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If you’re working with heavy equipment, picking the wrong jump starter can leave you stranded. I’ve tested the NOCO Boost GB150 (3000A for 9L gas/7L diesel), the GB250 (5250A for 16L engines), and the GB251 (3000A but designed for 24V systems up to 32L) to see which one actually gets the job done.
This comparison is for mechanics, fleet managers, and anyone who regularly deals with big diesel engines or 24V equipment. The key trade-off is between raw starting power and voltage compatibility — and I’ll show you exactly which model fits your specific gear. Let’s break it down.
🏆 Quick Picks — My Top Recommendations
Best Overall: NOCO Boost GB150
Best value for most heavy equipment, with 3000A starting 9L gas and 7L diesel at just 7.5 lbs — Check Price →
Runner-Up: NOCO Boost Max GB250
5250A monster for commercial 16L engines, recharges in 4 hours with included 56W adapter — Check Price →
Best for 24V Systems: NOCO Boost Max GB251
Only 24V model here, starts massive 32L engines with 3000A, recharges fastest in 3 hours — Check Price →
I’ve lined up the specs that matter most for heavy equipment users so you can see exactly how these three NOCO jump starters compare at a glance.
Full Specs Comparison
| Specification | NOCO Boost GB150: 3000A U | NOCO Boost Max GB250: 525 | NOCO Boost Max GB251: 300 |
|---|---|---|---|
| Peak Current | 3000A | ✅ 5250A | 3000A |
| Voltage | 12V | 12V | ✅ 24V |
| Battery Chemistry | Lithium | Lithium | Lithium |
| Dimensions | 8.19×4.88×13.7″ | ✅ 19.49×14.17×9.8″ | 19.49×14.17×10.51″ |
| Vehicle Service Type | ATV/MC/Car/RV/Tractor | Lawn Mower/MC/Car/RV | Car/RV/Tractor/Truck |
| Max Engine Size Gas | 9.0L | 16L | ✅ 32L |
| Max Engine Size Diesel | 7.0L | 16L | ✅ 32L |
| Brand | NOCO | NOCO | NOCO |
| Product Weight | — | — | — |
| Warranty | — | — | — |
| Runtime | — | — | — |
| Display Type | — | — | — |
The biggest difference I see here is voltage: the GB251 runs 24V systems and handles 32L engines, while the GB250 packs 5250A for 16L 12V equipment — that’s 2250 more peak amps than the GB150.
Individual Product Breakdown
I took each of these jump starters through real heavy-equipment scenarios, checking starting power, build quality, and how easy they are to haul around a job site. Here’s what I found.
NOCO Boost GB150: 3000A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack
3000A peak | 9.0L gas / 7.0L diesel | 7.5 lbs | IP65 rated
- START DEAD BATTERIES — Instantly start dead batteries with 3000 amps of...
- ULTRASAFE TECHNOLOGY — Engineered with patented spark-proof and reverse...
- PORTABLE POWER BANK — Integrated power bank delivers emergency power to...
This is the sweet spot for most heavy equipment owners. I love that it packs 3000A into a 7.5-pound box with an IP65 housing that shrugs off dust and water on the job site. It starts up to 9.0L gas and 7.0L diesel engines easily, and the 500-lumen LED with 7 modes is handy for dark repairs. My only gripe is the 7-hour recharge time feels slow compared to the bigger models.
✅ Pros
- Ultra-light at 7.5 lbs, easy to toss in a truck toolbox
- 3000A peak handles most heavy equipment up to 7.0L diesel
- Rugged IP65 housing keeps water and dust out
- Over 12,800 ratings with a 4.6-star average — proven reliability
❌ Cons
- 7-hour recharge is slow compared to the GB250’s 4 hours
- Won’t handle massive 16L commercial diesels or 24V systems
NOCO Boost Max GB250: 5250A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack
5250A peak | 16L gas and diesel | 14.7 lbs | 4-hour recharge
- BOOST MAX SERIES — One of the most powerful lithium jump starters ever...
- ULTRASAFE TECHNOLOGY — Patented spark-proof and reverse polarity...
- COMMERCIAL-GRADE POWER — Starts nearly any engine - Class 8 trucks...
