GOOLOO GP4000 review: who it suits, who should skip it

We have not tested the GP4000. This page is built from GOOLOO's product page, the Amazon.co.uk listing and public owner reviews. Every figure below is taken from one of the sources listed at the bottom.

Key specs

GOOLOO's US product page advertises a warranty of up to 30 months; the Amazon.co.uk listing states 18 months, so plan on 18 if you buy in the UK. Neither page we read gives a weight we could confirm.

What the numbers mean in a UK car

• 10.0 L diesel. That ceiling covers any diesel car, van or pick-up most UK drivers will own. The practical benefit is headroom on a cold morning with a tired battery, not the ability to start something exotic.
• 60-plus starts and 24-month standby. These matter if the pack lives in the boot and gets forgotten. GOOLOO still recommends a top-up every 3 months, which is the figure to plan around.
• 20,000 mAh. Jump starter mAh figures are quoted without a voltage, so this number cannot be compared directly with another brand's mAh. Use rated engine size and starts per charge.
• 15 V, 10 A output. GOOLOO says this can run an air compressor or car fridge. Check the input rating of whatever you plan to plug in before relying on it.

Who it suits

• Drivers of large diesels, vans and 4x4s who want one pack with plenty of margin.
• Households that will use one jump starter across several cars, where 60-plus starts per charge is useful.
• People who want a single device for jump starts, phone charging and powering a compressor. Our emergency kit essentials guide covers what to pack alongside it.

Who should skip it

• Owners of a single small petrol car who want the smallest pack: a lower-rated model such as the NOCO GB40 is sized for that job.
• Anyone with a 24 V truck or plant system: GOOLOO limits the GP4000 to 12 V vehicles.
• Buyers who put brand support first. GOOLOO's direct customer service draws many complaints (see below), so buying through Amazon.co.uk, where Amazon's returns process applies, is the safer route.

What owners report

We could not read the Amazon.co.uk review text, only the rating. The themes below come from the owner reviews shown on GOOLOO's own product page and from Trustpilot reviews of GOOLOO as a company.

• Starts in difficult conditions. Reviewers on GOOLOO's page describe starting cars in cold weather, vehicles that had been laid up for a long time, and diesel equipment.
• Size. Several mention it fits a glovebox or a toolbox, which matters because a jump starter left at home is no use.
• Clamp and cable complaints. The negative reviews we read mention a clamp indicator that stayed red, a unit that failed to start a dead battery, and leads that got hot.
• Company support. Trustpilot reviews of GOOLOO are dominated by complaints about direct-site orders, missing parts and slow replies. Only one we read named the GP4000, and it concerned delivery, not performance.

On Amazon.co.uk, filter to 1-star and 3-star reviews and search for "won't charge", "red light" and "after a year" to see how units hold up once the 3-month top-up schedule slips.

How it compares

NOCO GB40. NOCO rates the GB40 at 1000A, up to 6.0 L petrol and 3.0 L diesel, with up to 20 starts per charge and no 12 V output socket. It is the smaller, simpler pick for an ordinary car; the GP4000 wins on rated engine size, starts per charge and outputs. Peak amps are each maker's own rating, so do not read 4000A against 1000A as a like-for-like ratio. See ourNOCO GB40 review and theGB40 vs GP4000 comparison.

If you are still choosing between a jump starter and traditional leads, read jump starter vs jump leads, and for storage habits seehow long a jump starter holds its charge. The wider shortlist is on best emergency kits.

Frequently asked questions

Is 4000A overkill for a small petrol hatchback?

For starting the engine, yes: GOOLOO rates it for every petrol engine and diesels up to 10.0 litres, far beyond a 1.0 or 1.2-litre hatchback. The headline amps are not the reason to buy it for a small car. The more useful numbers are the claimed 60-plus starts per charge, the 24-month standby claim and the 15 V, 10 A output.

How often should I recharge the GP4000?

GOOLOO claims up to 24 months of standby from full, but its own FAQ recommends recharging every 3 months. Follow the 3-month figure. A pack that sits at a low charge through a winter is the one that lets you down on a frosty morning.

Can I charge it from the car's 12 V socket?

Yes. The Amazon.co.uk listing includes a cigarette lighter adapter, and GOOLOO quotes about 5 hours from the car charger. Check whether your socket stays live with the engine off before leaving it charging in a parked car; see our page on whether a 12 V socket works with the engine off.

Why did it stop working after several starts in a row?

GOOLOO lists over-start protection that engages after more than 4 starts within 2 minutes. If the engine will not catch after a few attempts, stop, let the pack rest, and check for a fault other than the battery, such as a failed starter motor or a fuel problem.

More on charging from the car:does a 12 V socket work with the engine off?