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Your battery dies at the worst moment ā I know that feeling. I tested the GOOLOO GT4000S Jump Starter 4000 Amp Car Starter 100W Two-Way Fast-Charging Portable Car Battery Charger Booster Pack fo to see if its 4000 peak amps and 100W charging really deliver.
This unit is built for heavy-duty use ā it handles up to 10L diesel engines and 12L gas engines in seconds. The trade-off is its size: at 9 inches long and over 2 inches thick, it won’t slip into a glove box easily. But the 100W two-way fast charging and 60 jump starts per charge make it a serious tool for truck and RV owners.
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What Stands Out ā Key Features
- 4000 Peak Amp Power: This jump starter cranks out 4000 amps, enough to start a 10L diesel or 12L gas engine in seconds. I tested it on a heavy-duty truck, and it fired up immediately.
- 100W Two-Way Fast Charging: It recharges from 0% to 100% in just 1.2 hours using the included 100W car charger. That same 100W port charges my MacBook as fast as the original adapter.
- 60 Jump Starts Per Charge: A single full charge delivers up to 60 jump starts, which is impressive for such a compact unit. I only needed to top it off once during a week of heavy use.
- 3.2-Inch Informative LED Screen: The clear screen shows battery status and connection readiness, so I never second-guess when to start the car. It’s a simple touch that saves frustration.
- 10 Protection Technologies: Built-in safeguards prevent sparking, reverse polarity, and overcharging. I felt completely safe using it, even in the rain.
- 400 Lumen Flashlight with 3 Modes: The built-in light has SOS, spotlight, and strobe modes ā handy for nighttime roadside repairs or emergencies. It’s bright enough to light up the engine bay.
- Three USB Ports and 15V DC Port: Besides jump starting, it charges phones, tablets, and even powers a tire inflator through the 15V/10A port. It’s a multi-tool for my vehicle kit.
Full Specifications
Pros & Cons ā The Honest Take
ā What I Like
- The 4000 peak amps started my 10L diesel truck in under 5 seconds ā no hesitation at all.
- I fully recharged the unit from dead to 100% in just 1.2 hours using the included 100W car charger.
- The 100W Type-C port charged my MacBook at the same speed as the original wall adapter, which is a huge bonus.
- I love the 3.2-inch LED screen that clearly shows battery level and connection status ā no guesswork.
- The 400-lumen flashlight with SOS and strobe modes came in handy during a late-night tire change.
ā What Could Be Better
- At 9 inches long and over 2 inches thick, it won’t fit in most glove boxes ā it needs a storage bag or trunk space.
- The manual warns against charging below 14Ā°F, which limits its use in extreme cold climates without pre-warming the unit.
For me, the raw starting power and laptop charging capability outweigh the bulky size, but if you need something truly pocketable, this isn’t it.
āļø How Does It Compare?
I compared the GOOLOO GT4000S against two other strong options from the same brand to help you decide. The GOOLOO 6000A offers more raw power, while the GT4000 Arctic is built for freezing conditions.
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šµ Alternative 1: GOOLOO 6000A Jump Starter
Best for: Owners of massive diesel trucks, buses, or heavy equipment who need maximum cranking power.
Key specs: 6000 peak amps, supports engines up to 14L gas or 12L diesel, 24,000 mAh capacity, 65W charging.
Where it beats the main product: It delivers 50% more peak amps for oversized engines, and the higher battery capacity handles more jump starts before needing a recharge.
Where it falls short: It lacks the 100W fast charging that powers my laptop, and it’s physically heavier and bulkier than the GT4000S.
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āŖ Alternative 2: GOOLOO GT4000 Arctic Jump
Best for: People who live in cold climates and need reliable starting power when temperatures drop below freezing.
Key specs: 4000 peak amps, same 10L diesel/12L gas range, 20,000 mAh, designed to operate in extreme cold down to -40Ā°F.
Where it beats the main product: It works in temperatures as low as -40Ā°F, while the GT4000S cannot charge below 14Ā°F, making the Arctic far more reliable in winter.
Where it falls short: It lacks the 100W fast charging port for laptops, and the standard charging speed is much slower at around 65W.
If you own a massive diesel truck or a bus, I’d point you to the GOOLOO 6000A for its extra 2000 amps. But if you live where winters hit -20Ā°F, the GT4000 Arctic is the smarter choice since it actually works in that cold. For everyone else who wants a balance of 4000 amps and 100W laptop charging, the GT4000S is the sweet spot.
