NOCO
NOCO Boost GB20 UltraSafe 500A Lithium Jump Starter
Editor’s scorecard
Editorial scores from 0 to 10, comparable across products in this category.
Full specifications
Power & battery
| Power source | rechargeable battery |
| Peak current | 500 A |
| Uses per charge | 20 |
| Charge time | 3 h |
| Voltage | 12 V |
Size & build
| Weight | 1.09 kg |
| Dimensions | 11.7 x 20.8 x 10.7 cm (4.61 x 8.19 x 4.21 in) |
| Material | IP65-rated rubber-overmolded housing |
| Certifications | IP65 water/dust resistant |
Other details
| Peak amperage | 500A |
| Starts per charge | Up to 20 |
| Battery chemistry | Lithium |
| Protection | Spark-proof, reverse-polarity protection |
| Flashlight | 100-lumen LED, 7 modes including SOS and strobe |
| USB power bank output | Yes — charges phones and tablets |
The review
The GB20 is NOCO's entry point into the Boost line, and it's the right size for most everyday sedans, motorcycles, ATVs and small engines up to 4.0L — not the truck-and-SUV territory the GB50 covers. At 2.4 lbs it's noticeably smaller and cheaper while keeping the same UltraSafe spark-proof clamps that make the whole Boost line easy to trust for a first-time buyer.
Like the rest of the line, it doubles as a USB power bank and 100-lumen flashlight, so it earns its glovebox space even on days you don't need a jump. Charge time is quick at 3 hours, and it's rated for up to 20 starts per charge.
If your vehicle is a smaller engine, this is the more sensible buy over the GB50 — you're not paying for amperage headroom you'll never use.
Pros
- Spark-proof, reverse-polarity-protected clamps — hard to connect wrong
- Compact and light at 2.4 lbs, easy to keep in a glovebox
- Doubles as a USB power bank and 100-lumen flashlight
- Large, trusted review base (13,100+ at 4.6 stars) at a lower price than the GB50
Cons
- 500A ceiling means it's not meant for larger trucks or diesels — check your engine size first
- 1-year warranty is shorter than some competitors
- Smaller battery than the GB50, so fewer starts per charge
Ideal for: Owners of sedans, motorcycles, ATVs or small engines up to 4.0L who want a compact, trusted jump starter without paying for amperage they won't use.
What buyers say
With over 13,100 ratings at 4.6 stars, buyers consistently highlight the size-to-power ratio and safety clamps; a few note it's underpowered for larger trucks, which matches its stated 4.0L ceiling.
Summary based on reviews visible on Amazon at capture time.
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