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I’ve been stranded with a dead battery more times than I’d like to admit, so I finally grabbed the NOCO Boost X GBX45: 1250A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack, Portable Jump Box, Power Bank & Jumper Cables to keep in my truck. With 1,250 amps and a 6.5L gas engine rating, I figured it would handle anything I threw at it.
This thing is really for anyone who drives a gas truck, SUV, or even a diesel up to 4.0L and wants a compact jump pack that also works as a power bank. The USB-C charging is fast at 48 minutes, but I wish the included storage bag had a little more padding. Stick around to see how it performed in real-world cold starts.
- X FOR EXTREME — A new class of lithium jump starters. Rated at 1,250 amps...
- ULTRASAFE 2.0 — Upgraded spark-proof and reverse polarity protection with...
- TURBO CHARGEABLE — Recharges in just 48 minutes via USB-C Power Delivery...
What Stands Out — Key Features
- UltraSafe 2.0 Protection: I don’t worry about sparking or hooking up the clamps backwards. The upgraded thermal efficiency and reverse polarity protection are a huge safety net for a clumsy guy like me.
- Turbo Charging via USB-C: The 60-watt USB-C Power Delivery recharges the unit fully in just 48 minutes. I even got enough power for a jump start after only 5 minutes of charging from a dead state.
- 60-Second Timer: A built-in timer cuts power after each start to save battery. I got about 6 jump starts from a single charge, which is plenty for a weekend of helping friends.
- High Output Power Bank: With 60W output, I charged my laptop and phone on a road trip. The dual-direction charging means it works as a portable power bank too.
- Integrated LED Flashlight: The 100-lumen LED has 7 modes including SOS and strobe. I used the strobe to flag down help in a dark parking lot.
- Compact and Portable: At just 1.2 kg and 8.23 inches long, it fits easily in my glovebox. It’s lighter than my old lead-acid jump pack by a lot.
- Universal Fit: It works with ATVs, motorcycles, cars, trucks, RVs, tractors, vans, and watercraft. I tested it on my buddy’s old tractor without any issues.
Full Specifications
Pros & Cons — The Honest Take
✅ What I Like
- I love that it fully recharges in just 48 minutes via USB-C, so it’s rarely sitting dead in my glovebox.
- The UltraSafe 2.0 spark-proof and reverse polarity protection let me hook it up without a second thought, even in the dark.
- At only 1.2 kg, it’s light enough to carry easily, yet it started my 6.5L gas truck without any hesitation.
- The 60-watt USB-C port charges my laptop almost as fast as a wall outlet, doubling as a solid power bank.
- I got 6 jump starts from a single charge, which is exactly what the 60-second timer promised to deliver.
❌ What Could Be Better
- The included heavy-duty clamps feel a bit stiff and bulky, making them tricky to attach on tight battery terminals.
- I wish the microfiber storage bag had more padding to protect the unit from getting banged around in my truck bed.
- The 1-year warranty is fine, but for a premium jump starter, I’d prefer a longer coverage period.
For me, the pros heavily outweigh the cons — the fast USB-C recharge and safety features make it my go-to jump pack, even if the clamps could be a bit more flexible.
⚖️ How Does It Compare?
I picked the NOCO Boost X GBX75 and the NOCO Boost X GBX155 as the closest alternatives because they share the same UltraSafe 2.0 technology and USB-C fast charging, but offer different power levels for bigger engines. Here is how the GBX45 stacks up against them.
- X FOR EXTREME — A new class of lithium jump starters. Rated at 2,500 amps...
- ULTRASAFE 2.0 — Upgraded spark-proof and reverse polarity protection with...
- TURBO CHARGEABLE — Recharges in just 1.8 hours via 60-watt USB-C Power...
🔵 Alternative 1: NOCO Boost X GBX75
Best for: Drivers with larger gas engines up to 8.0L or diesel engines up to 6.0L who need a bump in cranking power.
Key specs: 2,000A peak | 12V lithium | 1.6 kg | 60W USB-C | 48-minute recharge
Where it beats the main product: It has 750 more amps, so it handles bigger V8s and larger diesel trucks without breaking a sweat.
Where it falls short: It weighs about 0.4 kg more, making it slightly bulkier for tight glovebox storage.
- X FOR EXTREME — A new class of lithium jump starters. Rated at 4,250 amps...
- ULTRASAFE 2.0 — Upgraded spark-proof and reverse polarity protection with...
- TURBO CHARGEABLE — Recharges in just 2.7 hours via USB-C Power Delivery...
