This NOCO Boost Plus GB40 review covers what the compact jump starter does well, what it does not, and who it is built for, based on published specs and a broad read of verified owner feedback. As an Amazon Associate we earn from qualifying purchases.
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NOCO Boost Plus GB40 Jump Starter Editor's Choice 1000A peak, up to 6L gas or 3L diesel, USB power bank |
9.2 | 🛒 Check Price |
1. NOCO Boost Plus GB40 Jump Starter: Editor's Choice
The NOCO Boost Plus GB40 is the jump starter most people should look at first. It packs a 1000-amp peak output into a unit small enough to live in your glovebox, and it doubles as a USB power bank and an LED work light.
Real-world performance
Owner feedback is consistently strong on cold starts. For four and six cylinder engines, and many V8s up to about 6 liters of gas or 3 liters of diesel, it fires the engine on the first or second try in most reports. The clamps are spark proof and reverse polarity protected, which makes it forgiving for first time users.
Specs and build
At roughly the size of a paperback, it is genuinely pocketable. The rugged case shrugs off knocks, the battery holds charge for months between uses, and the USB port keeps a phone topped up on the road.
Who it suits
Daily drivers, small to mid size cars, and anyone who wants a compact safety net in the trunk. It also makes a strong gift for new drivers because the safety features are hard to misuse.
Who should size up
If you run a large diesel truck or a fleet, a higher capacity model with more peak amps and faster recharging will serve you better.
- 1000A peak for up to 6L gas and 3L diesel engines
- Doubles as a USB power bank and LED work light
- Spark-proof, reverse-polarity safe clamps
- Compact enough to live in the glovebox
Pros: Reliable starts, including in cold weather; Genuinely pocketable and light; Safe clamps that are forgiving for first-timers; USB output and work light add real value
Cons: Smaller capacity than truck-focused units; Recharging from empty takes a while; Not the pick for large diesel engines
Frequently Asked Questions
Will the NOCO GB40 start a V8?
Yes. The GB40 is rated for many V8 gas engines up to about 6 liters, and most owners report dependable starts on standard cars and light trucks.
Can the GB40 charge a phone?
Yes. It has a USB output that works as a power bank, plus a built-in LED light with several modes.
How long does the GB40 hold a charge?
NOCO rates it to hold useful charge for up to a year, though topping it up every few months keeps it ready for an emergency.
Our Verdict
The NOCO Boost Plus GB40 earns its popularity. For everyday cars and small trucks it is compact, safe and dependable, and the USB bank and work light make it useful beyond jump starts. Drivers with large diesels should size up, but for most people this is an easy recommendation. For more options, see our portable jump starter guide.
Last reviewed and spec-checked: August 28, 2025. We re-check our picks and listings periodically.
