GOOLOO 4000 Amp Jump Starter GT4000S Car Starter 100W Two-Way Fast-Charging Portable Car Battery Charger Jumper Starter for 12L Gas and 10L Diesel Engines, SuperSafe Jump Box for 12V Vehicles
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Features
- ONE & ONLY 100W Fast-Charging Car Battery Jump Starter: Only 1.2 hours can fully charge the jump box from 0% to 100%. 5 minutes of charging time are enough to start a car(100W car charger is included in the package). A single full charge can achieve 60 times jumpstart. You can also use your own fast-charging charger to charge this jump starter through the type-c port.
- Up to100W Charging Speed for MacBook & Other Laptops: Charge it whenever and wherever as fast as the original adaptor for your laptops(Type-C port only).
- Powerful yet Compact Portable Jump Starter: With a 4000A peak cranking power, the Gooloo GT4000S can jump-start nearly all 12V vehicle engines, including those up to 12.0L gasoline or 10.0L diesel, in just a few seconds. Unlike traditional car jump starters or jumper cable kits, it offers superior power in a more compact form. It's perfectly compatible with RVs, pickup trucks, motorcycles, SUVs, tractors, boats, and more.
- Easier & Safer to Jump-start: This portable lithium car battery jump starter pack has a 3.2-inch informative LED screen clearly to show product status , so you can know when to start the car intuitively. Built-in 10 kinds of protection technology to free your mind of misgivings of misoperation and sparks.
- 24 Months Stand-by Time: Regular charging is not necessary as long as you own the GT4000S battery jump starter. The built-in 10 protection technologies also greatly extend the service life of the product.
- More than a Battery Jump Starter: Not only a jump starter battery pack,the GOOLOO GT4000S also features as a portable battery bank with three USB Ports and a 400 lumen flashlight with 3 modes(SOS, SPOTLIGHT, STROBE).Plus a 15 volt 10 Amps port for powering any 15V or 12V DC devices, like tire inflators, inverters, and more.
- In The Box: Gooloo 4000A Portable Car jump starter battery pack GT4000S, Heavy Duty Jumper Cables, SC 100W Car Charger, USB to Type-C Cable, Type-C to Type-C Cable, Cigarette Lighter Adapter, Storage Bag, User Manual.
Brand: GOOLOO
Product Dimensions: 3.93"D x 9.05"W x 2.12"H
Amperage: 4000 Amps
Peak Output Current: 4000 Amps
Manufacturer: GOOLOO
Manufacturer: GOOLOO
Brand: GOOLOO
Item Weight: 4.38 pounds
Product Dimensions: 3.93 x 9.05 x 2.12 inches
Item model number: GT4000S
Batteries: 1 Lithium Polymer batteries required. (included)
Manufacturer Part Number: GT4000S
Amperage: 4000 Amps
Date First Available: September 20, 2022
Frequently asked questions
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Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
I bought the GT4000S because I have a Ford Excursion with the large 6.8L Ford that has sit in recent times because of surgeries. I inevitably forgot to unhook the battery and after many weeks of sitting, it runs the battery down. Most recently a door switch began acting poorly and caused the battery to drain quickly. 2 weeks post surgery and the battery read less than 3 volts on a DMM. Tried a traditional pack I have (Stanley MAXX 1000A) and it turned on the lights but never attempted to crank. The GT4000S however, was very easy to set up, with one connection to the unit and essentially two button pushes. Out of the box and to my surprise, it immediately turned over my engine and started my Excursion with little effort. Only took 3% from the batteries charge as well. The display is basic but gives pertinent information. The unit itself is ruggedly built and its features are pronounced. The USB-C connections will charge everything from a laptop to a phone with ease. It will vary the voltage based upon the need of what is being charged. For jump starting, it will not let you hook up the terminals incorrectly and will indicate to you that you have them incorrectly placed. It recharges quickly, but is limited in the USB-C to <50watts when not connected to a dedicated 100watt charger from GOOLOO, which more than doubles the 1.5 hours to over 3 hours from dead, but isn't a huge concern as I plug it in overnight after using it then place it back in my truck in the morning. Overall, I am impressed with this unit and cannot say enough about it. Its compact, comes with a charging cable (USB-C to USB-C) jumper cables, a carry case (nylon type of sack), and a hefty manual. Couple of tips, if it has trouble starting the car because the battery is drained to near zero, press the button once to put it in boost mode, and immediately start the vehicle. Invest in the hard case kit that is sold for them. Well worth it and ensures that screen is 100% protected.
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Reviewed in the United States on February 7, 2024 by merlin12volt
Necessary for any car or RV and roadtrip. Just bought this for our son leaving for college. Almost everyone in our family carries a Gooloo in their car and have for last 7 years. We even used it recently to jump our $15K RV lithium battery bank. Easy to use, reliable, you're never stranded and always have power for phone charging, etc. They retain a charge for very long periods (my experience 2 years and more without recharge) and recharge quickly. A must for any loved one to keep them safe and independent. Faster to Gooloo jump a car than jumper cables- throw the cables away and don't wait for another vehicle to help. I use before calling AAA.
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Reviewed in the United States on July 3, 2025 by Kat
Portable and it works! So far. - so good! Have only used once!👍
Reviewed in the United States on September 23, 2025 by Bob Knepper
There is a version of this device that will pre-heat the device in extremely cold weather. Make sure that's what you get if you're in very cold places! This one does NOT have the heater and being in a car overnight in the 20s or below means it needs to warm up to about 50 before it will deliver full charge. Trying to jump with it before it warms up can damage the thing or it simply won't do anything at all. But, cold weather issues aside... it's a very good performer, jumps most anything the first time without any problems, even batteries that are so dead they won't even register as a circuit when the box is hooked up (digital display does not turn on to indicate it's detected a battery). For occasional use one will be good - just charge it up once very month or two (it'll loose less than 10% a month while in storage). If you use them daily like I do you'll want two or more. While very good they are very, very sensitive to overvoltage and will drop into safe mode very, very quickly and it takes upwards of 10 minutes before it'll reset itself. And they discharge relatively swiftly... 7 'dead' cars or 10 'weak' cars, at most, before they're below 20% charge where it'll begin to struggle. Type-C charger means it'll recharge *FAST* - about 90 minutes from 0 to 100% at a wall outlet with a decent outlet charger (20v min). 2+hrs with a standard car utility outlet (5v).
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Reviewed in the United States on December 27, 2023 by Wolfking
This product is excellent . I liked it so much that I purchased a second … and am considering another as a gift if I find a discount ! Compared to the old lead acid type , this thing is light years ahead . More amps , smaller , less weight , more starts per charge and fool proof . There’s no way to short this thing out . My only 2 complaints : 1) ditch the storage bag and include an actual case like other competitors do . The bag is terrible . And 2) include the ac to dc usb wall charging block ! I’d be fine with paying another 10 to 15 dollars if these items were included . Still all in all , a very good product .
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Reviewed in the United States on December 1, 2022 by Fire