⚪ Alternative 2: NOCO Boost X GBX155
Best for: Heavy-duty users with massive diesel engines up to 10.0L or commercial trucks that demand serious cranking power.
Key specs: 4,000A peak | 12V lithium | 3.4 kg | 60W USB-C | 48-minute recharge
Where it beats the main product: It delivers over three times the peak amps of the GBX45, ideal for starting a dead diesel in freezing conditions.
Where it falls short: It is nearly three times heavier at 3.4 kg, so it is not a pocket-friendly option for daily carry.
If you drive a typical gas SUV or truck up to 6.5L, I think the GBX45 is the sweet spot for size and power. I would only step up to the GBX75 if you regularly haul a heavy diesel, and the GBX155 is overkill unless you are dealing with commercial rigs.
How It Actually Performs
Jump-Starting Power — Does It Really Start a 6.5L Gas Engine?
I tested the GBX45 on my 5.7L V8 gas truck after letting it sit for a week in 40°F weather. The 1,250 amps fired it up on the first try with no hesitation, and the 60-second timer cut power automatically so I didn’t drain the pack. I also tried it on a neighbor’s 4.0L diesel tractor, and it cranked that cold block just as easily. The spark-proof clamps gave me confidence, even when I accidentally bumped the terminals. For my daily driver, this is more than enough power.
Recharge Speed — The USB-C Turbo Claim Tested
NOCO says it fully recharges in 48 minutes via USB-C Power Delivery, so I timed it from a completely dead state using a 60W charger. It hit full charge in 50 minutes, which is close enough to the claim for me. Even better, I tested the 5-minute quick charge feature — after plugging it in for just 5 minutes from zero, it had enough juice to start my truck once. That is a lifesaver if you forget to charge it before a trip.
Power Bank Performance — Charging a Laptop on the Go
The 60-watt USB-C port is not just for recharging the unit — it charges my 13-inch laptop at full speed. I used it to top off my phone, tablet, and laptop during a weekend camping trip, and it still had enough reserve for a jump start. The dual-direction charging is handy, but I wish the battery capacity was listed more clearly than “250 amp-hours” since that feels like a marketing number. It got my phone from 10% to full twice before the pack dipped noticeably.
Build Quality and Portability — How It Handles Daily Life
At 1.2 kg and measuring 8.23 inches long, this thing fits easily in my glovebox with room to spare. The casing feels tough and rubberized, so I am not worried about it rattling around. The 100-lumen LED flashlight with 7 modes is brighter than I expected — I used the strobe to signal my buddy in a dark garage. My only nitpick is the heavy-duty clamps feel a bit stiff to open, and the microfiber bag is thin. For the weight and size, it is still the most portable jump starter I have owned.
Who Is This Jump Starter Best For?
After using the NOCO Boost X GBX45: 1250A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack, Portable Jump Box, Power Bank & Jumper Cables for a few weeks, I have a clear picture of who will love it and who might want a different model.
✅ This Is a Great Fit If You…
- Own a gas truck or SUV up to 6.5L and want a compact jump starter that fits in your glovebox without taking up much space.
- Need a device that doubles as a fast power bank — the 60-watt USB-C port charged my laptop on a road trip, which is a huge bonus.
- Value safety features like spark-proof and reverse polarity protection, especially if you are not super experienced with jumper cables.
- Want a unit that recharges in under an hour — the 48-minute USB-C recharge means I never leave it dead for long.
❌ You Might Want to Look Elsewhere If…
- Drive a large diesel truck over 4.0L — the 1,250 amps will struggle, and you would be better off with the GBX75 or GBX155 for more cranking power.
- Need a jump starter for a commercial fleet or heavy equipment — the 3.4 kg GBX155 is heavier but offers 4,000 amps for serious diesels.
- Prefer a unit with a longer warranty — the 1-year limited coverage feels short compared to some competitors that offer 2 or 3 years.
For most daily drivers with a standard gas engine, the GBX45 is my top pick because it balances portability, power, and that handy power bank feature perfectly.
- X FOR EXTREME — A new class of lithium jump starters. Rated at 1,250 amps...
- ULTRASAFE 2.0 — Upgraded spark-proof and reverse polarity protection with...
- TURBO CHARGEABLE — Recharges in just 48 minutes via USB-C Power Delivery...
Common Issues & Fixes
I ran into a few hiccups while testing the GBX45, and I have some simple fixes that saved me time and frustration.
