# NOCO Boost GB40 1000A UltraSafe Jump Starter Power Pack

Source: https://www.ranked10.co.uk/tech/best-jump-starter/noco-boost-gb40
Ranked #1 in "Best Jump Starter 2026: 10 Car Battery Boosters Ranked": https://www.ranked10.co.uk/tech/best-jump-starter

- Price: £92.19 (checked on Amazon UK on 2026-09-03)
- Amazon rating: 4.5 from 126,359 ratings
- Buy on Amazon: https://www.amazon.co.uk/dp/B015TKUPIC?tag=ranked10-21

The NOCO Boost GB40 is a 1000-amp lithium jump starter, and it takes first place in our jump starter ranking. Everything on this page comes from its Amazon listing rather than from our own testing: the price, the specification table, the spread of its customer ratings, and two review quotes copied word for word.

Two figures reward a closer look. The title sells the GB40 as a portable power bank, while the specification table puts its battery at 2,150mAh, which is a top-up rather than a full phone charge. And NOCO states up to 20 starts per charge on engines up to 6.0 litres of petrol, a figure worth reading next to the ratings breakdown below rather than on its own. Both come from the listing itself, so you can check either one.

## Specification

| Field | Value |
|---|---|
| Brand | NOCO |
| Model number | GB40 |
| Manufacturer part number | GB40 |
| Peak output current | 1000 Amps |
| Amperage | 1000 Amps |
| Voltage | 12 Volts |
| Battery cell composition | Lithium Ion |
| Battery capacity | 2150 Milliamp Hours |
| Compatible vehicle type | Boat, Moto, Passenger Car |
| Automotive fit type | Universal Fit |
| Item dimensions (D x W x H) | 11.7 x 20.8 x 10.7 centimetres |
| Item weight | 1.09 kg |
| Included components | GB40 Jump Starter Power Pack, Heavy Duty Jump Leads, Microfibre Storage Bag, USB-C Charging Cable |
| Number of items | 1 |
| Specification met (as listed) | CE |
| Manufacturer warranty | 1-Year Limited |
| EU spare part availability | 2 Years |
| Best sellers rank | 3 in Car Battery Jump Starters |
| ASIN | B015TKUPIC |

## Questions people ask

**Will the NOCO Boost GB40 start a diesel?**

The listing states it covers petrol engines up to 6.0 litres and diesel engines up to 3.0 litres, from 1000 peak amps. Above 3.0 litres of diesel NOCO points you at a bigger pack in the range, such as the GB70.

**How many jump starts do you get per charge?**

NOCO states up to 20 starts per charge on engines up to 6.0 litres of petrol. That is the figure on the listing rather than one we measured, and how close you get to it depends on the engine and how flat the battery is.

**Can it charge a phone?**

The specification table gives the battery as 2,150mAh. A typical phone battery is around 4,000mAh, so treat the power bank function as an emergency top-up rather than a full charge.

**What happens if I connect the clamps the wrong way round?**

NOCO states the GB40 has spark-proof technology and reverse polarity protection, so a wrong connection does not spark. That is the maker claim; we have not tested it.

**What comes in the box?**

The listing names the GB40 pack itself, heavy duty jump leads, a microfibre storage bag and a USB-C charging cable.

**How heavy is it and will it fit a glovebox?**

The specification table gives 1.09 kg and 11.7 x 20.8 x 10.7 centimetres, so it fits most gloveboxes and every boot.