Priced as of May 14, 2026
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Prices may varyCarCareTruth's Analysis
Last reviewed May 15, 2026
TL;DR No confirmed UL or ETL listing — the Amazon spec table claims UL, but UL Product iQ lookup was inconclusive as of scoring. Claims 1,000A peak; community confirms reliable starting for gas engines up to 6 cylinders under normal conditions; cold-weather performance below 20°F is mixed in owner reports. Standard Li-ion; plan for a top-off charge every 4–6 months.
What it is and how it performs
The GB40 claims 1,000A peak for 12V lead-acid batteries in vehicles up to 6.0L gas and 3.0L diesel — that rating has not been independently bench-verified. Community evidence confirms reliable starting of 4–6 cylinder gas engines under normal conditions; TechGearLab completed three consecutive starts on a 4.0L V6. Below 20°F, results diverge: GarageJournal forum owners documented failures on a 4.7L V8 at 10°F and on smaller engines at near-zero temperatures, sometimes requiring the unit to be warmed against the body before it would crank. Charge retention is adequate — TechGearLab measured 65% of the labeled capacity delivered; long-term owners report several months of glovebox storage before a top-off is needed. The IP65-rated housing, rubberized overmolding, and independently praised clamps are genuine build strengths. The cable measures 23 inches — shorter than the 3–4 foot category median, which limits reach in some engine bay configurations.
Who should buy this — and who should skip it
Good fit for drivers of 4–6 cylinder gas vehicles who want a compact, IP65-rated unit and are willing to top off the charge twice a year. Skip it for large diesel engines beyond 3.0L, V8 gas trucks, or environments where temperatures regularly drop below 20°F — the 1,000A peak is not independently verified for high-compression or cold-degraded scenarios, and a unit rated ≥ 2,000A with cold-weather community confirmation is worth the cost step-up. Also skip it if a confirmed UL certification is a requirement — the Amazon listing claims UL, but that claim was not confirmed via UL Product iQ at time of scoring.
Safety and environmental impact
The GB40 is a battery-powered electronic device — no SDS exists and there is no chemical exposure risk during normal use. The Amazon spec table states "Specification Met: UL" but this was not confirmed via UL Product iQ as of 2026-05-13; the health score reflects the unconfirmed certification status. NOCO's UltraSafe spark-proof and reverse-polarity protection is community-confirmed functional. No active CPSC recall exists as of 2026-05-13 (cpsc.gov). NOCO lists a Proposition 65 warning in the user guide — lead and exhaust fumes from battery connections, not from the device itself. For disposal, the standard Li-ion battery pack is accepted through Call2Recycle drop-off locations (Home Depot, Lowe's, Staples, Best Buy); no NOCO manufacturer take-back program is documented for this unit.
Frequently asked questions
Is the NOCO Boost Plus GB40 UL-listed?▾
The Amazon product listing states 'Specification Met: UL' in the specifications table. However, a search of the UL Product iQ database (productiq.ul.com) as of May 2026 did not confirm a UL 2743 listing for the GB40 model specifically. The product user guide mentions only FCC Part 15 compliance. If UL listing is a hard requirement, verify directly at productiq.ul.com before purchasing — the answer to this question may change if a listing is subsequently added.
Will the GB40 start a diesel engine?▾
NOCO rates the GB40 for diesel engines up to 3.0L. Community evidence for diesel starting is limited — the bulk of verified owner reports involve gas engines up to 6 cylinders. Cold diesel engines (below 20°F) will be harder to start than warm ones, and lithium battery output drops in cold temperatures. For larger diesel engines (4.0L+) or cold-climate diesel applications, a unit rated ≥ 2,000A is a safer choice.
How long does the GB40 hold its charge in storage?▾
Community reports generally confirm the GB40 holds a usable charge for several months when stored in a vehicle glovebox or garage. TechGearLab measured 65% of the rated capacity delivered under test conditions. The recommendation from both the manufacturer and long-term owners is to top off the charge every 4–6 months. LFP-chemistry jump starters retain charge significantly longer; the GB40 uses standard Li-ion.
Does the GB40 work in cold weather?▾
Community evidence is mixed. TechGearLab completed three consecutive starts on a 4.0L V6 in cold conditions. Owners on GarageJournal documented failures at 10°F on a 4.7L V8 and at 0–5°F on smaller engines (requiring the unit to be warmed against the body first). At −15°F, one Vermont owner reported the unit was non-functional. As a lithium device, capacity degrades below 20°F. For cold-climate reliability below 20°F, consider units with LFP chemistry or a higher peak-amp rating.
Is there an active CPSC recall on the NOCO GB40?▾
No active CPSC recall was found for the NOCO Boost Plus GB40 as of May 2026. The CPSC recall database at cpsc.gov/recalls is the authoritative source — check it directly if purchasing an older or resold unit.
From the manufacturer
Marketing copy from NOCO, via Amazon. Not editorial.
- •START DEAD BATTERIES — Instantly start dead batteries with 1000 amps of peak lithium power. Up to 20 starts per charge on engines up to 6.0L gas and 3.0L diesel.
- •ULTRASAFE TECHNOLOGY — Engineered with patented spark-proof and reverse polarity protection for foolproof connections to any 12V vehicle - no sparks, no wrong connections.
- •PORTABLE POWER BANK — Integrated power bank delivers emergency power to smartphones, tablets, and more. Recharges in 3 hours so it’s ready when it matters most.
- •INTEGRATED LED FLASHLIGHT — Precision-engineered 100-lumen LED with 7 light modes, including SOS and strobe. Illuminate repairs, emergencies, or low-light environments.
- •COMPACT YET POWERFUL — High-discharge lithium technology delivers exceptional starting performance in a compact 2.5 lb form factor - perfectly sized for glove boxes and emergency kits.
- •BUILT TOUGH — Rugged IP65-rated housing with rubberized over-molding protects against water, dust, and impact. Includes high-conductivity clamps for maximum energy transfer.
- •WHAT’S IN THE BOX — GB40 jump starter, heavy-duty clamps, USB-C charging cable, and microfiber storage bag. Backed by a 1-year warranty and engineered in the USA.
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Manufacturer videos
Manufacturer images
Manufacturer specifications
- Brand
- NOCO
- Battery Cell Composition
- Lithium
- Voltage
- 12 Volts
- Product Dimensions
- 4.61"D x 8.19"W x 4.21"H
- Vehicle Service Type
- ATV, Motorcycle, Passenger Car, RV, Tractor, Truck, UTV, Van, Watercraft
- Battery Type
- Lithium
- Compatible with Vehicle Type
- ATV, Motorcycle, Passenger Car, RV, Tractor, Truck, UTV, Van, Watercraft
- Battery Capacity
- 2150 Milliamp Hours
- Amperage
- 1000 Amps
- Peak Output Current
- 1000 Amps
- Automotive Fit Type
- Universal Fit
- Item Dimensions D x W x H
- 4.61"D x 8.19"W x 4.21"H
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Top Amazon review
↗External — Amazon's most-helpful review for context.
Good quality and worked fast
OK, I bought this in July 2024. It’s March 2026 and I used it for the first time. There was at least a six month period where I did not charge it and I was a little concerned whether it was going to hold the charge. I charged it two months ago, it still has full charge, it was super simple to use and quick to jump a vehicle with a dead battery. The only thing is the instruction booklet has tiny writing so read it ahead of time and maybe write yourself down some instructions and laminate them so the paper lasts in the car :-)Two people in the parking lot took pictures of this so they could get it for their cars. Highly recommended.