NOCO GBX45 vs Gooloo GT4000S: Which Is the Better Buy?
The Gooloo GT4000S wins on raw power, battery capacity, and overall value. It handles engines up to 12.0L gas and 10.0L diesel, and delivers up to 60 jump starts per charge. The NOCO GBX45 is the better pick if you drive a small car or sedan and want an ultra-compact, ultralight jump starter with a premium brand name and Manual Override for deeply dead batteries.
You’ve got a dead battery. You need a jump starter. And now you’re staring at two options that look almost identical at first glance. I’m Alex Rahman, and I’ve spent years reviewing automotive tools and portable power products. Both the NOCO GBX45 and the Gooloo GT4000S are strong jump starters — but they’re built for very different drivers. One is slim, light, and made for everyday cars. The other is a powerhouse that can handle diesel trucks and deliver 60 starts before it needs a recharge. Let’s break it all down so you know exactly which one to buy.
- The Gooloo GT4000S is the overall winner — more power, more capacity, and more starts per charge.
- The NOCO GBX45 wins on portability — it weighs just 2.16 lbs and fits in a glovebox easily.
- Only the GBX45 has Manual Override for batteries below 2V — a critical edge in emergencies.
- The GT4000S handles up to 12.0L gas and 10.0L diesel; the GBX45 tops out at 6.5L gas and 4.0L diesel.
- The GT4000S delivers up to 60 jump starts per charge; the GBX45 delivers just 6.
| Category | NOCO GBX45 | Gooloo GT4000S |
|---|---|---|
| Overall Winner | — | 🏆 |
| Best Value | ❌ | ✅ |
| Best Performance | ❌ | ✅ |
| Best For Beginners | ✅ | ✅ |
| Best for Cold Weather / Diesel | ❌ | ✅ |
Product Overview: NOCO Boost X GBX45
| ✅ Best for | Commuters and everyday drivers with cars, SUVs, or small trucks up to 6.5L gas who want a premium, ultralight jump starter |
| ❌ Not ideal for | Diesel truck drivers or anyone with a large engine over 6.5L — the NOCO GBX75 is a better fit for those needs |
| 💰 Price | ~$124.95 (check for latest price) |
The NOCO GBX45 is a compact 12V lithium jump starter rated at 1,250 amps. It starts gas engines up to 6.5L and diesel engines up to 4.0L. That covers most cars, motorcycles, ATVs, boats, and small trucks.
It uses NOCO’s PX Lithium Technology with UltraSafe 2.0 — a spark-proof, reverse-polarity system that makes it nearly impossible to connect the clamps wrong. Even if you’ve never used a jump starter before, the GBX45 is hard to mess up.
What makes it stand out is speed. It charges fully in 48 minutes via 60W USB-C. Or charge it for just 5 minutes and it’s ready to start your car. That’s genuinely impressive for a unit this size. It also doubles as a power bank — 60W out means it can charge a laptop.
At 2.16 lbs and about the size of a thick wallet, it’s one of the most portable jump starters on the market. It fits in a glovebox without any struggle. The 100-lumen flashlight with 7 modes — including SOS and emergency strobe — adds serious real-world utility.
NOCO Boost X GBX45: 1250A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack, Portable Jump Box, Power Bank & Jumper Cables – for 6.5L Gas and 4.0L Diesel Engines
The ideal pick for everyday drivers who want an ultralight, ultra-fast jump starter from a trusted brand — best for cars, sedans, and small SUVs.
Product Overview: Gooloo GT4000S
| ✅ Best for | Truck owners, RV drivers, diesel vehicle owners, and fleet managers who need maximum power and many starts per charge |
| ❌ Not ideal for | Drivers with batteries that are deeply dead (below 2V) — the GT4000S has no Manual Override; the NOCO GBX45 handles those cases |
| 💰 Price | ~$99.99 (check for latest price) |
The Gooloo GT4000S is built for drivers who need serious power. It delivers 4,000 peak amps and a massive 88.8 Wh battery — that’s nearly 3x the capacity of the GBX45. It handles engines up to 12.0L gas and 10.0L diesel. That covers full-size pickup trucks, RVs, boats, and most commercial vehicles.
