In-depth review
NOCO Boost Plus GB40 Review (2027)
In-depth research review of the NOCO Boost Plus GB40: 1000-amp performance, safety, cold rating, and who should buy it.
Our verdict
The NOCO Boost Plus GB40 remains the default jump starter recommendation in 2027. Its 1000 peak amps cover gas engines to 6.0L and diesels to 3.0L, spark-proof and reverse-polarity protection remove the classic user errors, and the minus 22 F rating means it works on the worst mornings. The trade-offs are the 3.0L diesel ceiling and a premium price versus generic packs. For most drivers, this is the one to buy.
What we like
- 1000 peak amps start gas engines up to 6.0L and diesels up to 3.0L
- Spark-proof connections and reverse-polarity protection
- Doubles as a USB power bank for phones
- Rated to operate down to minus 22 degrees Fahrenheit
What to watch out for
- Not enough for big diesel trucks
- Single USB output is slow by modern fast-charge standards
- Premium price versus generic 1000-amp units
What owners report: NOCO Boost Plus GB40
Synthesized from recurring themes in long-term owner feedback.
Most praised
- Spark proof, mistake proof hookup is the feature nervous first time users mention most
- Cold weather capability means the trunk stored pack still works on the worst winter morning
- Right sized for most family cars, neither glovebox tiny nor shop heavy
Common complaints
- Large diesel trucks sit beyond what this mid sized pack can turn over
- Phone charging through its single port feels slow next to modern fast charge packs
- It costs more than generic packs with similar headline figures on paper
Who it is for
Commuters and families with gas cars and small SUVs who want a proven, safe, winter-capable jump starter in the glove box or trunk.
Power and engine coverage
1000 peak amps is the sweet spot for passenger vehicles: enough to crank 6.0L gas engines and 3.0L diesels, which covers the overwhelming majority of cars on the road. NOCO's ratings are conservative compared to generic brands, so the GB40 tends to perform at or above expectations rather than below them.
Safety system
The spark-proof technology and reverse-polarity protection are the GB40's real differentiators. Connect the clamps backwards and the unit simply will not engage, instead of showering sparks. For drivers who have never jumped a car, this removes the two mistakes that cause injuries and fried electronics.
Cold weather and extras
The minus 22 F operating rating is unusually specific and unusually good; most generic packs list no low-temperature rating at all. The USB output charges phones in an emergency, and the 100-lumen LED works as a trouble light. Recharge the pack every 6 to 12 months and it stays ready.
Key specifications
- Peak current
- 1000 amps
- Gas engines
- Up to 6.0L
- Diesel engines
- Up to 3.0L
- Safety
- Spark-proof, reverse-polarity protection
- Low-temp rating
- Minus 22 F
Also consider
NOCO Boost HD GB70
2000 amps for trucks and diesels.
Why consider it: Double the amps and diesel coverage for trucks and large SUVs.
- Peak current: 2000 amps
- Gas engines: Up to 8.0L
Clore Automotive Jump-N-Carry JNC660
The shop-grade lead-acid workhorse.
Why consider it: Shop-grade sustained cranking if you want lead-acid stamina.
- Peak current: 1700 amps
- Battery: 12V 22Ah sealed lead-acid
Research-based assessment. TrueGear has not hands-on tested this product; this evaluation synthesizes manufacturer specifications, retailer documentation, and published expert reviews.
Questions, answered
Will the GB40 start my V8 truck?
Gas V8s up to 6.0L, yes. Larger engines and diesels above 3.0L need the GB70's 2000 amps.
How do I know it is charged?
LED charge indicators show the level. Top it up every 6 to 12 months; lithium holds charge well in storage.
Can it charge my phone?
Yes, the USB output works as a power bank, though it is not a fast charger by 2027 standards.