NOCO Boost Sport GB20 Jump Starter: Specifications and Safety Notes
At a glance
- What it is: A compact lithium jump starter and USB power bank from NOCO, rated at 500 A, with a built-in LED torch.
- Key specifications: 500 A; petrol (gas) engines up to 4.0 litres; up to 20 jump starts per charge; IP65 enclosure; about 2.4 lb (1.1 kg).
- Suits: Drivers of petrol cars up to 4.0 litres who want a small unit with reverse-polarity protection.
- Skip if: You have a diesel. NOCO’s page for this model gives an engine limit for petrol only.
We haven’t tested this product ourselves. This page summarises the manufacturer’s specifications, checked 18 October 2026. The specifications come from a copy of NOCO’s US product page, because NOCO’s own site would not load for us. We compared them with a UK retailer’s listing, and the main figures match.
Specifications
| Specification | Detail | Source |
|---|---|---|
| Model | GB20 Boost Sport UltraSafe, 12V | [1] |
| Rated output | 500 A | [1] |
| Engine size | Petrol (gas) engines up to 4.0 litres. No diesel limit stated on this page | [1] |
| Jump starts per charge | Up to 20 | [1] |
| Enclosure | Water-resistant, rated IP65 | [1] |
| Weight | 2.4 lb (about 1.1 kg, converted) | [1] |
| Safety features | Spark-proof design; reverse polarity protection (NOCO’s description) | [1] |
| Recharging | From any powered USB port; NOCO says about 3 hours at 2.1 A | [1] |
| USB power bank | Can recharge phones and tablets; NOCO says up to 4 smartphone recharges | [1] |
| Torch | 100 lumens, seven modes including SOS and strobe | [1] |
| Lowest battery voltage | Designed to jump 12V lead-acid batteries down to 2 V; manual override below that | [2] |
| Retry limit | No more than 5 jump starts within 15 minutes, then rest for 15 minutes | [3] |
| Dimensions | 196 × 80.3 × 43.4 mm (UK seller’s listing) | [6] |
| Box contents | Precision Boost battery clamps and a cloth pouch (UK seller’s listing) | [6] |
| Warranty | 1 year (UK seller’s listing) | [6] |
| UK price | £81.99 including VAT at Tayna on 18 October 2026 | [6] |
What owners report
Based on the 5 most recent of 16 UK reviews on Tayna, read on 18 October 2026 (rated 5.0 on average) [6]. This is a small sample, and all five were positive.
- Reviewers describe it as lightweight, compact and easy to use, and a better option than carrying jump leads.
- They mention using it on a motorbike, on cars and to charge an electric car’s utility battery.
- One reviewer reported over two years of use without a fault. One bought the optional protective case and noted that a cloth pouch comes as standard.
We saw no complaints in this sample, so it tells you little about how often faults occur.
Known issues and safety
Recall check: we searched GOV.UK product safety alerts, reports and recalls (Office for Product Safety and Standards) for “NOCO”, “NOCO Boost GB20” and “NOCO jump starter” on 18 October 2026. No notice naming NOCO was found [4]. The search did return recalls for other brands of jump starter, so check that you are buying a genuine NOCO unit from a seller you trust.
From NOCO’s support pages:
- Turn off the vehicle’s power loads (headlights, radio, air conditioning) before jump starting [3].
- If the clamps are connected the wrong way round, a red error light comes on. Reverse the connections to clear it [3].
- Manual override forces the jump-start function on for a battery below 2 V. NOCO warns that all safety features are disabled when it is used, and that it does not add power [2].
- Allow the unit to rest after repeated attempts, as in the retry limit above [3].
Questions people ask
Is the GB20 500 A or 400 A?
NOCO rates it at 500 A [1]. Some listings and older write-ups use 400 A. We could not find a NOCO page that supports that figure.
Will it start a diesel?
NOCO’s page for this model gives an engine limit for petrol engines only (up to 4.0 litres) [1]. For diesel, NOCO’s larger GB50 lists diesel engines up to 4.5 litres [5].
Can it start a completely flat battery?
NOCO says the unit is designed to jump 12V lead-acid batteries down to 2 V. Below that, it offers a manual override that disables its safety features [2].
How long does it take to recharge?
NOCO says about 3 hours from a USB port at 2.1 A [1].
Alternatives
- NOCO GB40 (1000 A): NOCO’s next model up in this range, listed as a 12V 1000 A jump starter [1].
- NOCO GB50 (1500 A): Rated for petrol engines up to 7.0 litres and diesel up to 4.5 litres [5].
Our verdict
Based on the evidence, this suits drivers of petrol cars up to 4.0 litres who want a small, spark-protected jump starter that doubles as a USB power bank. Look elsewhere if you drive a diesel or a larger engine. This is a research summary, not a test result.
Sources
- GB20 500A 12V Boost Sport UltraSafe Jump Starter (NOCO US product page, Internet Archive copy dated 30 December 2025), NOCO, web.archive.org. Checked 18 October 2026.
- Using Manual Override on GB20, NOCO support (Internet Archive copy), web.archive.org. Checked 18 October 2026.
- How to Jump Start Using GB20, NOCO support (Internet Archive copy), web.archive.org. Checked 18 October 2026.
- GOV.UK search of product safety alerts, reports and recalls, www.gov.uk. Searched 18 October 2026.
- GB50 1500A 12V Boost XL UltraSafe Jump Starter (NOCO US product page, Internet Archive copy), NOCO, web.archive.org. Checked 18 October 2026.
- NOCO GB20 Boost Sport 500A UltraSafe Lithium Jump Starter with Power Bank, Tayna, www.tayna.co.uk. Checked 18 October 2026.