamps, a USB-C charging cable, and a storage bag. While owners appreciate the rugged exterior, several reviewers note that the clamp leads are relatively short, which can limit maneuverability when connecting to widely spaced battery terminals.
Safety is a primary design focus for the GB40, which includes a spark-proof construction and reverse-polarity protection so incorrect connections will not spark or damage electronics. However, emergency readiness requires active maintenance. Verified buyers report that the unit self-discharges over several months when left untouched in a vehicle, a process compounded by cabin temperature swings. Additionally, because there is no physical switch lockout, the LED flashlight can be bumped on inside a bag and quietly drain the battery. Owners strongly recommend checking and topping off the charge periodically rather than treating it as a set-and-forget emergency device.
When kept charged, real-world performance is widely praised across thousands of owner reviews. Rated at 1000 peak amps for up to 20 jump starts per charge, it handles 12V engines up to 6.0L gas or 3.0L diesel, with users describing quick turn-overs in under a minute. Reviewers also report successful jumps even when the internal charge level drops to a single bar. Beyond jump starting, the unit doubles as a power bank for recharging mobile devices over USB and features a 100-lumen LED light with 7 modes including SOS and strobe. NOCO backs the unit with a 1-year warranty.
Patterns pulled from verified owner reviews, not our own usage log.
David Kim
Last updated: September 1, 2026
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8.4REVIEW · October 16, 2026
A lightweight, budget-friendly tool that breaks down for easy storage and handles several inches of snow with ease. The short reach is inadequate for large trucks, and the plastic joints can be a failure point under heavy pressure.
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8.7REVIEW · October 12, 2026
Generous 16-foot reach with thick, tangle-resistant vinyl insulation that stays flexible down to -40°F, backed by sturdy spring clamps. Copper-clad aluminum wire carries less current than pure copper, making it suboptimal for large diesel engines and heavy commercial trucks.
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8.6REVIEW · October 9, 2026
Effectively restores clarity to heavily oxidized lenses without the need for power tools, offering a significant safety upgrade for nighttime driving at a very low price point. The ceramic wipes dry out extremely fast once opened, and while the brand markets a lifetime guarantee, real-world longevity reports are mixed among owners.
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Written from in-depth product research
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Written from in-depth product research