Pick a jump starter by engine size
The engine rating is the number that tells you whether a jump starter fits your vehicle. Peak amps rise with it, but we have not found a published standard that defines them, so we sort by engine size first.
Checked against sources on by the TrueAmps editorial team.
Smallest unit that covers your engine
Find your engine size in the owner's manual or on the registration, then read down the gas or diesel column to the first model at or above it. All eight are listed to UL 2743 in the Intertek directory.
| Model | Gas up to | Diesel up to | Peak A | Battery | Weight | UL 2743 |
|---|---|---|---|---|---|---|
| NOCO Boost Sport GB20 | 4.0 L | no | 500 | 24 Wh | 2.1 lb | Listed |
| NOCO Boost Plus GB40 | 6.0 L | 3.0 L | 1,000 | 24 Wh | 2.45 lb | Listed |
| NOCO Boost X GBX45 | 6.5 L | 4.0 L | 1,250 | 31 Wh | 2.16 lb | Listed |
| NOCO Boost X GBX55 | 7.5 L | 5.0 L | 1,750 | 46 Wh | 2.58 lb | Listed |
| NOCO Boost HD GB70 | 8.0 L | 6.0 L | 2,000 | 56 Wh | 4.18 lb | Listed |
| NOCO Boost X GBX75 | 8.5 L | 6.5 L | 2,500 | 74 Wh | 3.77 lb | Listed |
| NOCO Boost Pro GB150 | 9.0 L | 7.0 L | 3,000 | 88 Wh | 6.39 lb | Listed |
| NOCO Boost X GBX155 | 10.0 L | 8.0 L | 4,250 | 99 Wh | 5.82 lb | Listed |
Two lines from one maker
NOCO sells two families side by side. The original Boost (GB20 to GB150) and the newer Boost X (GBX45 to GBX155). Model for model, the Boost X units on NOCO's spec pages carry higher ratings and larger batteries for similar weight, and charge over USB-C at up to 20 volts. The GB70 and GB150 keep a 12 volt accessory output that the Boost X spec pages do not list.
Diesel is where the lines differ most. The GB20 is not recommended for diesel at all; the GB40 stops at 3.0 liters; the GBX45 reaches 4.0.
Why peak amps are not in the first column
Peak amps are the headline on every box, and the one figure without a published standard that would let buyers compare it across brands. Peak amps, explained goes through what the number can and cannot tell you.
Not sure whether a jump starter you found elsewhere is safety listed? The registry check shows how to look it up yourself. First time using one? How to use a NOCO Boost.
Compare two models
Questions people ask
What size jump starter do I need?
Pick by the engine rating the maker publishes, gas and diesel separately. Find your engine size in liters and choose the smallest model rated at or above it; the table on this page is sorted that way.
Can a jump starter start a diesel?
Only within its diesel rating. NOCO lists diesel as not recommended for the GB20 and rates the others from 3.0 L (GB40) up to 8.0 L (GBX155).
Are NOCO jump starters UL listed?
All eight NOCO models on this site appear in Intertek directory records for portable power packs evaluated to UL 2743, checked September 24, 2026. Each model page links its record.
How do I use a NOCO Boost?
Attach the clamps, power on, start the vehicle, power off. Our how-to page covers what the lights mean.