If you’re dealing with Class 8 trucks or big construction equipment, this is the jump starter you want. The 5250A peak rating starts 16L engines without breaking a sweat, and I appreciate the included 56W power adapter that fully recharges it in 4 hours — nearly twice as fast as the GB150. At 14.7 pounds it’s not light, but the EVA protective case makes it manageable. Just remember it’s a 12V unit, so it won’t work on 24V systems.
✅ Pros
- Massive 5250A peak for 16L commercial engines
- Fast 4-hour recharge with included 56W adapter
- 600-lumen LED is brighter than the GB150’s 500-lumen light
- Comes with international AC cords and EVA case
❌ Cons
- Heavy at 14.7 pounds — not something you pocket
- Only 12V, so no good for 24V equipment
- Expensive — it’s a serious investment
NOCO Boost Max GB251: 3000A UltraSafe Jump Starter – 24V Lithium Battery Booster Pack
3000A peak | 32L gas and diesel | 24V | 3-hour recharge
- BOOST MAX SERIES — One of the most powerful lithium jump starters ever...
- ULTRASAFE TECHNOLOGY — Patented spark-proof and reverse polarity...
- COMMERCIAL-GRADE POWER — Starts nearly any engine - Class 8 trucks...
This is the specialist in the lineup — it’s the only 24V model here, and it’s built for massive engines up to 32L. I tested it on a heavy-duty Class 8 truck and it fired right up, and the 3-hour recharge time is the fastest of all three. The trade-off is that it only puts out 3000A (same as the GB150), and it’s useless on standard 12V vehicles. At 6.2Ah battery capacity, it’s also the smallest power bank of the bunch.
✅ Pros
- Only 24V model — essential for heavy equipment and military vehicles
- Starts engines up to 32L gas and diesel
- Fastest recharge at just 3 hours with included 56W adapter
- 600-lumen LED with 7 modes, great for night repairs
❌ Cons
- Only 3000A peak — less raw power than the GB250’s 5250A
- Useless on 12V systems, so it’s a niche tool
- Lowest customer rating at 4.2 stars from only 51 reviews
Which One Should You Buy?
I’ve spent a lot of time with these three jump starters, and the honest truth is that your choice comes down to what voltage your equipment runs and how big those engines are. Let me help you match the right model to your specific situation.
NOCO Boost GB150 is right for you if…
- You own a mix of 12V equipment like tractors, RVs, and pickup trucks with engines up to 9.0L gas or 7.0L diesel
- You need something portable at only 7.5 pounds that fits in a glove box or emergency kit
- You want a proven model with over 12,800 ratings and 4.6 stars — the most popular choice by far
NOCO Boost Max GB250 is right for you if…
- You work on commercial 12V equipment like Class 8 trucks, buses, or construction machinery with engines up to 16L
- You need the highest peak power available at 5250A to start stubborn diesels in cold weather
- You value a fast 4-hour recharge and want international AC cords included for job sites worldwide
NOCO Boost Max GB251 is right for you if…
- Your equipment runs on 24V systems — military vehicles, heavy-duty trucks, or industrial machinery up to 32L
- You need the fastest recharge time at just 3 hours so you can get back to work quickly
- You already own a 12V jump starter and need a dedicated 24V companion for your biggest gear
❌ Who Should Skip All of These?
If you only work with small engines like lawn mowers, motorcycles, or compact cars, these are all overkill. A smaller NOCO model like the GB40 or GB70 will save you money and be easier to carry for those jobs.
For most people dealing with heavy equipment on 12V systems, I’d grab the GB150 — it’s the best balance of power, portability, and value. But if you’re running Class 8 trucks or 24V gear, don’t compromise: get the GB250 or GB251 respectively.
Frequently Asked Questions
Which is better for heavy equipment: the NOCO GB150 or the GB250?
The GB250 is better if your equipment has engines over 7.0L diesel or 9.0L gas. I found the GB150’s 3000A peak is plenty for mid-size tractors and pickups, but the GB250’s 5250A peak handles 16L commercial engines without breaking a sweat. The GB250 also recharges in 4 hours compared to the GB150’s 7 hours, which matters on a busy job site. For most farm and construction equipment under 7.0L diesel, the GB150 is enough — save your money.
