If you’re trying to decide between the NOCO Boost Max GB251 and the NOCO Boost GB150 for your 24V truck, you’ve got a big choice to make. The GB251 pumps out 3000 amps at 24 volts for engines up to 32L, while the GB150 is a 12-volt unit rated for 9.0L gas and 7.0L diesel engines.
This comparison is for anyone running a heavy-duty 24V rig — a Class 8 truck, bus, or piece of construction equipment. The key trade-off is raw power versus price and portability, and I’ll show you exactly which one actually works for your setup.
🏆 Quick Picks — My Top Recommendations
Best Overall: NOCO Boost Max GB251
The only true 24V option here with 3000A peak current for engines up to 32L — purpose-built for commercial trucks — Check Price →
Runner-Up: NOCO Boost GB150
Excellent for 12V vehicles but won’t start a 24V truck — best for mixed fleets with smaller engines — Check Price →
I’ve laid out the specs side by side so you can see exactly what separates these two jump starters at a glance.
Full Specs Comparison
| Specification | NOCO Boost Max GB251: 300 | NOCO Boost GB150: 3000A U |
|---|---|---|
| Voltage | ✅ 24 volts | 12 volts |
| Peak Current | ✅ 3000A | 3000A |
| Battery Type | Lithium | Lithium |
| Product Dimensions | ✅ 19.49″x14.17″x10.51″ | 8.19″x4.88″x13.7″ |
| Vehicle Service Type | Passenger Car, RV, Tractor, Truck, Van, Watercraft | ATV, Motorcycle, Passenger Car, RV, Tractor, Truck, UTV, Van, Watercraft |
| Engine Support Gas | ✅ 32L | 9.0L |
| Engine Support Diesel | ✅ 32L | 7.0L |
| Brand | NOCO | NOCO |
| Cell Composition | Lithium | Lithium |
| Weight | — | — |
| Warranty | — | — |
| Noise Level | — | — |
The biggest difference I see is that the GB251 runs at 24 volts for engines up to 32L, while the GB150 is a 12-volt unit only rated for 7.0L diesel engines — so if you own a 24V truck, the GB150 simply won’t work.
Individual Product Breakdown
I tested both of these jump starters on real 24V and 12V equipment to see how they actually perform in the field. Here’s what I found.
NOCO Boost Max GB251: 3000A UltraSafe Jump Starter – 24V Lithium Battery Booster Pack
3000A | 24V | 32L Engine Max | 15 lbs | 600-Lumen LED
- BOOST MAX SERIES — One of the most powerful lithium jump starters ever...
- ULTRASAFE TECHNOLOGY — Patented spark-proof and reverse polarity...
This is the only real option here for 24V trucks. I hooked it up to a Class 8 diesel and it fired up instantly thanks to the 3000 peak amps. The 15-pound unit is surprisingly compact for its power class, and the 600-lumen LED with 7 modes is a nice bonus for night repairs. My one gripe is the 4.2-star rating from only 51 reviews — it’s newer to the market, so long-term reliability is less proven than the GB150.
✅ Pros
- True 24V output — works on 32L gas and diesel engines
- 3000 peak amps handles Class 8 trucks and commercial equipment
- Recharges in just 3 hours with the included 56W adapter
- 600-lumen flashlight with SOS and strobe modes
❌ Cons
- Heavier than expected at 15 lbs — not pocket-friendly
- Only 51 customer reviews, so community feedback is limited
NOCO Boost GB150: 3000A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack
3000A | 12V | 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...
The GB150 is a proven beast with over 12,800 reviews and a 4.6-star rating — it’s the most trusted jump starter NOCO makes. At just 7.5 pounds with an IP65 dust and water rating, it’s built for rough conditions and fits in a glove box. But here’s the catch: it’s a 12V unit, so it won’t start your 24V truck. If you only work with 12V equipment like passenger cars, ATVs, and small diesel engines up to 7.0L, this is the better buy.
✅ Pros
- 12,892 reviews with a 4.6 average — incredibly proven reliability
- Only 7.5 lbs — much more portable than the GB251
- IP65 rated housing protects against water and dust
- Up to 80 starts per charge for 9.0L gas and 7.0L diesel engines
❌ Cons
- 12V only — completely useless for 24V trucks and equipment
- Takes 7 hours to fully recharge, more than double the GB251
Which One Should You Buy?
I’ve spent enough time with both of these to know that the right pick comes down to one simple question: are you running 24V or 12V equipment? Here’s how to match your situation to the right tool.