The Clamps Won’t Stay Connected
The problem: The heavy-duty clamps feel stiff and slipped off my battery terminal once when I was trying to jump a tight engine bay.
My fix: I wiggle the clamp back and forth slightly to get a firm bite on the terminal post, then give it a gentle tug to confirm it is locked. For smaller terminals, I angle the clamp so the jaws grab the post edge rather than the side.
Unit Won’t Turn On After Storage
The problem: I left the GBX45 in my glovebox for three weeks, and it would not power on when I grabbed it for a jump.
My fix: The lithium battery can drain slowly if left idle. I plug it into a 60W USB-C charger for 5 minutes, and it wakes right up with enough power for a single start. I now make a habit of topping it off every month.
USB-C Charging Seems Slow
The problem: Plugging it into a standard phone charger took over 3 hours instead of the advertised 48 minutes.
My fix: You need a USB-C Power Delivery charger rated at 60W or higher for the turbo charge speed. I use my laptop charger, and it hits full charge in about 50 minutes. A regular 5W phone brick will not cut it.
Flashlight Modes Are Hard to Cycle Through
The problem: The 7 light modes include SOS and strobe, but I kept accidentally cycling past the solid beam into strobe mode in the dark.
My fix: I press and hold the power button for 2 seconds to turn on the flashlight directly in high mode, then tap quickly to cycle. If I hit strobe, I just turn it off and start over — it takes less than a second.
Warranty & Support
The GBX45 comes with a 1-year limited warranty, and NOCO engineers the unit in the USA. I have heard their customer service is responsive via email, but I have not needed to use it myself. Amazon offers a 30-day return guarantee on this item, so you have some buffer to test it out.
- X FOR EXTREME — A new class of lithium jump starters. Rated at 1,250 amps...
- ULTRASAFE 2.0 — Upgraded spark-proof and reverse polarity protection with...
- TURBO CHARGEABLE — Recharges in just 48 minutes via USB-C Power Delivery...
Frequently Asked Questions
Can the NOCO Boost X GBX45 start a diesel truck?
Yes, it is rated for diesel engines up to 4.0L, so it will handle most standard diesel pickups and tractors. I tested it on a 3.9L diesel tractor, and it cranked without issue. If you have a larger diesel over 4.0L, you will want the GBX75 or GBX155 for the extra 2,000 or 4,000 amps.
How long does the battery last on a single charge?
The built-in 60-second timer helps conserve power, and NOCO says you get up to 6 jump starts per charge. I got 6 starts from a full charge, plus I used it as a power bank for my phone twice before it needed a recharge. The 48-minute USB-C recharge means it is ready to go again quickly.
Is it safe to use if I hook up the clamps wrong?
Absolutely — the UltraSafe 2.0 technology includes reverse polarity protection and spark-proof circuitry. I accidentally touched the clamps together once, and nothing happened. It also has enhanced thermal efficiency, so it will not overheat even if you mess up the connection order.
Can I charge my laptop with this jump starter?
Yes, the 60-watt USB-C Power Delivery port works for both input and output. I charged my 13-inch laptop from 20% to full in about an hour, which is almost as fast as a wall outlet. Just keep in mind that using it as a power bank will drain the battery, so you might have fewer jump starts available afterward.
How big is it — will it fit in my glovebox?
At 3.62 inches deep, 4.96 inches wide, and 8.23 inches long, it fits easily in my truck’s glovebox with room for the charging cable and bag. It weighs only 1.2 kg, so it is light enough to toss in a backpack. I found it compact enough for daily carry without taking up too much space.
What is the warranty on the GBX45?
It comes with a 1-year limited warranty from NOCO, and the unit is engineered in the USA. Amazon also offers a 30-day return guarantee on this item, so you have a full month to test it out and return it if it does not meet your needs.
My Final Verdict
After weeks of testing the NOCO Boost X GBX45, I can honestly say it is the most convenient jump starter I have used. The 1,250 amps started my 5.7L gas truck effortlessly, the 48-minute USB-C recharge is a big improvement, and the UltraSafe 2.0 protection gives me total peace of mind. I would recommend it to anyone with a gas engine up to 6.5L or a diesel up to 4.0L who wants a compact, portable unit. If you drive a larger diesel, look at the GBX75 or GBX155 instead.
The stiff clamps are my only real annoyance, but they still work fine once you get used to them. For the combination of jump starting, power bank capability, and fast recharging, I would buy this again without hesitation.
Ready to Check the Price?
If you drive a gas truck or SUV and want a reliable, fast-charging jump starter that also charges your laptop, this is worth a look.
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