What really sets it apart is the 3.2-inch LED status screen. It tells you the exact charge level, connection status, and any errors. You see “READY” on screen when it’s safe to start. No guessing. No light-counting. One Amazon user I came across said they jumped a 2024 Nissan Titan 5.6L V8 on the very first try — and the screen made it easy to know when to go.
The 100W two-way fast charge is another big win. It charges itself from 0% to 100% in 1.2 hours. It also charges your MacBook at full speed via USB-C. There’s also an 18W USB-A quick charge port and a 15V/10A DC output to power tire inflators directly — something the GBX45 can’t do.
Up to 60 jump starts on a single charge is the headline feature for fleet users. You won’t need to recharge it after every job. It also claims a 24-month standby time, meaning you can store it for two years and still expect it to work.
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, SuperSafe Lithium Jump Box for 12V Vehicles
The best pick for truck owners, diesel drivers, and fleet users who need maximum power and up to 60 starts before recharging.
Full Spec Comparison: NOCO GBX45 vs Gooloo GT4000S
| Spec | NOCO GBX45 | Gooloo GT4000S | Winner |
|---|---|---|---|
| Peak Current | 1,250A | 4,000A | GT4000S |
| Gas Engine Capacity | Up to 6.5L | Up to 12.0L | GT4000S |
| Diesel Engine Capacity | Up to 4.0L | Up to 10.0L | GT4000S |
| Battery Capacity (Wh) | 31 Wh | 88.8 Wh | GT4000S |
| Battery Capacity (mAh) | ~8,600 mAh | 24,000 mAh | GT4000S |
| Weight (unit + clamps) | 2.16 lbs (0.98 kg) | ~4.4 lbs (2 kg) | GBX45 |
| Jump Starts Per Charge | Up to 6 | Up to 60 | GT4000S |
| LED Flashlight Lumens | 100 lumens / 7 modes | 400 lumens / 3 modes | Tie |
| Built-in Status Screen | No (LED charge indicators only) | Yes — 3.2″ LED screen | GT4000S |
| Manual Override | Yes | No | GBX45 |
| IP Rating | IP65 | IP65 | Tie |
| Charging Speed (Max) | 60W USB-C | 100W USB-C | GT4000S |
| Full Recharge Time | 48 minutes | ~72 minutes (1.2 hours) | GBX45 |
| 0% to Jump-Ready | 5 minutes | 5 minutes | Tie |
| Operating Temp Range | -4°F to 122°F | -4°F to 140°F | GT4000S |
| 15V/10A DC Output | No | Yes | GT4000S |
| Standby Time | Not specified | Up to 24 months | GT4000S |
| Price (Amazon) | ~$124.95 | ~$99.99 | GT4000S |
| Warranty | 1-Year Limited | Customer service-based | GBX45 |
Raw Power and Performance: NOCO GBX45 vs Gooloo GT4000S
The Gooloo GT4000S wins this category — and it’s not close. At 4,000 peak amps, it delivers more than 3x the cranking power of the GBX45’s 1,250 amps. That gap matters in the real world.
The GBX45 handles most everyday vehicles confidently. Cars, motorcycles, boats, and trucks with engines up to 6.5L gas or 4.0L diesel start without issue. That covers a huge percentage of passenger vehicles on the road today. Think Honda Civics, Toyota Camrys, Ford Escapes, and Jeep Wranglers.
Here’s where the GT4000S separates itself. A Ford F-250 diesel runs a 6.7L turbodiesel. A Ram 2500 Cummins runs a 6.7L. A Chevy Silverado 2500 HD with a Duramax runs a 6.6L diesel. None of those are within the GBX45’s 4.0L diesel limit. The GT4000S handles all of them — and then some, up to 10.0L diesel and 12.0L gas.
The 88.8 Wh battery in the GT4000S (vs 31 Wh in the GBX45) also means up to 60 jump starts vs just 6. For a fleet manager or a mechanic who needs to start multiple vehicles, the GBX45 runs out quickly. The GT4000S keeps going.