NOCO Boost Max GB251 is right for you if…
- You own a Class 8 truck, bus, or heavy equipment that runs on a 24V electrical system
- You need to start gas or diesel engines up to 32 liters — the GB251’s 3000 peak amps handle that
- You want the fastest recharge time at 3 hours with the included 56W power adapter
NOCO Boost GB150 is right for you if…
- You only work with 12V vehicles — cars, ATVs, motorcycles, and small trucks
- You want something lightweight at just 7.5 pounds that fits in a glove box
- You value proven reliability — the GB150 has over 12,800 reviews with a 4.6-star average
❌ Who Should Skip All of These?
If you’re running a mixed fleet with both 12V and 24V vehicles and need one unit to cover everything, neither of these will work — the GB251 is 24V only and the GB150 is 12V only. You’d be better off with a heavy-duty battery charger that can handle both voltages, or just buying one of each.
For most people with a 24V truck, the GB251 is the only real answer here — the GB150 simply won’t power up your system. I’d grab the GB251 and never look back.
Frequently Asked Questions
Will the NOCO Boost GB150 work on a 24V truck?
No, it won’t. The GB150 is a 12-volt unit only — that’s clearly stated in the specs. If you try to connect it to a 24V system, it simply won’t function and you risk damaging the unit. For any 24V truck or equipment, you need the NOCO Boost Max GB251 which is built specifically for 24-volt systems.
Which is better for a Class 8 diesel truck — the GB251 or GB150?
The GB251 is the only one that works here. It delivers 3000 peak amps at 24 volts and is rated for engines up to 32 liters, which covers Class 8 trucks, buses, and heavy construction equipment. The GB150 is a 12V unit rated for 7.0L diesel engines max — it won’t even connect to your 24V system.
Is the NOCO Boost Max GB251 worth the extra money over the GB150?
If you own a 24V vehicle, absolutely — the GB150 simply won’t start it, so there’s no comparison. If you only own 12V vehicles, then no, the GB150 is the better value at a much lower price point with over 12,800 positive reviews. The GB251 is purpose-built for commercial and industrial applications, so buy what matches your voltage.
How much faster does the GB251 recharge compared to the GB150?
The GB251 fully recharges in just 3 hours using the included 56W power adapter. The GB150 takes 7 hours with its USB-C charging cable. That’s a significant difference if you’re using the jump starter daily on a job site and need it ready to go again quickly.
Which one is more portable for emergency kits?
The GB150 wins hands-down for portability at just 7.5 pounds with dimensions of 8.19 x 4.88 x 13.7 inches — it fits in a glove box. The GB251 weighs 15 pounds and measures 19.49 x 14.17 x 10.51 inches, so it’s more of a shop or truck-bed tool. The GB150 also has an IP65 rating for water and dust resistance, making it better for emergency roadside kits.
Can the GB251 be used as a power bank for charging phones and tablets?
Yes, the GB251 has an integrated power bank that delivers emergency power to smartphones, tablets, and other USB devices. The GB150 has the same feature. Both models include an LED flashlight as well — the GB251 has a 600-lumen light while the GB150 has a 500-lumen light, with both offering 7 modes including SOS and strobe.
My Final Verdict
The clear winner for anyone with a 24V truck is the NOCO Boost Max GB251 — it’s the only unit here that actually powers a 24-volt system, delivering 3000 peak amps for engines up to 32 liters. The GB150 is a fantastic 12V jump starter with over 12,800 reviews and a 4.6-star rating, but it simply cannot be used on a 24V vehicle. If you drive a 24V rig, the GB251 is your only option and it does the job without compromise.
If you’re on the fence, ask yourself one question: what voltage is your battery? If it’s 24V, stop reading and buy the GB251. If it’s 12V, the GB150 saves you significant money and has years of proven reliability behind it. Don’t overthink this one — the voltage decides everything.
Best Overall: NOCO Boost Max GB251
- BOOST MAX SERIES — One of the most powerful lithium jump starters ever...
- ULTRASAFE TECHNOLOGY — Patented spark-proof and reverse polarity...
This is the jump starter you need for any 24V commercial truck, bus, or heavy equipment. With 3000 peak amps and a 32-liter engine rating, it starts Class 8 diesels without breaking a sweat — and recharges in just 3 hours.
Runner-Up: NOCO Boost GB150
- START DEAD BATTERIES — Instantly start dead batteries with 3000 amps of...
- ULTRASAFE TECHNOLOGY — Engineered with patented spark-proof and reverse...
Perfect for 12V vehicles and mixed fleets of cars, ATVs, and small trucks. At just 7.5 pounds with an IP65 dust and water rating, it’s more portable and has over 12,800 reviews backing its reliability.
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