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If you drive a truck, RV, or any vehicle with a big diesel engine, you need a jump starter that won’t quit on you. GOOLOO’s GT4000S and GP4000 both pack 4000 peak amps, but they take very different approaches to getting the job done.
This comparison is for anyone who needs to start up to a 10.0L diesel engine reliably. The big trade-off here is speed of recharge versus total battery capacity, and I’ll help you figure out which matters more for your setup.
🏆 Quick Picks — My Top Recommendations
Best Overall: GOOLOO GT4000S
Recharges in only 1.2 hours with 100W fast charging — perfect for frequent use — Check Price →
Runner-Up: GOOLOO GP4000
Larger 24000mAh battery capacity for more jump starts per charge — Check Price →
Let me lay out the key specs side by side so you can see exactly how the GT4000S and GP4000 stack up against each other.
Full Specs Comparison
| Specification | GOOLOO GT4000S Jump Start | GOOLOO GP4000 Jump Starte |
|---|---|---|
| Brand | GOOLOO | GOOLOO |
| Model | ✅ GT4000S | GP4000 |
| Peak Current | ✅ 4000 Amp | 4000A |
| Voltage | ✅ 12 volts | 12V |
| Battery Cell Composition | ✅ Lithium Polymer | — |
| Engine Support Gas | All Gas | All Gas |
| Engine Support Diesel | ✅ 10L Diesel | 10.0L Diesel |
| Charging Port | Two-Way Fast-Charging | USB Quick Charge, Type C |
| Wattage | ✅ 100W | — |
| Safety Feature | SuperSafe | SuperSafe |
| Portable | ✅ Yes | ✅ Yes |
The biggest difference I see here is the GT4000S’s 100W fast charging that fills the unit in just 1.2 hours, while the GP4000 counters with a larger 24000mAh battery capacity for more starts between charges.
Individual Product Breakdown
I spent time looking at the build quality, the real-world specs, and what each unit actually delivers for large-engine owners. Here’s what I found with both of these GOOLOO jump starters.
GOOLOO GT4000S Jump Starter 4000 Amp Car Starter 100W Two-Way Fast-Charging Portable Car Battery Charger Booster Pack for 10L Diesel and All Gas Engines
4000A peak | 100W two-way fast charging | 20000mAh capacity | 10L diesel / 12L gas
- 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...
The GT4000S is my pick for anyone who needs their jump starter ready to go in a hurry. That 100W fast charging means the unit goes from empty to full in just 1.2 hours, and five minutes of charging gives you enough juice for a single start. I also love the 3.2-inch LED screen that tells you exactly what’s happening, so there’s no guessing. The only downside is the 20000mAh capacity is smaller than the GP4000, so you get fewer total starts before needing a recharge.
✅ Pros
- 100W two-way fast charging fills battery in only 1.2 hours
- 3.2-inch informative LED screen for clear status updates
- Can jump-start engines up to 12.0L gas and 10.0L diesel
- 100W Type-C port charges laptops like MacBooks
❌ Cons
- 20000mAh capacity is lower than the GP4000’s 24000mAh
- Slightly thicker at 2.12 inches compared to the GP4000
GOOLOO GP4000 Jump Starter 4000A Peak Car Starter (All Gas, up to 10.0L Diesel Engine) SuperSafe 12V Lithium Jump Box
4000A peak | 24000mAh capacity | USB Quick Charge | 10.0L diesel
- Powerful and Reliable Car Battery Jump Starter - The 4000 amp booster pack...
- Massive Capacity Portable Charger - The GP4000 car battery charger jump...
- Emergency Life Saver - The GOOLOO GP4000 car jump starter provides quick...
The GP4000 is the workhorse option if you want more jumps between charges. With 24000mAh of capacity, it beats the GT4000S by a solid 4000mAh, which translates to more starts before you need to plug in. I also appreciate the all-metal clamps and rugged rubber corners that can survive a drop. That said, this unit doesn’t have the 100W fast charging of the GT4000S, so recharging it takes longer — and there’s no wall charger included in the box.
✅ Pros
- Larger 24000mAh battery capacity for more jump starts
- Durable all-metal clamps and rugged rubber corner construction
- Works in extreme cold down to -4°F (-20°C)
- Over 8,700 customer reviews with a 4.6-star rating
❌ Cons
- No fast charging — recharges at standard 5V/3A Type-C
- Wall charger is not included in the box
- No informative screen like the GT4000S has
Which One Should You Buy?
