The heavy hitter of the lineup, for the most demanding engines
Facing large diesel engines or very deeply discharged batteries, the Gooloo GP4000 bets on raw power: a 4000A peak, versus 3000A for its sibling the GT3000, to cover a wider range of vehicles.
4000A and over 60 starts per charge
With a 4000A peak current, the GP4000 starts all gas engines and diesels up to 10 liters, broad coverage that includes larger vans and RVs. Its 26800mAh battery allows, according to the product page, over 60 starts on a single full charge, comfortable margin for helping several vehicles or staying ready for a long time in the boot. This peak current figure remains manufacturer data, with no independent measurement to confirm it.
No information on cold-weather performance
As with the GT3000 from the same brand, no operating temperature range or cold-weather performance is stated on the product page. Yet cold weather is exactly when a car battery is most likely to refuse to start, precisely the situation where a jump starter needs to prove its worth. With no data on this point, there is no way to know how the GP4000 actually behaves below freezing.
Power bank and LED light, but an unstated charging power
The 26800 mAh internal battery turns the GP4000 into a power bank able to charge smartphones, tablets and small devices, via a USB QC 3.0 port (fast charge) and a USB-C port for input and output. A 3-mode LED light (steady, strobe, SOS) rounds out the set for a night-time breakdown. Unlike the GT3000, the product page does not state the USB-C port's power in watts, making it impossible to precisely compare charging speed between the two models.
Acknowledged weight and bulk, with no stated warranty duration
The smart clamps include a system of 10 protections (reverse polarity, short circuit, overload, overheating...), for a secure connection even for a non-expert user.
Against the Gooloo GT3000 and the Noco GB40 and GBX75
How does the GP4000 compare with other jump starters?
| Criterion | Gooloo GP4000 | Gooloo GT3000 | Noco GBX75 |
|---|---|---|---|
| Peak current | 4000A | 3000A | 2500A |
| Diesel start | Up to 10L | Up to 6L | Up to 6.5L |
| Fast charge | USB QC 3.0 + USB-C | 65W (USB-C PD) | Not stated |
| Observed price | £76.96 | £69.99 | Not stated |
The GT3000, cheaper, covers typically sized engines with a better-specified fast charge (a stated 65W). The Noco GBX75 bets on brand ruggedness and reputation, with a lower peak current. For the largest diesel engines, up to 10 liters, the GP4000 remains the only one in this line-up covering such a size.
Who the Gooloo GP4000 is for
This jump starter suits anyone with a large van, an RV or a big diesel vehicle, wanting maximum current margin. For family use on typically sized engines, with a bit less weight and a better-specified fast charge, the Gooloo GT3000 from the same brand is plenty.
