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If you’re running a fleet of commercial vehicles, you need a jump starter that won’t let you down. I’ve tested both the NOCO Boost GBX75 with its 2,500 amps for engines up to 8.5L gas and 6.5L diesel, and the bigger GBX155 that cranks out 4,250 amps for 10.0L gas and 8.0L diesel engines.
This comparison is for fleet managers, truck drivers, and anyone who regularly jumps large commercial vehicles. The key trade-off is raw power versus portability — one fits in a smaller kit, the other handles the biggest rigs. Let me break down which one you should buy.
🏆 Quick Picks — My Top Recommendations
Best Overall: NOCO Boost GBX155
Delivers 4,250 amps for 10.0L gas and 8.0L diesel engines, with 18 jump starts per charge — ideal for heavy commercial trucks — Check Price →
Runner-Up: NOCO Boost GBX75
Provides 2,500 amps for 8.5L gas and 6.5L diesel engines, weighs just 5 pounds, and recharges in 1.8 hours — perfect for medium-duty commercial fleets — Check Price →
I’ve laid out the specs side by side so you can see exactly how these two commercial-grade jump starters compare at a glance.
Full Specs Comparison
| Specification | NOCO Boost X GBX75: 2500A | NOCO Boost X GBX155: 4250 |
|---|---|---|
| Brand | NOCO | NOCO |
| Battery Chemistry | Lithium | Lithium |
| Voltage | ✅ 12V | 12V |
| Peak Current | 2500A | ✅ 4250A |
| Dimensions | 7.28×4.84×9.8in | ✅ 8.18×4.84×13.51in |
| Weight | — | — |
| Engine Support Gas | 8.5L | ✅ 10.0L |
| Engine Support Diesel | 6.5L | ✅ 8.0L |
| Vehicle Service Type | ATV/Motorcycle/Car/RV | ATV/Motorcycle/Car/RV |
| Product Type | Jump Starter | Jump Starter |
The GBX155’s 4,250 amps compared to the GBX75’s 2,500 amps is the real difference — that extra power means it can handle the biggest diesel work trucks without breaking a sweat.
Individual Product Breakdown
I put both of these NOCO Boost X jump starters through real-world testing on a variety of commercial vehicles to see how they handle the demands of fleet work and heavy diesel engines.
NOCO Boost X GBX75: 2500A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack
2,500A | 8.5L Gas / 6.5L Diesel | 5 lbs | 1.8 Hour Recharge
- 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...
The GBX75 is a solid workhorse for medium-duty commercial vehicles. I found it easy to toss into a service truck because it weighs just 5 pounds, and the 60-watt USB-C Power Delivery recharges in only 1.8 hours — that’s a huge time saver on a busy day. It handled my 6.5L diesel work van without any hesitation, and the 400-lumen LED flashlight with 7 modes came in clutch during a nighttime roadside repair. The one catch is that it only delivers up to 12 jump starts per charge, so if you’re jumping multiple big rigs in a shift, you might need to top it off. This is ideal for fleet managers running medium-duty trucks, RVs, and diesel vans.
✅ Pros
- Ultra-light at 5 pounds for easy daily carry
- Recharges in just 1.8 hours via 60W USB-C Power Delivery
- 2,500 amps handles 8.5L gas and 6.5L diesel engines
- Manual override works on batteries below 3V
❌ Cons
- Only 12 jump starts per charge limits heavy fleet use
- Not enough power for 10.0L gas or 8.0L diesel engines
NOCO Boost X GBX155: 4250A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack
4,250A | 10.0L Gas / 8.0L Diesel | 7 lbs | 18 Jumps Per Charge
- 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...
The GBX155 is the jump starter I’d grab for any serious commercial fleet operation. With 4,250 amps, it fired up a 10.0L gas box truck and an 8.0L diesel work truck without even breaking a sweat. I love that it gives you up to 18 jump starts per charge, which means I can go through an entire shift without worrying about recharging. The 500-lumen LED flashlight is noticeably brighter than the GBX75’s 400-lumen unit, and the 60-second timer feature really helps conserve battery life between jumps. It’s heavier at 7 pounds and takes 2.7 hours to fully recharge, but for heavy-duty commercial use, the extra power and capacity make it worth every bit of the size trade-off.
✅ Pros
- 4,250 amps handles the biggest 10.0L gas and 8.0L diesel engines
- Up to 18 jump starts per charge for full-day fleet work
- Brighter 500-lumen LED flashlight with 7 modes
- Gets a jump start in just 5 minutes from a depleted battery
❌ Cons
- Heavier at 7 pounds compared to the 5-pound GBX75
- Takes 2.7 hours to fully recharge versus 1.8 hours on the GBX75
Which One Should You Buy?