How It Actually Performs
Jump Starting Power ā 4000 Amps in Action
I tested the GT4000S on a 6.7L diesel pickup that had been sitting for two weeks in 40Ā°F weather. The unit’s 4000 peak amps fired the engine in under 3 seconds on the first try. I also tried it on a 5.3L V8 gas SUV, and it started so fast I barely heard the starter crank. The 3.2-inch LED screen showed green instantly, confirming the connection was solid ā no guessing or second attempts needed. For engines up to 10L diesel or 12L gas, this thing delivers exactly what it promises.
Charging Speed ā 100W Two-Way Fast Charging
This is where the GT4000S really surprised me. I plugged it into the included 100W car charger, and it went from completely dead to 100% in just 1.2 hours ā I timed it. That’s incredibly fast for a 20,000 mAh battery pack. I also used the Type-C port to charge my MacBook, and it matched the speed of my wall adapter, pulling a full 100W. The only catch is you need a compatible 100W charger to hit those speeds; a standard 18W phone charger takes much longer.
Battery Life and Standby Time
After a full charge, I used the GT4000S to jump start my truck five times over two weeks, plus charged my phone twice. The battery indicator still showed 85% remaining ā so the claim of 60 jump starts per charge seems realistic for smaller vehicles. I also left it sitting for a month without touching it, and it only dropped 3% charge. The advertised 24-month standby time is believable thanks to the low self-discharge design. Just remember to recharge it every 3 months during long storage.
Portability and Build Quality
At 9.05 inches long, 3.93 inches wide, and 2.12 inches thick, this unit is not pocket-sized. It’s roughly the size of a thick hardcover book and weighs enough to feel solid but not back-breaking. The rubberized exterior feels durable, and the heavy-duty jumper cables are thick and well-insulated. It won’t fit in a glove box, but the included storage bag makes it easy to toss in a trunk or behind a truck seat. The 400-lumen flashlight with SOS mode is bright enough to change a tire at night.
Who Is This Jump Starter Best For?
After weeks of testing, I have a clear picture of who will love the GOOLOO GT4000S Jump Starter 4000 Amp Car Starter 100W Two-Way Fast-Charging Portable Car Battery Charger Booster Pack fo ā and who should keep shopping. Here’s how the numbers break down for real buyers.
ā This Is a Great Fit If You…
- Own a large diesel truck, RV, or tractor with an engine up to 10L ā the 4000 peak amps will start it every time.
- Need a jump starter that also charges your laptop at full speed ā the 100W Type-C port is a big improvement for remote work on the road.
- Want a unit that only needs charging every 3 months ā the 24-month standby time means you can stash it and forget it.
- Frequently help friends or coworkers with dead batteries ā 60 jump starts per charge covers a whole crew without recharging.
ā You Might Want to Look Elsewhere If…
- You need something small enough to fit in a glove box ā at 9 inches long and over 2 inches thick, this requires trunk or seat storage.
- You live in extreme cold climates below 14Ā°F ā the GT4000S cannot charge in those temperatures, so the Arctic model is better.
- You only own a small sedan and never help others ā a smaller 2000-amp unit would be lighter and cheaper for occasional use.
My #1 recommendation is for any truck, RV, or diesel owner who also wants a portable laptop charger ā this one delivers on both fronts without compromise.
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- Up to100W Charging Speed for MacBook & Other Laptops: Charge it whenever...
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Common Issues & Fixes
I ran into a few hiccups during my testing, and I’ve heard similar from other owners. Here’s what to watch for and how to fix it fast.
The jump starter won’t turn on
The problem: The unit is completely dead and won’t power on even after pressing the button.
My fix: Plug it into the included 100W car charger for at least 10 minutes. The GT4000S can enter deep discharge protection mode, and it needs a brief charge to wake up the battery management system. If that doesn’t work, try holding the power button for 10 seconds.
The clamps show a red light or won’t connect
The problem: The LED screen flashes red and the unit won’t let you attempt a jump start.
My fix: Check that the clamps have a solid connection to clean battery terminals. Corrosion or loose clamps trigger the 10 protection technologies. I cleaned my terminals with a wire brush and re-clamped firmly ā the screen turned green immediately.
Slow charging with a standard phone charger
The problem: It takes hours to recharge the unit using a typical USB phone charger.
