NOCO Boost Sport GB20
The GB20 is the smallest Boost: 500 amps peak, a 24 Wh battery, and a rating for gas engines up to 4.0 liters. NOCO lists diesel as not recommended.
Checked against sources on by the TrueAmps editorial team.
- Peak current
- 500 A
- Internal battery
- 24 Wh
- Gas engines up to
- 4.0 L
- Diesel engines up to
- Not recommended
- Weight
- 2.1 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 Sport GB20 on Amazon (paid link)
Engine rating against the rest of the line
Which vehicles it is meant for
Check your engine size against that 4.0 L line before you buy. It is printed in the owner's manual and usually on the registration.
Here is the detail most listings skip. The GB20 carries the same 24 Wh battery as the GB40, yet NOCO rates it at half the peak current and a smaller engine range. The difference is in how much current the unit is built to deliver, not in how much energy it stores. If your engine is over 4.0 liters, or diesel, the GB20 is the wrong size.
Next size down and up
| Model | Peak A | Wh | Gas L | Diesel L |
|---|---|---|---|---|
| NOCO Boost Sport GB20 | 500 | 24 | 4.0 | - |
| NOCO Boost Plus GB40 | 1,000 | 24 | 6.0 | 3.0 |
All jump starters side by side
Head to head: GB20 vs GB40
Boost Sport GB20: questions people ask
Can the NOCO GB20 start a diesel?
NOCO lists the GB20 diesel rating as "Not Recommended" on its spec page. For small diesels NOCO rates the GB40 up to 3.0 liters.
Is the GB20 UL 2743 listed?
Yes. The GB20 appears in the Intertek directory listing for NOCO portable power packs evaluated to UL 2743, checked September 24, 2026.
Check the Boost Sport GB20 listing on Amazon (paid link)