For everyday cars and small trucks — the GBX45 is plenty. For large trucks, RVs, and diesel engines — only the GT4000S has the power to get the job done. Winner: Gooloo GT4000S.
Size, Portability, and Design: Which One Is Easier to Carry?
The NOCO GBX45 wins this category easily. It weighs just 2.16 lbs with clamps attached. It measures 6.83″ × 3.28″ × 2.08″ — about the size of a fat paperback book. It slides into a glovebox without force.
The GT4000S weighs around 4.4 lbs (2 kg) with its accessories. It’s still portable and compact enough to keep in a truck cab, but it won’t disappear into a small compartment. If you drive a compact car with limited storage, the GBX45 is the more practical choice.
Design-wise, NOCO has always prioritized refinement. The GBX45 looks sleek and professional. Its cable management is integrated, and the overall feel is premium. The GT4000S is more utility-focused — rugged rubber housing, a larger profile, and a bold LED screen that gives it a more tool-like appearance.
Both carry IP65 ratings for dust and water resistance. Both will handle rain, mud splashes, and job sites without issue. Neither should be submerged — and one Amazon reviewer learned that lesson the hard way in a mudhole on their SXS.
If portability is the priority — commuters, solo drivers, glovebox storage — the GBX45 is the clear winner. If you have more space and need more power, the GT4000S’s extra size is a fair trade. Winner: NOCO GBX45.
Price and Value: Is the NOCO GBX45 Worth More Than the Gooloo GT4000S?
The Gooloo GT4000S wins on value — and it’s one of the clearest wins in this comparison. On Amazon, the standalone GT4000S typically runs around $99.99. The NOCO GBX45 sits at approximately $124.95.
That means the GT4000S is cheaper — while delivering 3.2x more peak amps, nearly 3x more battery capacity, 10x more jump starts per charge, a larger flashlight, and a full status screen. That’s a significant value difference.
Put simply: the GT4000S gives you more of everything for less money. The GBX45’s premium is really about brand trust, compactness, and the Manual Override feature — not raw specs.
The GBX45’s value case is built on NOCO’s reputation, USA engineering, and the ultra-fast 48-minute recharge time. It also comes in slightly lighter and smaller — which does matter if you drive a compact car where space is tight.
But if you’re comparing pure performance per dollar, the GT4000S wins this category without question. A $25 difference that buys you 10x the jump starts and 2.5x the engine capacity is not a close call.
The GT4000S delivers far more capability at a lower price. Unless you specifically need the NOCO brand, Manual Override, or ultra-compact size, the GT4000S is the better value. Winner: Gooloo GT4000S.
Safety Features and Unique Tools: What Sets These Two Apart?
Both jump starters are safe to use. Both have reverse polarity protection and spark-proof technology. But there are three specific safety differences that matter to real buyers — and most comparison articles skip all three.
Manual Override on the NOCO GBX45 — What It Does and When to Use It
The GBX45 can detect lead-acid batteries down to 2V. Below that, it won’t automatically start the boost process. That’s where Manual Override comes in.
To activate it, hold the Manual Override button for 3 seconds. The charge LEDs will chase in sequence. The unit forces jump starting “on” — bypassing the automatic detection system.
When Manual Override is active, ALL safety features are disabled. This includes spark protection and reverse polarity protection. Only use Manual Override when the battery is too deeply discharged to be detected — below 2V. Never use it routinely. Never use it if you’re unsure about the connection. One wrong connection in Manual Override mode can damage both the jump starter and your vehicle’s electronics. Use it as a last resort only. For more details, see NOCO’s official Manual Override guide.
The GT4000S has no Manual Override. If your battery is too deeply discharged, the GT4000S won’t detect it and won’t start. In that specific edge case, the GBX45 has a genuine advantage — it can do something the GT4000S simply cannot.
