NOCO Boost GB20 500A UltraSafe Jump Starter
- Jump Starter
- More reviewed than 65%
A small, light jump starter for gas engines up to 4.0L, built around spark-proof UltraSafe clamps rather than raw peak power.
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How it ranks among the 17 jump starters we track
4.6★ across 13,100 Amazon ratings, Bayesian-smoothed toward the category average.
13,100 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
3,000+ bought on Amazon last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 17 jump starters we track - how the scorecard works · full jump starters data report. Confidence: limited - incomplete product information.Updated 8 days ago. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
A compact 500-amp lithium jump starter rated for gasoline engines up to 4.0L, weighing 2.4 lbs so it fits a glovebox or small emergency kit. Suits owners of smaller cars, motorcycles or ATVs who want a lightweight backup rather than a heavy-duty unit.
NOCO pitches this as the small end of its Boost line: enough peak amperage for smaller engines, spark-proof clamps, and a power bank and flashlight built in, but it is explicitly sized for 4.0L gas engines rather than diesels or larger trucks. The UltraSafe clamp design is the notable engineering detail, since it is built to prevent a spark or reverse-polarity connection rather than just warn about one.
- Up to 20 jump starts per charge
- 100-lumen LED flashlight with 7 modes including SOS
- USB-C charging, full recharge in about 3 hours
- 1-year warranty, engineered in the USA
Who it's for
Good fit for someone with a car, motorcycle, ATV or boat under 4.0L who wants a small, light unit to keep on hand. Not sized for diesel engines or larger trucks, which NOCO covers with bigger units in the same line.
Strengths and trade-offs
Drawn from this product's published specifications.
- Spark-proof and reverse-polarity clamp design
- Only 2.4 lbs, sized for a glovebox
- Doubles as a phone power bank between jumps
- Rated to 4.0L gas engines only, not diesel or larger trucks
Performance notes
The UltraSafe clamp system is engineered so a wrong or reversed connection simply will not spark or complete a circuit, rather than relying on the user to check polarity first. At 2.4 lbs with a 500-amp peak rating, it trades raw power for portability, delivering around 20 starts per charge on qualifying engines and recharging its own battery in about 3 hours.
Specifications
| Brand | Noco |
|---|
Other Noco jump starters
How it compares
This product against the closest alternatives we track in jump starters.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| NOCO Boost GB20 500A UltraSafe Jump StarterThis product | 4.6 / 5 | 13,100 | 2.7 / 5 |
| Clore Automotive Jump-N-Carry JNC660 1700 Peak Amp 12 Volt Jump StarterClore Automotive | 4.6 / 5 | 19,800 | 4.8 / 5 |
| Hulkman Alpha85 Smart Portable Jump StarterHulkman | 4.7 / 5 | 13,400 | 4.5 / 5 |
| S ZEVZO ET03 Car Jump Starter 4000A Jump Starter Battery Pack for Up to 8.0L Gas and 7.0L…S Zevzo | 4.6 / 5 | 6,500 | 4.6 / 5 |
| WOLFBOX 4000A Jump StarterWolfbox | 4.7 / 5 | 5,900 | 4.6 / 5 |
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Questions about the Noco jump starters
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
What size engine will the NOCO Boost GB20 start?
NOCO rates the GB20 for 12V gas engines up to 4.0L, delivering up to 500 amps of peak current and around 20 starts per charge.
Is the NOCO Boost GB20 safe to connect the wrong way?
Its UltraSafe clamps use spark-proof and reverse-polarity protection, so an incorrect connection will not spark or damage the unit.
How long does the GB20 take to recharge?
The built-in power bank recharges in about 3 hours over its charging cable.