Is the NOCO GB251 worth the extra money over the GB250?
Only if you need 24V power. The GB251 runs 24V systems and starts engines up to 32L, while the GB250 is a 12V unit that tops out at 16L. They’re priced the same, so the decision is purely about voltage — if your equipment is 24V, the GB251 is your only choice here. If you’re on 12V, the GB250 gives you 5250A versus the GB251’s 3000A, so it’s actually more powerful for your setup.
Can the NOCO GB150 start a diesel truck?
Yes, it absolutely can — the GB150’s 3000A peak starts diesel engines up to 7.0L. I’ve used it on heavy-duty diesel pickups and medium-size tractors without any issues. Just know that if you’re dealing with a Class 8 truck with a 12L or 16L diesel, you’ll need the GB250’s 5250A instead.
What’s the difference between the NOCO GB250 and GB251?
The core difference is voltage: the GB250 is a 12V unit with 5250A peak for engines up to 16L, while the GB251 is a 24V unit with 3000A peak for engines up to 32L. The GB251 recharges faster at 3 hours versus the GB250’s 4 hours, but the GB250 has more raw starting power. They weigh almost the same at around 15 pounds and both come with the 56W power adapter and EVA case.
How many starts can I get from the GB150 on a single charge?
NOCO says up to 80 starts per charge on engines within its range. In my testing with a 6.0L gas engine, I got over 60 jumps before needing to recharge. For heavy equipment that’s harder to crank, you’ll get fewer starts — but it’s still enough for a full day of work. The GB250 and GB251 don’t list a specific number of starts, but their larger battery capacity means they’ll last longer between charges.
Which NOCO jump starter is best for 24V equipment?
The GB251 is the only 24V model in this lineup — the GB150 and GB250 are both 12V units. I tested the GB251 on a 24V diesel generator and a military-style truck, and it fired both up immediately. It’s a niche tool, but if you need 24V power, it’s the one to get. Just remember it only has 3000A peak, so it’s less powerful on 12V systems than the GB250.
My Final Verdict
The NOCO Boost GB150 is my overall winner for most heavy equipment owners. It delivers 3000A peak at just 7.5 pounds with an IP65 rating, making it the most practical choice for farm tractors, diesel pickups, and RVs up to 7.0L diesel. The GB250 is the runner-up — its 5250A peak is essential for anyone working on 16L commercial trucks, but it’s nearly twice the weight and significantly pricier.
If you’re on the fence, ask yourself one question: what’s the biggest engine you’ll regularly jump? If it’s under 7.0L diesel, save your money and grab the GB150. If you’re dealing with Class 8 trucks or 24V military gear, stop hesitating and buy the GB250 or GB251 respectively — anything less will leave you stranded.
Winner: NOCO Boost GB150
- START DEAD BATTERIES — Instantly start dead batteries with 3000 amps of...
- ULTRASAFE TECHNOLOGY — Engineered with patented spark-proof and reverse...
- PORTABLE POWER BANK — Integrated power bank delivers emergency power to...
Best for anyone with 12V equipment up to 7.0L diesel who wants a lightweight, rugged jump starter. The 3000A peak and 7.5-pound design make it the most versatile choice.
Runner-Up: NOCO Boost Max GB250
- BOOST MAX SERIES — One of the most powerful lithium jump starters ever...
- ULTRASAFE TECHNOLOGY — Patented spark-proof and reverse polarity...
- COMMERCIAL-GRADE POWER — Starts nearly any engine - Class 8 trucks...
Best for commercial 12V equipment like Class 8 trucks and construction machinery up to 16L. The 5250A peak and 4-hour recharge are unbeatable for heavy-duty work.
Best for 24V Systems: NOCO Boost Max GB251
- BOOST MAX SERIES — One of the most powerful lithium jump starters ever...
- ULTRASAFE TECHNOLOGY — Patented spark-proof and reverse polarity...
- COMMERCIAL-GRADE POWER — Starts nearly any engine - Class 8 trucks...
Best for 24V military, industrial, or heavy equipment up to 32L. The 3000A peak and fastest 3-hour recharge make it the specialist pick for niche applications.
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