GT4000S LED Screen — More Than Just a Charge Indicator
The GT4000S’s 3.2-inch LED screen is genuinely useful for beginners. It shows the current charge percentage, displays “READY” when the clamps are connected correctly, and shows error codes if something is wrong.
The GBX45 uses a series of LED indicators instead. You count the lit LEDs to estimate charge — 1 LED means roughly 25%, 4 LEDs means 100%. It works, but it’s less precise. There’s no “READY” indicator on the GBX45 — the Boost LED just turns white when it detects the battery.
For a first-time jump starter user, the GT4000S screen removes most of the guesswork. That’s a meaningful advantage for anyone who isn’t confident with automotive tools.
The U.S. Consumer Product Safety Commission (CPSC) maintains guidance on lithium battery safety for consumer products. When buying any lithium jump starter, check that it has spark-proof technology, reverse polarity protection, and temperature management. Both the GBX45 and GT4000S meet these standards. Read more at CPSC’s battery safety page.
Cable Length: A Small Complaint With a Real Impact
Multiple GBX45 users on Amazon mention that the cable length feels short — particularly in trucks and larger vehicles where the battery is mounted far from the engine bay. Some have purchased extension cables from NOCO’s accessory line (like the GBC007 18.5-inch X-Connect adapter) to solve this.
The GT4000S ships with heavier-duty cables that are slightly longer by design. For large trucks, this is a real-world convenience win. It’s a minor point — but worth knowing before you’re standing in a dark parking lot trying to reach a battery in the back of a full-size truck.
Real-World Use Cases: Which One Wins?
- Dead battery in a Honda Civic or Toyota Camry: GBX45 wins — compact, perfectly sized for small engines, no need for 4,000A on a 4-cylinder.
- Starting a Ford F-250 6.7L Power Stroke diesel: GT4000S wins — the GBX45’s 4.0L diesel limit can’t handle this engine. Only the GT4000S qualifies.
- Cold January morning at -4°F (-20°C): GT4000S wins — its wider operating range (up to 140°F vs GBX45’s 122°F) gives it a small edge in extreme heat; both start at -4°F minimum.
- Fleet mechanic needing to start 20 vehicles in a day: GT4000S wins — 60 starts per charge vs just 6 on the GBX45 makes this no contest.
- Battery deeply discharged below 2V: GBX45 wins — Manual Override is the only tool for this job. The GT4000S has no equivalent feature.
- Charging a MacBook at a remote jobsite: GT4000S wins — 100W USB-C output charges a MacBook at full speed. The GBX45 does 60W, which is slower for most laptops.
Who Should Buy the NOCO GBX45?
- You drive a car, sedan, or compact SUV with an engine under 6.5L gas or 4.0L diesel.
- You want the lightest, most portable jump starter available — 2.16 lbs fits anywhere.
- You’ve had batteries go deeply dead before and need Manual Override as a backup.
- You value NOCO’s premium brand reputation and 1-year warranty coverage.
- You want the fastest recharge time — 48 minutes to full via 60W USB-C.
Who Should Buy the Gooloo GT4000S?
- You drive a full-size pickup truck, diesel SUV, RV, or heavy-duty vehicle with a large engine.
- You need up to 60 jump starts per charge — for fleet use, mechanic work, or multi-vehicle households.
- You want maximum value — more power and more starts for a lower price than the GBX45.
- You want a clear LED screen that shows charge percentage and READY status for beginner-friendly use.
- You need to charge a laptop at 100W while you’re on a job or road trip.
Who Should NOT Buy Either One?
- You need to start a 24V diesel truck or semi — neither product supports 24V systems. Look at the NOCO GB250+ or a dedicated 24V booster.
- You’re managing an entire commercial fleet of diesel trucks daily — the NOCO GBX155 (4,250A) or a heavy-duty lead-acid booster pack like the Clore JNC660 is a better fit.
- Your budget is under $60 — the NOCO GB20 or Gooloo GP2000 are solid options at lower price points.
How to Maintain Your Jump Starter
The most common reason a jump starter fails when you need it most is neglect. A few simple habits keep both the GBX45 and GT4000S ready for years of use.
