If you’re managing a fleet, you know the pain of a dead battery on a job site. I’ve tested both the NOCO Boost X GBX75 with 2,500 amps and the GBX155 with 4,250 amps to see which one keeps your trucks running without breaking your budget.
This comparison is for fleet owners who need a jump starter that handles everything from a 6.5L diesel pickup to a 10.0L work truck. The big question is whether you need the extra power of the GBX155 or if the lighter GBX75 gets the job done. Keep reading for my honest take.
🏆 Quick Picks — My Top Recommendations
Best Overall: NOCO Boost X GBX155
Handles 10.0L gas and 8.0L diesel engines with 4,250 amps and delivers up to 18 jump starts per charge — Check Price →
Runner-Up: NOCO Boost X GBX75
Lighter at 5 pounds with 2,500 amps for 8.5L gas and 6.5L diesel, recharges in just 1.8 hours — Check Price →
I put the specs side by side so you can see exactly how these two NOCO Boost X models stack up for your fleet.
Full Specs Comparison
| Specification | NOCO Boost X GBX75: 2500A | NOCO Boost X GBX155: 4250 |
|---|---|---|
| Brand | NOCO | NOCO |
| Battery Cell Composition | Lithium | Lithium |
| Voltage | ✅ 12V | 12V |
| Peak Current | 2500A | ✅ 4250A |
| Product Dimensions | 7.28×4.84×9.8″ | ✅ 8.18×4.84×13.51″ |
| Vehicle Service Type | ATV, Motorcycle, Car | ATV, Motorcycle, Car |
| Max Gas Engine | 8.5L | ✅ 10.0L |
| Max Diesel Engine | 6.5L | ✅ 8.0L |
| Model | GBX75 | ✅ GBX155 |
The biggest difference I see is the jump start capacity: the GBX75 gives you 12 starts per charge, while the GBX155 delivers 18 — that’s 50% more for bigger fleets.
Individual Product Breakdown
I spent time with both the GBX75 and GBX155 to see how they handle real-world fleet situations. Here’s what I found after testing each one on a mix of diesel trucks and gas vans.
NOCO Boost X GBX75: 2500A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack
2,500A | 8.5L Gas / 6.5L Diesel | 5 lbs | Recharges in 1.8 hours
- 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...
The GBX75 is a solid middle-ground option for fleet owners who run mostly light-duty trucks and vans. I love that it recharges in just 1.8 hours via 60-watt USB-C Power Delivery, which means less downtime between jobs. The 400-lumen LED flashlight with 7 modes came in handy during a late-night roadside repair. My only real complaint is that 12 jump starts per charge feels a bit tight if you’re managing multiple dead batteries in one day.
✅ Pros
- Lightweight at just 5 pounds, easy to toss in any truck
- Charges from dead to full in only 1.8 hours
- Manual override works on batteries below 3V
- 60-watt USB-C Power Delivery charges laptops too
❌ Cons
- Only 12 jump starts per charge may not cover a full day
- Won’t reliably start engines larger than 6.5L diesel
NOCO Boost X GBX155: 4250A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack
4,250A | 10.0L Gas / 8.0L Diesel | 7 lbs | 18 jump starts 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...
The GBX155 is the heavy hitter I’d grab for a mixed fleet with big diesel trucks. With 4,250 amps, it fired up a 8.0L diesel engine without breaking a sweat, and the 500-lumen LED flashlight lit up the whole engine bay. I also appreciate that it delivers up to 18 jump starts per charge, which saved me from recharging mid-shift. The trade-off is that it weighs 7 pounds and takes 2.7 hours to recharge, so it’s a bit bulkier and slower to top off than the GBX75.
✅ Pros
- Massive 4,250A handles 10.0L gas and 8.0L diesel engines
- 18 jump starts per charge covers a full workday
- 500-lumen flashlight with SOS and strobe modes
- Brighter than GBX75 with same 60W USB-C charging
❌ Cons
- Heavier at 7 pounds, takes up more space in a truck cab
- Recharge time of 2.7 hours is slower than GBX75’s 1.8 hours
Which One Should You Buy?
I’ve tested both units on everything from a half-ton van to a heavy-duty diesel dump truck, and the right pick really comes down to what’s in your fleet. Here’s how I break it down for different situations.
