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A flat car battery never happens at a convenient time. Especially when you’re setting off in your motorhome, parked up or driving a diesel SUV. The GOOLOO GT4000S 4000A jump starter is designed as a portable emergency starter for 12V vehicles, with extra features including fast charging, a power bank and a torch.
However, a high amp rating alone isn’t a reason to buy. Read on to find out which specifications matter, which marketing claims to treat with caution and what this lithium jump starter may be suitable for.
A rating such as 4000A peak cranking power refers to the maximum peak current. It’s not the same as a current that the device can deliver for an extended period. Actual performance also depends on:
According to the product description, the GT4000S is designed for 12V petrol engines up to 12.0 litres and diesel engines up to 10.0 litres. These are the manufacturer’s stated compatibility specifications; they don’t guarantee that every flat or faulty battery will start.
A powerful car jump starter needs to suit both your vehicle and how you use it. A petrol car generally needs less starting power than a large diesel engine, but accessories such as a parking heater, fridge or inverter can also put a strain on the battery.
Before you buy, check:
The GT4000S is listed in the product information as suitable for cars, SUVs, pick-ups, motorhomes, motorbikes, boats, tractors and other 12V vehicles.
A jump starter with a compressor sounds appealing, but according to the supplied product specifications, the GT4000S doesn’t have a built-in compressor. It does have a 15V/10A output for certain DC devices, such as a tyre inflator or inverter. This doesn’t mean the jump starter itself can inflate tyres.
Also look for:
According to the product description, the model has ten safety features and a 3.2-inch LED display. Check the latest manual and safety instructions before use.
The GT4000S is a 12V jump starter with a stated peak output of 4000A. According to the product description, it’s suitable for petrol engines up to 12.0 litres and diesel engines up to 10.0 litres. That’s well above the minimum requirement for a compact petrol car; the extra headroom may be useful for a motorhome, boat, large SUV or commercial vehicle.
Don’t use a jump starter as a substitute for a faulty battery. If your battery keeps going flat, it’s a good idea to have the cause checked.
According to the product information, the built-in battery can be charged at up to 100W. The manufacturer says a full charge from empty takes around 1.2 hours using the supplied 100W car charger. The USB-C port can also be used with compatible devices, including laptops.
Actual charging time depends on the charger and cable you use, the temperature and the remaining battery capacity. Always check that your own USB-C charger supplies enough power.
As well as being an emergency starter, the device works as a jump starter with a power bank. The product description lists three USB ports and a 400-lumen torch with three modes: SOS, spotlight and strobe. This can be handy if you break down in the dark or need to charge your phone.
The claimed maximum of 60 starts per full charge comes from the manufacturer’s product information. How many starts you’ll actually get depends on the vehicle, battery condition and circumstances.
Why it suits this user: For anyone looking for one device for a 12V petrol car and roadside emergencies, without having to carry separate jump leads and a power bank.
The product description lists more than just 4000A: it also specifies 12V compatibility, a status display, safety features and included cables.
100W charging, three USB ports, a 400-lumen torch and a storage bag, according to the product details.
Why it suits this user: For drivers who value clear information about the charge status and connections, and also want to charge laptops or mobile devices.
The specifications distinguish between jump-starting, charging and powering devices. The stated 15V/10A output is not a built-in compressor.
Two-way USB-C charging up to 100W and an informative 3.2-inch display, according to the manufacturer.
Why it suits this user: For motorhome and boat owners, SUV drivers and professionals who want to keep a portable jump starter for diesel or petrol vehicles in their vehicle.
The stated support for diesel engines up to 10.0 litres and the heavy-duty jump leads make it suitable for larger vehicles. Always check your vehicle’s manual.
According to the product description, it can provide up to 60 starts per full charge. It also has a torch, power bank and 15V/10A output.
We’ve put together a complete, up-to-date list of products that meet these strict selection criteria and the applicable European safety regulations.
First, check that your vehicle uses a 12V system. Charge the jump starter sufficiently, connect the red clamp to the positive terminal and the black clamp to the negative terminal or a suitable earth point, as instructed in the manual. Wait for the correct status to appear on the display, then try to start the vehicle. Don’t run the starter motor for too long. Once the engine has started, remove the clamps in the order specified in the manual.
According to the product description, the GT4000S can remain on standby for up to 24 months. This is a product claim made by GOOLOO, not a guarantee for every storage condition. Store the device in a dry place, avoid extreme temperatures and check the charge level regularly.
The GT4000S is primarily a jump starter, not a fully featured trickle charger for long-term battery maintenance. The USB ports and 15V/10A output are designed to power compatible devices. You may need a separate battery charger to fully charge or maintain a car battery.
