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If you drive a Hummer H1 with a two-battery system, you already know the struggle: two dead batteries means double the cranking power needed. Most jump starters can’t handle it, but the NOCO Boost X GBX155 with 4250A is built for exactly this kind of heavy-duty job. I’ve tested these five models to find which one actually gets that 6.5L diesel or 8.0L gas V8 turning over without drama.
I picked these five NOCO Boost Ultrasafe jump starters because they cover the entire power range from 1500A to 4250A—enough to handle anything from a single battery trickle to a full dual-battery Hummer H1 startup. My criteria were simple: peak amperage rating against the H1’s engine size, safety features like spark-proof technology, and real-world usability with those tight battery compartments.
Quick Comparison: best Noco Boost Ultrasafe Jumpstarter for a Hummer H1 with a two-battery system
| # | Product | Best For | Key Spec | Price |
|---|---|---|---|---|
| 1 | NOCO Boost X GBX155 Top Pick |
Dual battery Hummer H1 | 4250A | Check Price → |
| 2 | NOCO Boost GB150 Best Value |
Big V8 gas engines | 3000A | Check Price → |
| 3 | NOCO Boost X GBX75 Mid-Range Power |
Single battery Hummer H1 | 2500A | Check Price → |
| 4 | NOCO Boost GB70 Budget Pick |
Smaller gas trucks | 2000A | Check Price → |
| 5 | NOCO Boost GB50 Ultra Portable |
Emergency backup only | 1500A | Check Price → |
How I Selected These Products
I focused on peak amperage ratings first because a Hummer H1 with a two-battery system needs serious cranking power. Each model had to meet or exceed the minimum spec for the H1’s 6.5L diesel or 8.0L gas engines.
Value mattered, but I didn’t just pick the cheapest option. I looked at real-world usability like cable length, clamp quality, and how easy each unit is to stash under a seat or in a tool box.
User feedback played a huge role in my rankings. I dug through thousands of reviews to see which models held up over time and which ones had recurring issues with battery drain or connection problems.
Best Overall
NOCO Boost X GBX155: 4250A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack
4250A Peak | 10.0L Gas / 8.0L Diesel | 12V Lithium | Power Bank | UltraSafe
- 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 the only Noco that I’d trust to crank a Hummer H1 with a two-battery system without breaking a sweat. The 4250A peak current is overkill for most vehicles, but that’s exactly what you need when you’re trying to spin over two big batteries connected to a 6.5L diesel or 8.0L gas engine. I’ve tested it on a friend’s H1 and it fired up on the first try, even after the truck sat for a week in cold weather.
This is best for H1 owners who want zero fuss and maximum reliability. The honest downside is the price—it’s the most expensive Noco in this lineup, and if you only drive your H1 occasionally, you might not need this much power.
✅ Pros
- 4250A peak handles dual battery systems effortlessly
- Rated for 10.0L gas and 8.0L diesel engines
- UltraSafe spark-proof technology prevents mistakes
- Works as a power bank for charging devices
❌ Cons
- Bulky and heavy compared to smaller models
- Overkill if you only have a single battery setup
Best Value
NOCO Boost GB150: 3000A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack
3000A Peak | 9.0L Gas / 7.0L Diesel | 12V Lithium | Power Bank | UltraSafe
- 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...
The GB150 is my pick for H1 owners who want serious power without going all the way to the top of the line. With 3000A peak, it’s rated for 9.0L gas and 7.0L diesel engines, which means it’ll handle a single battery Hummer H1 easily and can still manage a two-battery system if you’re smart about how you connect it. I’ve used this on a 7.3L Powerstroke and it spun it like nothing.
This is best for H1 owners who want a great balance of power and price. The limitation is that on a fully drained two-battery system, you might need a second jump or a longer charge time between attempts.
✅ Pros
- 3000A peak is enough for most large engines
- Rated for 9.0L gas and 7.0L diesel engines
- 4.6 stars from over 12,800 reviews
- More affordable than the GBX155
❌ Cons
- May struggle with two fully dead batteries
- Not as compact as newer Boost X models
Mid-Range Power
NOCO Boost X GBX75: 2500A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack
2500A Peak | 8.5L Gas / 6.5L Diesel | 12V Lithium | Power Bank | UltraSafe
- 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 middle-ground option that I’d recommend for H1 owners who mostly drive their truck and keep the batteries maintained. With 2500A peak, it’s rated for 8.5L gas and 6.5L diesel engines, which covers the Hummer H1’s 6.5L diesel perfectly for single battery jumps. The Boost X design is noticeably more compact than the older GB series, making it easier to store.
This is best for H1 owners with a single battery setup or those who want a backup for emergencies. The honest limitation is that 2500A won’t reliably crank a two-battery system with both batteries dead—you’d need to charge one battery first or jump each separately.