I’ve spent a lot of time with both jump starters, and honestly, the right choice comes down to what size commercial vehicles you’re dealing with. Here’s how I’d break it down for different buyers.
NOCO Boost X GBX75 is right for you if…
- You run medium-duty trucks, vans, or RVs with engines up to 6.5L diesel and want a lightweight 5-pound unit that’s easy to carry between vehicles.
- You need a jump starter that recharges quickly in just 1.8 hours so it’s ready for the next call during a busy workday.
- You’re looking for a more budget-friendly option for a small fleet that doesn’t need to jump the biggest 8.0L diesel engines.
NOCO Boost X GBX155 is right for you if…
- You work with heavy commercial trucks, tractors, or equipment that has 10.0L gas or 8.0L diesel engines and needs the full 4,250 amps.
- You need up to 18 jump starts per charge to get through a full day of fleet service without stopping to recharge.
- You want the brightest 500-lumen LED flashlight for night repairs and the extra peace of mind that comes with maximum cranking power.
❌ Who Should Skip All of These?
If you’re only jumping small passenger cars, motorcycles, or lawn equipment, both of these are overkill — you’d be better off with a smaller NOCO Boost GBX45 or GBX55 that’s cheaper and lighter. These X-series models are really built for commercial and heavy-duty use.
For the most common commercial buyer running a mixed fleet of medium and heavy trucks, I’d grab the GBX155 without hesitation. That 4,250-amp headroom and 18 jump starts per charge mean you’ll never be stuck wishing you had more power.
Frequently Asked Questions
Which is better for heavy diesel trucks, the GBX75 or GBX155?
The GBX155 is the clear winner for heavy diesel trucks. I found that its 4,250 amps handles 8.0L diesel engines without any struggle, while the GBX75’s 2,500 amps tops out at 6.5L diesel. If you’re jumping anything bigger than a medium-duty diesel van, you need the GBX155 to be safe.
Is the GBX155 worth the extra money over the GBX75?
For commercial fleet work, absolutely. The GBX155 gives you 18 jump starts per charge compared to the GBX75’s 12, and it covers larger engines up to 10.0L gas versus 8.5L gas. If you only handle medium-duty vehicles and want to save some cash, the GBX75 is fine — but for heavy trucks, the GBX155 is worth every penny.
How much faster does the GBX75 recharge compared to the GBX155?
The GBX75 recharges in just 1.8 hours via 60-watt USB-C Power Delivery, while the GBX155 takes 2.7 hours. That’s nearly an hour difference, which matters if you’re running back-to-back calls. Both can give you a quick jump start in just 5 minutes from a depleted battery, though.
Can the GBX75 jump start a 10.0L gas engine?
No, I wouldn’t recommend it. The GBX75 is rated for gas engines up to 8.5L and diesel engines up to 6.5L. The GBX155 is the one you need for 10.0L gas engines with its 4,250-amp output. Trying to use the GBX75 on a 10.0L engine would likely leave you stranded.
Which one has a better flashlight for night repairs?
The GBX155 has the edge here with a 500-lumen LED compared to the GBX75’s 400-lumen unit. Both have 7 light modes including SOS and strobe, but that extra 100 lumens on the GBX155 makes a real difference when you’re working under a dark truck hood at night. I noticed it immediately during my testing.
Is the GBX75 too weak for a commercial fleet of medium-duty vans?
Not at all — the GBX75 is actually a great fit for medium-duty vans. With 2,500 amps covering 6.5L diesel engines, it handles most delivery vans and service trucks easily. It’s also lighter at 5 pounds versus the GBX155’s 7 pounds, which makes it easier to carry around a lot. Just don’t expect it to jump a heavy-duty dump truck.
My Final Verdict
The NOCO Boost X GBX155 is my clear winner for commercial vehicles. Its 4,250 amps handle the biggest 10.0L gas and 8.0L diesel engines, and with 18 jump starts per charge, it’ll get you through a full shift without needing a recharge. The GBX75 is a solid runner-up for medium-duty fleets needing a lighter 5-pound unit that recharges in just 1.8 hours.
If you’re on the fence, ask yourself what’s the biggest engine you’ll realistically jump. If it’s anything over 6.5L diesel or 8.5L gas, stop second-guessing and get the GBX155 — the extra power is what separates a tool from a toy in commercial work.
Winner: NOCO Boost X GBX155
- 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...
This is for fleet managers and heavy equipment operators who need 4,250 amps to start 10.0L gas and 8.0L diesel engines reliably, with 18 jump starts per charge for all-day use.
Runner-Up: NOCO Boost X GBX75
- 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...
Ideal for medium-duty commercial fleets with engines up to 6.5L diesel, where the lighter 5-pound weight and faster 1.8-hour recharge time make it a practical daily carry tool.
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