Descrizione
A Flat Battery Does Not Care That You Are Late. It happens in a car park at night, in a lay-by in February, and at the moment the ferry is boarding. What decides whether the day continues is a pack that will still deliver after months in a boot, and a claimed cold rating that turns out to be real when you are the one holding it.
The GT4000 carries a 24,000 mAh 3.7 volt lithium pack built from four cells, rated for more than a thousand cycles and for a peak output of 4,000 amps with a starting current of 800 amps sustained over three seconds. That translates into a gas engine rating up to 12.0 litres and a diesel rating up to 10.0 litres, which covers the vehicles most roadside calls involve. It offers roughly forty ignitions from a full charge, and the pre-heating technology is designed for cold starts down to minus forty, which is the specification that matters on the morning when nothing else works.
The charging side is where it separates from the older generation of boosters. Two-way fast charging at up to 100 watts refills the pack from empty in under 1.2 hours, with a five minute top-up restoring 20 percent, and the same port charges a laptop at 100 watts through USB-C power delivery. A second USB output runs Qualcomm Quick Charge 3.0 at 18 watts, a third runs 5 volts at 2.4 amps, and the DC output supplies 15 volts at 10 amps for 150 watts. A 3.2 inch LED screen shows battery level, operating status and error codes rather than leaving you to interpret a row of dots. Ten built-in protections guard the output, the housing is waterproof, and the light offers illumination, SOS and strobe modes at 400 lumens.
Cold mornings are a specification, not an excuse.
Key Features
- ✦ 4,000 A peak output with 800 A starting current sustained over three seconds
- ✦ 24,000 mAh 3.7 V lithium pack built from four cells, rated for over 1,000 cycles
- ✦ Gas engine rating up to 12.0 litres and diesel engine rating up to 10.0 litres
- ✦ Pre-heating technology designed for cold starts down to minus forty
- ✦ Two-way fast charging at up to 100 W, refilling from empty in under 1.2 hours
- ✦ Five minute charge restores 20 percent, ready for an immediate jump start
- ✦ USB-C power delivery output at up to 100 W for laptops, plus Quick Charge 3.0 at 18 W and a DC output at 150 W
- ✦ 3.2 inch LED screen showing battery level, status and error codes, with a 400 lumen light in illumination, SOS and strobe modes
Technical Specifications
- Brand: GOOLOO
- Model: GT4000
- Battery capacity: 24,000 mAh at 3.7 V, four built-in cells
- Battery cycle life: Over 1,000 cycles
- Peak current: 4,000 A (listed alongside a greater than 1,200 A rating)
- Starting current: 800 A for 3 seconds
- Jump start output: 12 V
- Gas engine rating: Up to 12.0 L
- Diesel engine rating: Up to 10.0 L
- Ignitions per charge: Approximately 40
- Charging time: Under 1.2 hours from empty at 100 W; 20 percent in 5 minutes
- Charging method: Two-way fast charging, 100 W
- USB-C output: Power delivery, up to 100 W
- USB 1 output: Quick Charge 3.0, up to 18 W (5 V 3 A, 9 V 2 A, 12 V 1.5 A)
- USB 2 output: 5 V at 2.4 A
- DC output: 15 V at 10 A, up to 150 W
- Display: 3.2 inch LED screen with battery level, status and error codes
- Light output: 400 lumens, illumination, SOS and strobe modes
- Operating temperature: Listed as minus 40 to minus 60, with pre-heating rated for cold starts at minus 40
- Conversion rate: 85 to 90 percent
- Protections: Ten built-in protections, SUPER SAFE registration 5904374
- Weight: 2.1 kg
- Water resistance: Waterproof
- Certification: UL, RoHS, MSDS, FCC, CE
- Warranty: 365 days, plus 365 additional days for registered GOOLOO owners
Where It Belongs
The boot of a car that sits unused for weeks is the first home for a pack like this, because a booster that has to be charged before it can help is a booster that fails. Diesel owners get the 10.0 litre rating, which is the figure that covers vans and light commercials rather than only passenger cars. Cold-climate drivers have the clearest case: the pre-heating function exists because lithium chemistry loses output in freezing weather, and the minus forty cold-start rating is what makes the difference between a start and a tow. Because the pack charges a laptop at 100 watts over USB-C and delivers Quick Charge 3.0 on a second port, it doubles as the power bank that travels instead of the smaller one in a bag. The 150 watt DC output runs tyre inflators, inverters and 12 volt accessories away from a vehicle socket. Fleet and site managers use one per vehicle and log the three-second starting current against the engine rating, which is the specification that tells them in advance whether a given machine is covered.
The EastSupplier Promise
Every unit is inspected before it leaves the warehouse. If a specification on this page does not match what arrives, we cover the return shipping and replace it. English-language support answers within one business day, and replacement parts for this category are stocked so a working unit stays working.
Frequently Asked Questions
Q: What size engine will it start?
Up to 12.0 litres for petrol and up to 10.0 litres for diesel according to the manufacturer ratings. The three-second starting current is 800 amps with a 4,000 amp peak, and a full charge delivers around forty ignitions.
Q: How long does it take to charge, and how fast can I use it?
A full charge from empty takes under 1.2 hours at 100 watts through two-way fast charging. A five minute connection restores 20 percent, which is enough for an immediate jump start.
Q: Will it work in freezing weather?
The pre-heating technology is designed for cold starts at minus forty, which is the manufacturer's answer to lithium output loss in low temperatures. The specification lists an operating temperature range of minus 40 to minus 60.
Q: Can I use it as a normal power bank?
Yes. The USB-C port delivers up to 100 watts of power delivery, which will charge a MacBook or similar laptop, and the second USB port runs Quick Charge 3.0 at up to 18 watts. A third port provides 5 volts at 2.4 amps for phones and accessories.
Q: What does the screen show?
The 3.2 inch LED screen reports battery level, operating status and specific error codes, so a failed start can be diagnosed rather than guessed at. The light element runs at 400 lumens in illumination, SOS and strobe modes.
Q: How safe is it to leave connected?
Ten built-in protections are listed, covering the output against the fault conditions that damage batteries and vehicles, and the unit carries UL, RoHS, MSDS, FCC and CE certification. It is also rated waterproof.
Q: What is the warranty?
365 days as standard, with an additional 365 days for registered GOOLOO owners, taking the cover to two years for a registered unit.
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