Charge your jump starter at least once a month. Even if you haven’t used it. Lithium batteries lose charge over time from self-discharge. The GT4000S claims 24-month standby, but that’s a maximum under ideal conditions — regular monthly charging ensures it’s actually ready.
Keep it away from extreme heat. Never leave it on the rear parcel shelf or in a hot trunk during summer. Temperatures above 104°F (40°C) accelerate lithium battery degradation. The GT4000S’s limit is 140°F — but chronic heat exposure still shortens its life. Store it somewhere cool and shaded between uses.
Never leave it deeply discharged for months. A lithium battery that sits at 0% for a long time can become permanently damaged or refuse to charge. If your jump starter dies unexpectedly, charge it right away — don’t let it sit dead in your glove box for three months.
Do not use Manual Override (GBX45) repeatedly as a routine starting method. Manual Override disables all safety protections. Using it repeatedly on a battery that isn’t critically discharged puts both your jump starter and your vehicle at risk. Use it only when the battery is below 2V and the unit can’t detect it automatically.
After heavy use on large engines, recharge promptly. The GT4000S especially draws significant power starting large diesel engines. Letting it sit at very low charge after a heavy-use session can accelerate cell wear. Plug it in within a day of heavy use.
Final Verdict
The Gooloo GT4000S is the overall winner. It delivers more power, more starts, more charging options, and a better LED screen — all at a lower price than the NOCO GBX45.
If you drive a truck, RV, or diesel vehicle, the GT4000S isn’t just better — it’s the only one of these two that can actually start your engine. If you drive a compact car or small SUV and want the lightest, most premium option with Manual Override capability, the GBX45 is still an excellent choice.
Buy the GT4000S if you need raw power and value. Buy the GBX45 if you need compact portability or Manual Override for deeply dead batteries. Either way, you’ll have a serious upgrade over traditional jumper cables. — Alex Rahman
NOCO Boost X GBX45: 1250A UltraSafe Jump Starter
Best for compact cars, everyday drivers, and anyone who needs Manual Override for deeply discharged batteries.
GOOLOO GT4000S Jump Starter 4000 Amp
Best for truck owners, diesel drivers, fleet managers, and anyone who wants maximum power and value.
Frequently Asked Questions
Which is better — NOCO GBX45 or Gooloo GT4000S?
The Gooloo GT4000S is better for most buyers. It delivers 4,000 peak amps vs 1,250A, handles engines up to 12.0L gas and 10.0L diesel, and costs less. The GBX45 is the better choice if you want a compact unit for a small car or need Manual Override for deeply discharged batteries.
What is the difference between the NOCO GBX45 and the Gooloo GT4000S?
The biggest differences are power and size. The GT4000S delivers 3.2x more peak amps, holds nearly 3x more battery capacity, and delivers up to 60 jump starts vs the GBX45’s 6. The GBX45 is lighter, faster to recharge (48 min vs 72 min), and has a Manual Override feature the GT4000S lacks.
Is the NOCO GBX45 worth the extra money compared to the Gooloo GT4000S?
Not for most buyers — the GT4000S actually costs less on Amazon while offering more power and more starts. The GBX45’s premium is justified only if you specifically need its ultralight design, 7 LED modes, or Manual Override for deeply dead batteries below 2V.
Does the Gooloo GT4000S work in cold weather?
Yes — the GT4000S operates down to -4°F (-20°C), the same low-end rating as the GBX45. Neither has a battery pre-heating function (that’s found on the Gooloo GT4000, a different model). Both will start vehicles in typical winter conditions, but performance may be reduced in extreme cold.
How many times can the Gooloo GT4000S jump start a car before it needs recharging?
Up to 60 jump starts per full charge under ideal conditions. The NOCO GBX45 delivers up to 6 starts per charge. For fleet use or anyone who needs multiple jumps in one day, the GT4000S is the clear winner by a wide margin.
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I’m Alex Rahman, a car enthusiast and automotive writer focused on practical solutions, car tools, and real-world driving advice. I share simple and honest content to help everyday drivers make better decisions.