NOCO Boost Plus GB40
The GB40 is NOCO's 1,000 amp jump starter, rated for gas engines up to 6.0 liters and diesel engines up to 3.0 liters. It is listed to UL 2743 in the Intertek directory and carries the ETL mark, not a UL mark.
Checked against sources on by the TrueAmps editorial team.
- Peak current
- 1,000 A
- Internal battery
- 24 Wh
- Gas engines up to
- 6.0 L
- Diesel engines up to
- 3.0 L
- Weight
- 2.45 lb
- Safety listing
- UL 2743
Ratings are the manufacturer's own, from NOCO's spec page, checked September 24, 2026. Safety listing: ETL (Intertek), directory record, checked September 24, 2026.
See NOCO Boost Plus GB40 on Amazon (paid link)
Engine rating against the rest of the line
What the 1,000 A rating covers
The diesel number is the one to watch. If your diesel is larger than 3.0 liters, the next NOCO ratings up are the GBX45 (4.0 L) and the GB70 (6.0 L).
The mark printed on NOCO's own GB40 data sheet is ETL, from Intertek, not UL. The Intertek directory lists the GB40 as evaluated to UL 2743. So the standard is UL's and the laboratory is Intertek, and "ETL listed to UL 2743" is the accurate way to say it.
NOCO's data sheet quotes 20 jump starts per charge and a 3 hour recharge from a 2 amp USB source, 6 hours from 1 amp.
Next size down and up
| Model | Peak A | Wh | Gas L | Diesel L |
|---|---|---|---|---|
| NOCO Boost Plus GB40 | 1,000 | 24 | 6.0 | 3.0 |
| NOCO Boost Sport GB20 | 500 | 24 | 4.0 | - |
| NOCO Boost X GBX45 | 1,250 | 31 | 6.5 | 4.0 |
All jump starters side by side
Head to head: GB20 vs GB40, GB40 vs GBX45, GB40 vs GB70
Boost Plus GB40: questions people ask
Will a NOCO GB40 start a V8?
NOCO rates the GB40 for gas engines up to 6.0 liters. A gas V8 at or under 6.0 L is inside that rating; above it NOCO rates the GB70 (8.0 L).
How long does the GB40 take to recharge?
NOCO's data sheet lists 12 hours at 0.5 A, 6 hours at 1 A and 3 hours at 2 A over USB.
Is the GB40 UL or ETL listed?
Its data sheet carries the ETL mark. The Intertek directory lists the GB40 as evaluated to UL 2743, the portable power pack standard.
Check the Boost Plus GB40 listing on Amazon (paid link)