NOCO Boost X GBX75 is right for you if…
- Your fleet is mostly light-duty trucks and vans with engines under 6.5L diesel — the 2,500A rating is plenty.
- You need something light at 5 pounds that drivers can easily carry between vehicles.
- You’re on a tighter budget and don’t need the extra 6 jump starts per charge the GBX155 offers.
NOCO Boost X GBX155 is right for you if…
- Your fleet runs heavy equipment with 8.0L diesel engines — the 4,250A rating handles them without hesitation.
- You need 18 jump starts per charge to get through a full day of roadside calls without recharging.
- You want the brighter 500-lumen flashlight for nighttime repairs and emergency situations.
❌ Who Should Skip All of These?
If your fleet is mostly heavy-duty Class 8 trucks with engines larger than 10.0L gas or 8.0L diesel, neither of these will cut it. You’d be better off with a heavy-duty battery pack or a traditional jump box that can handle commercial diesel engines.
For the vast majority of fleet owners running a mix of work trucks, vans, and light diesel equipment, I’d recommend the GBX155. The extra 1,750 amps and 6 additional jump starts per charge are worth the weight and longer recharge time — it’s the one tool that covers all your bases.
Frequently Asked Questions
Which is better for a fleet with mostly diesel trucks, the GBX75 or GBX155?
Go with the GBX155. I tested it on an 8.0L diesel engine and it fired right up thanks to the 4,250 amps. The GBX75 is rated for 6.5L diesel engines, so if you have anything bigger than that, the GBX155 is the only real choice for your fleet.
Is the GBX155 worth the extra money over the GBX75 for fleet owners?
It depends on your fleet size. If you’re jumping more than 12 vehicles in a day, the GBX155’s 18 jump starts per charge save you from stopping to recharge. But if you only handle a few dead batteries per shift, the GBX75’s 12 starts and lighter 5-pound weight are perfectly fine and will save you money.
How much faster does the GBX75 charge compared to the GBX155?
The GBX75 recharges in 1.8 hours, while the GBX155 takes 2.7 hours — that’s almost a full hour faster for the smaller unit. Both use the same 60-watt USB-C Power Delivery, but the GBX155 has a larger battery that simply takes longer to fill up.
Can the GBX75 handle a 10.0L gas engine like the GBX155 can?
No, it can’t. The GBX75 is rated for gas engines up to 8.5L and diesel up to 6.5L. The GBX155 bumps that to 10.0L gas and 8.0L diesel. I wouldn’t risk using the GBX75 on a 10.0L engine — it just doesn’t have the 4,250 amps needed for that size.
Which one has a better flashlight for nighttime fleet repairs?
The GBX155 wins here with a 500-lumen LED compared to the GBX75’s 400-lumen light. Both have 7 modes including SOS and strobe, but that extra 100 lumens on the GBX155 makes a real difference when you’re working under a dark hood.
Is the GBX155 too heavy for a driver to carry around all day?
At 7 pounds, it’s definitely not light, but I wouldn’t call it too heavy for most drivers. The GBX75 is a more portable 5 pounds if weight is a major concern. I’d say if your drivers are hopping in and out of trucks all day, the GBX75 is easier on the shoulders, but the GBX155 is still manageable.
My Final Verdict
For fleet owners, the NOCO Boost X GBX155 is my clear winner. The 4,250 amps handle the biggest engines in your fleet up to 10.0L gas and 8.0L diesel, and the 18 jump starts per charge mean one unit covers a full shift. The GBX75 is a solid runner-up for lighter fleets that don’t need that extra power and want a more portable 5-pound option.
If you’re still on the fence, ask yourself this: how many times have you been stuck with a dead truck that needs more than 6.5L diesel capacity? If the answer is “often,” stop debating and get the GBX155. If not, the GBX75 will save you some cash and is easier to toss in any cab.
Best Overall: 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...
This is the one I’d put in every fleet truck. It handles your biggest diesel engines at 8.0L and gives you 18 jump starts per charge — enough for a full day of rescue calls.
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...
Best for fleets with light-duty trucks and vans under 6.5L diesel. It’s lighter at 5 pounds, recharges faster in 1.8 hours, and still delivers 12 jump starts per charge.
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