Noco GB20 Boost Sport
(53 reviews)
The smallest Noco, the one that genuinely fits in a motorcycle's underseat storage: 500 amps, a kilo, and the same UltraSafe protection as its big brothers.
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Characteristics
- Output: 500 peak amps (petrol up to 4.0 L)
- Endurance: Up to 20 jump starts per charge
- Safety: UltraSafe, spark-proof and reverse-polarity proof
- Format: 196 x 80 x 43 mm, around 1 kg, IP65
- Pocket format, for bikes and small petrol cars
Detailed overview: Noco GB20 500A jump starter
The Noco GB20 Boost Sport is the entry model in the American brand's range of lithium emergency jump starters. It delivers 500 peak amps at 12 volts, enough to restart a petrol engine of up to 4.0 litres even with the vehicle battery completely flat, with no second vehicle and no conventional jump leads.
That deliberately measured output defines its playing field: petrol city cars and hatchbacks, motorcycles, scooters, quad bikes, jet skis, ride-on mowers and small leisure boats. Noco quotes up to twenty jump starts from a single charge of its 24 watt-hour lithium-ion battery, and the unit holds its charge for several months at rest, which matters for an object that spends most of its life waiting in a boot.
Safety is the brand's central argument and it has not been diluted on this model. UltraSafe technology keeps the clamps inert until they are correctly connected: no spark on contact, and reverse polarity is detected then blocked. That is the fundamental difference from a pair of conventional leads, where a wiring mistake can damage the onboard electronics.
The enclosure is IP65 rated, so protected against dust and water jets, and it works from -20 to +50 °C. Two secondary functions round things off: a 2.1 amp USB port to rescue a phone, and a 100-lumen LED torch with seven modes including SOS and strobe, both useful on the hard shoulder. The charging input is 10 W USB-C and a microfibre storage bag is supplied.
If your vehicle is a diesel, or a petrol above four litres, the GB20 is not the right choice: look instead at the Noco GB50 Boost XL or the GB40 Boost Plus. And for a large diesel van, the GBX75 remains the reference of the range.
EAN: 0046221150018
User manual / Instructions for use (PDF)
Comparison
The GB20 competes first with its own siblings: the debate is less about the brand than about how many amps you genuinely need.
| Criterion | Noco GB20 | Noco GB40 | Noco GB50 | Gooloo GT3000 |
|---|---|---|---|---|
| Peak current | 500 A | 1000 A | 1500 A | 3000 A |
| Petrol | Up to 4.0 L | Up to 6.0 L | Up to 7.0 L | All sizes |
| Diesel | Not certified | Up to 3.0 L | Up to 4.5 L | Up to 8.0 L |
| LED torch | 100 lumens | 100 lumens | 200 lumens | Yes |
| Observed price | ≈ 84 € | ≈ 122 € | ≈ 124 € | ≈ 61 € |
The reasoning is simple. If you only own a small petrol car or a motorcycle, the GB20 does the job for forty euros less than the GB40 and in a far more portable format. As soon as a diesel joins the garage it becomes unsuitable and the GB50 takes over. Finally the Gooloo GT3000 quotes six times the amps for less money: it wins on paper, the GB20 wins on compactness, build quality and the reputation of a brand that has equipped workshops for twenty years.
Related video
Video: How to jump start using your NOCO Boost GB20 - Published on 07/02/2020
Our tester's review: Gilles Caron
There is a classic mistake when buying a jump starter: reaching for the most powerful one out of reflex, when you actually own a city car or a motorcycle. The GB20 exists for those cases, and it covers them very well. Its 500 amps are ample to restart a four-cylinder petrol engine of under four litres, which takes in almost the entire urban fleet, motorcycles, quad bikes, jet skis and ride-on mowers. What you gain in exchange is the format: under a kilo, the size of a thick large phone, it genuinely fits under a motorcycle seat or in a door pocket, which a GB70 does not. And a jump starter you actually carry beats one left in the garage. Safety has not been trimmed for all that. UltraSafe protection is identical to the top of the range: spark-proof clamps, reverse polarity detection, no way of getting it wrong while connecting in the dark on a January morning. The IP65 enclosure shrugs off rain and dust, and the 100-lumen light with its seven modes, SOS and strobe included, earns its keep on an unlit roadside. Two limits to know before buying. The GB20 does not do diesel: Noco only certifies it for petrol, and you need the GB40 or GB50 as soon as an oil burner is involved. Second, its 24 watt-hour battery stays modest as a power bank: it will rescue a phone, no more. At under ninety euros it is the most honest entry ticket to Noco reliability.
Frequently asked questions: Noco GB20 500A jump starter
Noco only certifies it for petrol engines up to 4.0 litres. A diesel demands far more cranking torque, so you need to step up to the GB40, the GB50 or the GBX75 depending on capacity.
That is its natural home. At under a kilo and the size of a large phone, it stows under a seat or in a tank bag where a GB70 simply will not fit. Its 500 amps are far more than a motorcycle battery ever needs.
Nothing. UltraSafe technology keeps the clamps inert until the connection is correct and detects reverse polarity. That is precisely what separates a modern jump starter from a pair of conventional jump leads.
Several months at rest, but good practice is to top it up two or three times a year and always before winter. A jump starter that is flat on the day of the breakdown is useless: that is the only real trap with this type of device.
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Published on 26/07/2026