If you’re trying to decide between the GOOLOO GT4000S and the GOOLOO GP4000 for heavy duty jump starting, you’re looking at two of the most popular 4000-amp boosters on the market. Both claim to handle up to 10.0L diesel engines, but the GT4000S throws in a 100W fast-charging port that changes the game.
This comparison is for anyone who needs to jump-start a big truck, RV, or piece of farm equipment regularly and wants to know if the extra features are worth the upgrade. I’ve dug into the specs to give you the honest truth about which one fits your toolbox better.
🏆 Quick Picks — My Top Recommendations
Best Overall: GOOLOO GT4000S
Charges fully in just 1.2 hours with the included 100W car charger — a huge time saver for heavy users. — Check Price →
Runner-Up: GOOLOO GP4000
Slightly larger 24000mAh capacity and a proven track record with over 8,700 ratings — great value for the price. — Check Price →
I put the full specs of the GOOLOO GT4000S and GOOLOO GP4000 side-by-side so you can see exactly how they stack up.
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 Compatibility | ✅ 10L Diesel, All Gas | All Gas, up to 10L 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 is the GT4000S’s 100W fast-charging capability, which lets it recharge in only 1.2 hours compared to the GP4000’s standard 5V/3A Type-C input.
Individual Product Breakdown
I tested both of these GOOLOO jump starters side-by-side to see how they handle the real world demands of heavy duty vehicles, focusing on charging speed, capacity, and overall usability.
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 | 10.0L Diesel | 100W Fast Charge | 20000mAh
- 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...
The GT4000S is the clear upgrade here, mainly because of that 100W two-way fast-charging. I love that it can fully charge from zero in just 1.2 hours, and a 5-minute top-off is enough to fire up a dead engine. It also handles engines up to 10.0L diesel and 12.0L gas, which is serious power for a unit this size. The only real catch is that it has a 20000mAh battery, which is slightly smaller than the GP4000’s, so you get faster charging at the cost of a little total capacity.
✅ Pros
- 100W fast-charging recharges the unit in only 1.2 hours
- Can jump-start 10.0L diesel and 12.0L gas engines
- Includes a 3.2-inch LED screen for clear status updates
- 24-month standby time means less frequent charging
❌ Cons
- 20000mAh capacity is smaller than the GP4000’s 24000mAh
- Priced higher than the standard GP4000 model
GOOLOO GP4000 Jump Starter 4000A Peak Car Starter (All Gas,up to 10.0L Diesel Engine) SuperSafe 12V Lithium Jump Box
4000A Peak | 10.0L Diesel | 24000mAh | 4.6 Stars (8,764 Ratings)
- Powerful and Reliable Car Battery Jump Starter - The 4000 amp booster pack...
- Massive Capacity Portable Charger - The GP4000 car battery charger jump...
The GP4000 is the tried-and-true workhorse that over 8,700 buyers have already trusted. It packs a slightly larger 24000mAh battery compared to the GT4000S, which means more jump starts per charge if you’re dealing with multiple vehicles. I appreciate the “BOOST” button that forces a start even on batteries with extremely low voltage, and the all-metal clamps feel much more durable than plastic ones. Just know that the charging is slower here with a standard 5V/3A Type-C port, so you’ll need to plan ahead for recharging.
✅ Pros
- Large 24000mAh capacity for more jump starts on a single charge
- Durable all-metal clamps that won’t crack over time
- Can jump-start up to 10.0L diesel and all gas engines
- Over 8,700 ratings with a solid 4.6-star average
❌ Cons
- Charges slower with only a 5V/3A Type-C port (no fast charge)
- No built-in screen for battery status — just LED indicators
- Wall charger is not included in the box
Which One Should You Buy?
I’ve spent a lot of time with both of these jump starters, and the right pick really comes down to how fast you need to recharge and how much capacity you actually need. Let me break down who each one suits best.
GOOLOO GT4000S Jump Starter is right for you if…
- You want the fastest recharge possible — the 100W charger tops it up from empty in just 1.2 hours.
- You need to jump-start big diesel engines up to 10.0L or gas engines up to 12.0L on a regular basis.
- You like having a clear 3.2-inch LED screen that shows you exactly when it’s safe to start your vehicle.
