NOCO Boost Plus GB40

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.

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.

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.

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.

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.

The Amazon listing for NOCO Boost Plus GB40 carries a California Prop 65 warning. California requires this warning on a very wide range of manufactured goods — including electronics with wiring, solder joints, or plastic/metal housings — whenever trace exposure to any of roughly 900 listed substances (commonly phthalates or heavy metals) is possible, regardless of whether the specific product poses a meaningful health risk. As a passive electronics product, NOCO Boost Plus GB40 has no Safety Data Sheet, so there's no chemistry breakdown to translate beyond that.