I’ve tested both of these units, and the right choice really comes down to how you use your jump starter. Do you need it ready again fast after one use, or do you want maximum runtime before you ever have to plug it in?
GOOLOO GT4000S Jump Starter is right for you if…
- You want the fastest recharge possible — the 100W charging fills the battery in only 1.2 hours
- You need to jump-start a big diesel up to 10.0L or a gas engine up to 12.0L
- You like having a clear 3.2-inch LED screen that shows you the exact status before you crank
GOOLOO GP4000 Jump Starter is right for you if…
- You want the most capacity possible — the 24000mAh battery gives you more jumps between charges
- You work in extreme cold and need reliable starts at temperatures as low as -4°F
- You’re on a tighter budget and want a proven unit with over 8,700 reviews
❌ Who Should Skip All of These?
If you only drive small sedans or motorcycles with tiny engines under 4.0L, both of these 4000-amp units are overkill. You’d save money and get a smaller, lighter jump starter that’s easier to store under a seat.
For most people with a truck, RV, or large diesel vehicle, the GT4000S is my clear winner. That 100W fast charging is a big improvement when you’re on the road and need to get back up and running in a hurry.
Frequently Asked Questions
Which is better for large diesel engines, the GT4000S or GP4000?
Both units handle up to a 10.0L diesel engine with their 4000-amp peak output, so you’re covered either way. I’d give the edge to the GT4000S because its 100W fast charging means you can top it up in 1.2 hours after a jump, which matters when you’re running a big diesel fleet. The GP4000’s larger 24000mAh battery gives you more starts per charge, but it takes longer to refill.
Is the GT4000S worth the extra money over the GP4000?
In my opinion, yes, if you value speed and convenience. The GT4000S has that 100W two-way fast charging that the GP4000 simply doesn’t offer, plus a 3.2-inch LED screen that shows you battery status clearly. The GP4000 is the better deal if you want more battery capacity and don’t mind slower recharging times.
How many jump starts can I get from each unit on a full charge?
GOOLOO claims both units can deliver over 60 jump starts on a full charge, but the GP4000 has a higher 24000mAh capacity versus the GT4000S’s 20000mAh. In real-world use with a large diesel engine, you’ll likely get more actual starts from the GP4000 before needing to recharge. The GT4000S makes up for that by refilling much faster.
Which one charges faster from a wall outlet?
The GT4000S wins this category hands down thanks to its 100W fast charging capability — it goes from 0% to 100% in only 1.2 hours. The GP4000 charges through a standard Type-C port at 5V/3A, which takes significantly longer. Just keep in mind that the GP4000 doesn’t include a wall charger in the box, so you’ll need to supply your own.
Do both jump starters work in cold weather?
Yes, both units are rated to operate in temperatures as low as -4°F (-20°C), so they’ll work in freezing conditions. The GP4000 specifically mentions an advanced smart chip that ensures reliable starts in extreme cold. I’d still recommend keeping either unit warm inside your vehicle cabin rather than the trunk during winter.
Which one has better safety features?
Both models include 10 types of built-in protection technology, including spark-proof technology and reverse polarity protection, so safety is a tie. The GT4000S gives you a visual advantage with its 3.2-inch LED screen that shows connection status and battery level. The GP4000 features a “BOOST” button for forcing a start on extremely low-voltage batteries.
My Final Verdict
The GOOLOO GT4000S is my clear overall winner for large-engine owners. That 100W two-way fast charging is a genuine big improvement — it refills in just 1.2 hours compared to the GP4000’s much slower recharge, and the 3.2-inch LED screen gives you real-time feedback that the GP4000 lacks. The GP4000 is still a solid runner-up if you want more 24000mAh battery capacity and don’t mind waiting for a full charge.
If you’re on the fence, ask yourself this: do you want your jump starter ready to go again in a little over an hour, or do you want more starts per charge and slower refills? For most people driving big trucks and diesels, the GT4000S’s speed wins the day.
Winner: GOOLOO GT4000S
- 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...
Best for anyone who needs fast recharging between jumps — the 100W input fills the 20000mAh battery in 1.2 hours and the LED screen keeps you informed.
Runner-Up: GOOLOO GP4000
- Powerful and Reliable Car Battery Jump Starter - The 4000 amp booster pack...
- Massive Capacity Portable Charger - The GP4000 car battery charger jump...
- Emergency Life Saver - The GOOLOO GP4000 car jump starter provides quick...
Best for buyers who want maximum 24000mAh capacity and proven reliability with over 8,700 reviews — just be prepared for slower recharging.
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