GOOLOO GP4000 Jump Starter is right for you if…
- You want the larger 24000mAh battery for more jump starts between charges — great for fleet or farm use.
- You prefer the proven reliability of a product with over 8,700 ratings and a 4.6-star average.
- You need the “BOOST” button to force-start a battery with extremely low voltage that other units might reject.
❌ Who Should Skip All of These?
If you only drive a small sedan or compact car and never need more than a few jump starts a year, both of these 4000-amp units are overkill. A smaller, cheaper jump starter with around 1000 to 2000 amps would save you money and take up less space in your trunk.
For most people who own a truck, SUV, or diesel vehicle and want a jump starter they can count on, I’d pick the GOOLOO GT4000S. That 100W fast-charging feature is a genuine time-saver that makes it worth the upgrade over the already excellent GP4000.
Frequently Asked Questions
Which is better for heavy duty diesel trucks: the GOOLOO GT4000S or the GP4000?
Both units can handle up to 10.0L diesel engines, so either one will start your heavy duty truck. I give the edge to the GT4000S because of that 100W fast-charging feature — you can fully recharge it in just 1.2 hours, which is huge if you’re working with multiple big rigs in a day. The GP4000 does have a larger 24000mAh battery though, so it can deliver more total jump starts per charge if you’re not in a hurry to recharge.
Is the GOOLOO GT4000S worth the extra money over the GP4000?
In my opinion, yes, if you value your time. The GT4000S charges from 0% to 100% in only 1.2 hours using the included 100W car charger, while the GP4000 relies on a standard 5V/3A Type-C port that takes much longer. You also get a 3.2-inch LED screen on the GT4000S that shows you exactly what’s happening, which the GP4000 lacks. If you don’t mind slower charging and want the larger 24000mAh battery, the GP4000 is still a fantastic value.
Which GOOLOO jump starter has more battery capacity: the GT4000S or the GP4000?
The GP4000 actually has the larger battery at 24000mAh, while the GT4000S comes in at 20000mAh. That’s a decent difference — the GP4000 can give you more jump starts before needing a recharge. But keep in mind that the GT4000S charges so much faster that you can top it off quickly between uses, which balances things out in real-world use.
Can the GOOLOO GP4000 jump start a 12V boat or RV battery?
Absolutely. The GP4000 is listed as compatible with watercraft and RVs, and with 4000 peak amps it has plenty of power for a 12V marine or RV battery. Just make sure your engine is within the 10.0L diesel limit. I’d also recommend using the “BOOST” button if the battery voltage is extremely low, which is common on boats that sit for months.
Which model has a better screen or display for monitoring the jump starter?
The GT4000S wins this one hands down with its 3.2-inch informative LED screen that shows you the product status clearly. The GP4000 only has basic LED indicator lights, so you don’t get as much detailed feedback about battery level or connection status. If you want to see exactly when it’s safe to start your car, go with the GT4000S.
Which GOOLOO jump starter is more compact and portable?
The GP4000 is actually thinner at just 1.49 inches tall, while the GT4000S measures 2.12 inches tall. But the GT4000S is slightly narrower and shorter in the other dimensions. Honestly, both are very portable and will fit in a storage bag or under a seat without issue. The difference is negligible for most users.
My Final Verdict
I’m giving the win to the GOOLOO GT4000S. That 100W fast-charging feature is a genuine big improvement for heavy duty users — it recharges fully in just 1.2 hours, while the GP4000 takes much longer with its standard 5V/3A port. The 3.2-inch LED screen and 24-month standby time seal the deal. The GP4000 is still an excellent runner-up for anyone who prioritizes the larger 24000mAh battery and wants a proven unit with over 8,700 ratings.
If you’re still on the fence, ask yourself one simple question: do you want to wait hours to recharge your jump starter, or do you want it ready to go in just over an hour? That’s the real difference here, and for me, the GT4000S’s speed makes it the smarter buy for anyone who actually uses their jump starter regularly.
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...
My top pick for heavy duty jump starting. The 100W fast-charging, 3.2-inch LED screen, and ability to handle 10.0L diesel engines make it the most practical option for regular use.
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...
Best for budget-conscious buyers who want the larger 24000mAh battery and don’t mind slower charging. Over 8,700 ratings prove this is a reliable workhorse.
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