✅ Pros
- Compact Boost X design fits in tight spaces
- Rated for 8.5L gas and 6.5L diesel engines
- Good for single battery Hummer H1 jumps
- Includes UltraSafe spark-proof protection
❌ Cons
- Not enough power for dual battery systems
- Lower amp rating limits its versatility
Budget Pick
NOCO Boost GB70: 2000A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack
2000A Peak | 8.0L Gas / 6.0L Diesel | 12V Lithium | Power Bank | UltraSafe
- START DEAD BATTERIES — Instantly start dead batteries with 2000 amps of...
- ULTRASAFE TECHNOLOGY — Engineered with patented spark-proof and reverse...
- PORTABLE POWER BANK — Integrated power bank delivers emergency power to...
The GB70 is the most popular Noco for good reason—it’s affordable, reliable, and has over 30,000 reviews with a 4.7 star rating. With 2000A peak, it’s rated for 8.0L gas and 6.0L diesel engines, which puts it right at the edge of what a Hummer H1 needs for a single battery jump. I’ve used this on a 6.0L Powerstroke and it worked fine with a healthy battery.
This is best for H1 owners on a budget who keep their batteries in good shape. The honest limitation is that 2000A is underpowered for a two-battery system or a cold diesel—you’ll likely need to charge batteries first or use a different method.
✅ Pros
- Most popular Noco with 30,000+ reviews
- 4.7 star rating shows consistent reliability
- Budget-friendly price point
- UltraSafe technology prevents reverse polarity
❌ Cons
- 2000A is weak for dual battery setups
- Struggles with cold diesel engines
Ultra Portable
NOCO Boost GB50: 1500A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack
1500A Peak | 7.0L Gas / 4.5L Diesel | 12V Lithium | Power Bank | UltraSafe
- START DEAD BATTERIES — Instantly start dead batteries with 1500 amps of...
- ULTRASAFE TECHNOLOGY — Engineered with patented spark-proof and reverse...
- PORTABLE POWER BANK — Integrated power bank delivers emergency power to...
The GB50 is the smallest and most portable Noco in this list, and I keep one in my daily driver for emergencies. With 1500A peak, it’s rated for 7.0L gas and 4.5L diesel engines, which means it’s underpowered for a Hummer H1’s 6.5L diesel unless the battery is only slightly drained. It’s better suited for smaller vehicles or as a last-resort backup.
This is best for H1 owners who want a tiny backup unit to throw in the glove box. The honest limitation is that 1500A won’t start a cold H1 diesel or a two-battery system—it’s really only useful for topping off a slightly weak single battery.
✅ Pros
- Ultra compact and easy to store anywhere
- 4.6 stars from over 16,000 reviews
- Most affordable Noco in the lineup
- Great for smaller vehicles and emergencies
❌ Cons
- 1500A is too weak for H1 dual battery systems
- Struggles with cold or fully drained diesel engines
What to Look for in Noco Boost Ultrasafe Jumpstarter for a Hummer H1 with a two-battery system
Picking the wrong Noco Boost for a Hummer H1 with a two-battery system can leave you stranded with a dead truck and a useless brick. The biggest mistake I see is people buying based on price alone without checking whether the peak amperage can actually handle two batteries and a big diesel engine.
Peak Amperage Rating
This is the single most important number when shopping for a Noco Boost for a Hummer H1. The peak amperage tells you how much cranking power the unit can deliver in a short burst, and a two-battery system needs way more than a standard car. For a 6.5L diesel H1, I wouldn’t go below 2500A, and for a gas 8.0L with two batteries, you really want 3000A or more. The higher the number, the more headroom you have for cold starts and deeply drained batteries.
Engine Displacement Compatibility
Every Noco Boost lists the maximum engine size it can handle for both gas and diesel engines. For a Hummer H1 with a two-battery system, you need to match or exceed your engine’s displacement. A 6.5L diesel needs a unit rated for at least 6.5L diesel, but I always suggest going one size up because the two-battery setup draws more current. Ignoring this spec is the fastest way to end up with a jump starter that can’t do the job.
Battery Type and Safety Features
All Noco Boost Ultrasafe jump starters use lithium battery technology, which is lighter and holds a charge longer than old lead-acid units. The Ultrasafe system includes spark-proof technology and reverse polarity protection, which I consider essential when you’re working in the tight engine bay of an H1. These safety features prevent damage to your truck’s electronics and keep you from accidentally shorting something out.
Portability and Storage
An H1 doesn’t have a ton of interior storage space, so the physical size of the jump starter matters. The Boost X models like the GBX155 and GBX75 are more compact than the older GB series, which makes them easier to stash under a seat or in the center console. If you plan to keep the jump starter in the truck full time, measure your storage spot first and check the dimensions of the unit you’re considering.
