NOCO Boost X GBX45
The GBX45 is rated at 1,250 amps peak for gas engines up to 6.5 liters and diesel engines up to 4.0 liters, with a 31 Wh battery and USB-C charging in both directions.
Checked against sources on by the TrueAmps editorial team.
- Peak current
- 1,250 A
- Internal battery
- 31 Wh
- Gas engines up to
- 6.5 L
- Diesel engines up to
- 4.0 L
- Weight
- 2.16 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 X GBX45 on Amazon (paid link)
Engine rating against the rest of the line
GBX45 or GB40
On paper the GBX45 is the GB40 moved up a notch: 250 more peak amps, half a liter more gas engine, a full liter more diesel (4.0 against 3.0), and 31 Wh against 24.
The bigger practical change is charging. NOCO lists USB-C input up to 20 volts at 3 amps, and the same port can output up to 20 V at 3 A, which is 60 W, to other USB-C devices.
It weighs 2.16 lb on NOCO's spec page, lighter than the GB40's listed 2.45 lb.
Next size down and up
| Model | Peak A | Wh | Gas L | Diesel L |
|---|---|---|---|---|
| NOCO Boost X GBX45 | 1,250 | 31 | 6.5 | 4.0 |
| NOCO Boost Plus GB40 | 1,000 | 24 | 6.0 | 3.0 |
| NOCO Boost X GBX55 | 1,750 | 46 | 7.5 | 5.0 |
All jump starters side by side
Head to head: GB40 vs GBX45
Boost X GBX45: questions people ask
Does the GBX45 charge over USB-C?
Yes. NOCO lists USB-C input and output up to 20 V at 3 A.
Is the GBX45 UL 2743 listed?
Yes, it appears in two Intertek directory records for NOCO portable power packs evaluated to ANSI/CAN/UL 2743, checked September 24, 2026.
Check the Boost X GBX45 listing on Amazon (paid link)