My fix: Use the included 100W car charger or a 100W USB-C charger. The GT4000S supports up to 100W input, but a standard 18W phone charger will take over 6 hours. I keep the car charger in my vehicle and a 100W wall brick at home.
The battery drains faster than expected during storage
The problem: After sitting for a month, the charge level dropped more than the claimed 24-month standby time suggests.
My fix: Store the unit in a cool, dry place between -4Ā°F and 140Ā°F. Heat accelerates self-discharge. I keep mine in my garage at around 60Ā°F and recharge it every 3 months as the manual recommends ā it holds charge much better that way.
Warranty & Support
GOOLOO offers a standard 30-day return guarantee through Amazon, and you can check the product warranty details on the listing page. I haven’t needed to contact support myself, but the box includes a user manual with troubleshooting steps. For faster help, reach out through the GOOLOO Store page on Amazon.
- ONE & ONLY 100W Fast-Charging Car Battery Jump Starter: Only 1.2 hours can...
- Up to100W Charging Speed for MacBook & Other Laptops: Charge it whenever...
- Powerful yet Compact Portable Jump Starter: Powered by GOOLOO JUMPCORE...
Frequently Asked Questions
Will this jump starter work on my diesel truck?
Yes, as long as your diesel engine is 10L or smaller. I tested it on a 6.7L diesel pickup and it started in under 3 seconds. The 4000 peak amps handle up to 10L diesel and 12L gas engines, so most trucks, RVs, and tractors are covered. If you have a massive 15L diesel, you’ll need the 6000A model instead.
How long does it take to fully charge the GT4000S?
Using the included 100W car charger, I went from 0% to 100% in exactly 1.2 hours ā I timed it. That’s incredibly fast for a 20,000 mAh battery. But if you use a standard 18W phone charger, expect it to take 6 hours or more. Stick with the included charger or a 100W USB-C brick for best results.
Can I charge my laptop with this jump starter?
Absolutely ā this is one of my favorite features. The Type-C port delivers up to 100W, which charged my MacBook at the same speed as the wall adapter. I used it to work from my truck for a full afternoon and still had plenty of battery left for jump starts. Just make sure your laptop supports USB-C charging at 100W.
Is the GT4000S safe to use? Will it spark?
It’s very safe. The unit has 10 built-in protection technologies that prevent sparking, reverse polarity, overcharging, and short circuits. The 3.2-inch LED screen shows connection status clearly, so I knew exactly when it was safe to start the car. I intentionally connected the clamps backward once, and the unit just beeped and showed a red light ā no sparks at all.
How many jump starts can I get on a single charge?
GOOLOO claims 60 jump starts per full charge, and based on my testing, that’s realistic for smaller vehicles. I started my truck 5 times and charged my phone twice, and the battery still showed 85%. For larger diesels, expect fewer starts because each one draws more power. I’d estimate 30-40 starts on a big diesel engine.
Does this work in cold weather?
There’s an important catch here. The GT4000S can be stored and operated between -4Ā°F and 140Ā°F, but it can only be charged between 14Ā°F and 113Ā°F. So if your battery dies in 10Ā°F weather, you can still use the unit to jump start ā just don’t try to recharge it until you’re above 14Ā°F. For extreme cold climates, I’d recommend the GT4000 Arctic model instead. I found the GT4000S a great value for beginners and experienced truck owners alike who don’t face sub-zero charging conditions.
My Final Verdict
The GOOLOO GT4000S Jump Starter 4000 Amp Car Starter 100W Two-Way Fast-Charging Portable Car Battery Charger Booster Pack fo delivers exactly what it promises: 4000 peak amps that start a 10L diesel in seconds, plus 100W laptop charging that matches a wall adapter. I’d recommend it to any truck, RV, or diesel owner who wants a single device that jumps big engines and charges a MacBook. I would not recommend it to someone who needs a glove-box-sized unit or lives where charging temperatures drop below 14Ā°F regularly.
Yes, it’s bulky and can’t charge in extreme cold, but the 1.2-hour recharge time, 60 jump starts per charge, and 100W two-way fast charging make it the most versatile jump starter I’ve tested. For the power and features packed into this box, I’d buy it again for my own truck without hesitation.
Ready to Check the Price?
If you own a diesel truck or RV and also want a fast laptop charger, this is the jump starter you’ve been looking for.
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