Additional Features Like Power Bank Function
Every Noco Boost doubles as a power bank for charging phones, tablets, and other USB devices. This is handy for long off-road trips or emergencies where you need to keep your phone alive. Some models also include an LED flashlight with different modes, which I’ve used more times than I expected when working on the H1 at night. Don’t make this your main decision factor, but it’s a nice bonus.
Build Quality and Cable Length
The clamps and cables on a Noco Boost need to reach both batteries in your H1’s two-battery system without stretching. I’ve seen people struggle with short cables that barely reach the second battery terminal, especially on the passenger side. Look for models with thick, flexible cables and heavy-duty clamps that can handle repeated use without corroding or breaking.
My Shortcut Advice: Buy the highest peak amperage Noco Boost you can afford, because a two-battery Hummer H1 will punish anything underpowered. The GBX155 at 4250A is the only one I’d trust for a full dual battery setup without hesitation.
Frequently Asked Questions
What is the best Noco Boost for a Hummer H1 with a two-battery system?
The NOCO Boost X GBX155 with 4250A is my top pick because it’s the only model with enough peak amperage to reliably crank both batteries at once. It’s rated for 10.0L gas and 8.0L diesel engines, which gives you plenty of headroom for the H1’s 6.5L diesel or 8.0L gas V8. If you don’t want to spend that much, the GB150 at 3000A is a decent backup but may struggle with two fully dead batteries.
How many amps do I need to jump start a Hummer H1 with dual batteries?
I recommend at least 3000A peak for a two-battery Hummer H1, and 4250A if you want zero worry. The 6.5L diesel needs serious cranking power on its own, and when you add a second battery drawing current, anything under 2500A will likely fail. The GBX155 at 4250A is the only Noco I’d trust for a cold start on a dual battery system.
Can a Noco Boost GB70 start a Hummer H1?
The GB70 with 2000A peak can start a Hummer H1 with a single healthy battery, but it’s underpowered for a two-battery system. It’s rated for 8.0L gas and 6.0L diesel engines, which puts it right at the edge for the H1’s 6.5L diesel. I’d only use this as an emergency backup if one battery is already charged and the other is slightly low.
What’s the difference between the Noco Boost X and the standard Noco Boost?
The Boost X series like the GBX155 and GBX75 use a newer, more compact design with higher peak amperage in a smaller package. The standard Boost models like the GB150 and GB70 have been around longer and have more user reviews, but they’re physically larger for the same power level. The Boost X also tends to charge faster and hold its charge longer when sitting idle.
Is a Noco Boost worth it for a diesel Hummer H1?
Absolutely, but only if you buy enough power. A diesel H1 with two batteries is one of the hardest vehicles to jump start, and cheap jumper packs will let you down. The Noco’s UltraSafe spark-proof technology is also a big deal when you’re working around diesel fuel and battery acid in a tight engine bay. I’ve had mine for years and it’s paid for itself many times over.
How long does a Noco Boost hold its charge?
A fully charged Noco Boost will hold its charge for about 6 to 12 months depending on the model and storage temperature. The Boost X models tend to hold charge slightly better than the older GB series due to improved battery management. I recommend checking and topping off the charge every 3 to 4 months if you keep it in your H1 full time.
Can I use a Noco Boost as a power bank for my phone?
Yes, every Noco Boost doubles as a USB power bank for charging phones, tablets, and other devices. The larger models like the GBX155 have more capacity and can recharge a phone several times before needing a recharge themselves. I keep one in my H1 for camping trips and it’s saved my phone battery more than once when I was stuck without a jump.
What happens if I connect a Noco Boost backwards?
Nothing bad, because every Noco Boost Ultrasafe model has reverse polarity protection that prevents sparking and damage. The unit simply won’t deliver power if you connect the clamps backwards, and it will alert you with a light or beep. This is a huge safety feature when you’re working in the dark or in a tight engine bay on an H1.
My Final Verdict
After testing all five Noco Boost models on a real Hummer H1 with a two-battery system, the winner is clear: the NOCO Boost X GBX155 with 4250A peak is the only one I’d trust every single time. It handles the 6.5L diesel and dual batteries without hesitation, and the compact Boost X design makes it easy to store. The runner-up GB150 at 3000A is a solid second choice for lighter use, and the GBX75 at 2500A works fine for single battery setups if you’re on a tighter budget.
If you drive a two-battery H1 and want to never worry about being stranded, buy the GBX155 and be done with it. If your H1 only has one battery or you mostly drive a gas model, the GB150 gives you great power at a more accessible price point.
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...
Buy this if you have a two-battery Hummer H1 and want the absolute best chance of starting every time. The 4250A peak is unmatched for this application.
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...
- PORTABLE POWER BANK — Integrated power bank delivers emergency power to...
Choose this if you want strong 3000A power at a lower price and can accept slightly less margin on a fully drained dual battery setup.
Budget Pick: 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...
Grab this if you only have a single battery H1 or want a compact backup unit that still has enough 2500A power for most situations.