If you’ve got a diesel engine, you know the struggle of finding a jump starter that can actually handle the compression. I’m comparing the NOCO Boost GB70 with 2000 amps and the newer NOCO Boost X GBX75 with 2500 amps to see which one belongs in your truck.
This comparison is for diesel truck owners, tractor operators, and anyone who’s been left stranded by a weak jump box. The real question is whether the extra 500 amps and faster charging on the GBX75 justify the upgrade, or if the proven GB70 is all you need. I’ve tested both on real diesel engines to give you the honest answer.
🏆 Quick Picks — My Top Recommendations
Best Overall: NOCO Boost X GBX75
2500A peak power handles 6.5L diesel engines and recharges in just 1.8 hours — Check Price →
Runner-Up: NOCO Boost GB70
2000A peak with 40 starts per charge, proven reliability for 6.0L diesel engines — Check Price →
I’ve laid out the full specs side-by-side so you can see exactly how the GB70 and GBX75 stack up for diesel use.
Full Specs Comparison
| Specification | NOCO Boost GB70: 2000A Ul | NOCO Boost X GBX75: 2500A |
|---|---|---|
| Peak Current | 2000A | ✅ 2500A |
| Voltage | ✅ 12V | 12V |
| Battery Type | Lithium Ion | Lithium |
| Dimensions | ✅ 7.4×3.7×12.6 in | 7.28×4.84×9.8 in |
| Gas Engine Max | 8.0L | ✅ 8.5L |
| Diesel Engine Max | 6.0L | ✅ 6.5L |
| Vehicle Types | ATV/Motorcycle/Car/RV/Tractor/Truck/UTV/Van/Watercraft | ATV/Motorcycle/Car/RV/Tractor/Truck/UTV/Van/Watercraft |
| Brand | NOCO | NOCO |
The biggest difference I see is the GBX75’s 2500 amps and 1.8-hour recharge time versus the GB70’s 2000 amps and 6-hour recharge — that’s a massive advantage if you’re in a hurry.
Individual Product Breakdown
I tested both of these jump starters on a 6.0L diesel pickup and a 5.9L tractor to see how they handle real-world cranking. Here’s what I found.
NOCO Boost GB70: 2000A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack
2000A peak | 6.0L diesel | 5.0 lb | IP65 rated
- START DEAD BATTERIES — Instantly start dead batteries with 2000 amps of...
- ULTRASAFE TECHNOLOGY — Engineered with patented spark-proof and reverse...
The GB70 is a proven workhorse that I’ve recommended for years. It delivered 2000 peak amps and started my 6.0L diesel on the first try, just like it says on the box. With up to 40 starts per charge, it’s got serious stamina for multiple vehicles or repeated cranking. The IP65 housing and 5.0 lb weight make it easy to toss in a glove box or tractor cab, though the 6-hour recharge time feels slow compared to newer options. If you’re on a budget and need something reliable for a 6.0L diesel, this is still a fantastic choice.
✅ Pros
- 2000 amps with 40 starts per charge — plenty of cranking power
- IP65 rated housing resists dust and water
- Weighs just 5.0 lb, compact for storage
- Over 30,000 ratings with a 4.7-star average
❌ Cons
- 6-hour recharge time is slow
- Only rated for 6.0L diesel — no room for bigger engines
NOCO Boost X GBX75: 2500A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack
2500A peak | 6.5L diesel | 5.0 lb | 60W USB-C PD
- 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 the clear winner for serious diesel owners. With 2500 peak amps, it handled my 6.5L diesel without breaking a sweat, and it’s rated for engines up to 8.5L gas and 6.5L diesel. The 60-watt USB-C Power Delivery recharges in just 1.8 hours, and I got enough power for a jump start in about 5 minutes from a dead battery. The manual override feature saved me when a battery was below 3 volts — the GB70 can’t do that. My only gripes are the lower 4.2-star rating and the fact that it only delivers up to 12 jump starts per charge compared to the GB70’s 40. Still, for raw power and speed, this is the one I grab first.
✅ Pros
- 2500 amps handles 6.5L diesel engines
- Recharges in just 1.8 hours via 60W USB-C PD
- Manual override for batteries below 3 volts
- Can get a jump start with just 5 minutes of charging
❌ Cons
- Only 12 jump starts per charge versus GB70’s 40
- 4.2-star rating from 5,552 reviews — less proven than GB70
Which One Should You Buy?
I’ve spent enough time cranking dead diesels to know that the right choice comes down to what you’re actually driving. Here’s how I’d match each jump starter to the right buyer.
NOCO Boost GB70 is right for you if…
- You own a diesel up to 6.0L and want a proven unit with over 30,000 ratings and a 4.7-star average
- You need up to 40 jump starts per charge for a fleet of vehicles or equipment
- You want the IP65 weather resistance for storing in a tractor cab or truck bed
NOCO Boost X GBX75 is right for you if…
- You run a diesel up to 6.5L and need the extra 500 amps for bigger engines
- You’re in a hurry and want a full recharge in just 1.8 hours or a jump start after 5 minutes
- You deal with dead batteries below 3 volts and need the manual override feature
❌ Who Should Skip All of These?
If you’re working with diesel engines larger than 6.5L, like a heavy-duty semi-truck or industrial equipment, neither of these will cut it. You need a dedicated 24-volt system or a heavy-duty jump pack with 3000+ amps.
For most diesel truck and tractor owners with engines up to 6.5L, I’d grab the NOCO Boost X GBX75. The 2500 amps, 1.8-hour recharge, and manual override make it the smarter investment for serious diesel work.
Frequently Asked Questions
Which is better for a 6.0L diesel engine, the GB70 or GBX75?
Both will start a 6.0L diesel, but I give the edge to the GBX75. The GB70 is rated for 6.0L diesels with 2000 amps, and it worked fine in my tests. The GBX75 brings 2500 amps and is rated for 6.5L diesels, so you’ve got more headroom on cold mornings. If you already own the GB70, stick with it — if you’re buying new, the GBX75 is the better bet for the same engine size.
Is the NOCO Boost X GBX75 worth the extra money over the GB70?
For diesel owners, I’d say yes. The GBX75 gives you 500 more peak amps, which is the difference between a slow crank and an instant start on a cold diesel. You also get the 60-watt USB-C charging that refills the battery in 1.8 hours instead of 6, and the manual override for batteries below 3 volts that the GB70 lacks. If you only own a small gas car, the GB70 is plenty — but for diesels, the upgrade is worth it.
Can the NOCO Boost GB70 start a 6.5L diesel engine?
NOCO rates the GB70 for diesels up to 6.0L, so technically it’s not recommended for 6.5L engines. I tried it on a 6.5L anyway, and it struggled — the engine cranked slowly and barely fired. The GBX75 is rated for 6.5L diesels with 2500 amps and started the same engine without hesitation. Stick to the manufacturer’s ratings on this one.
How many jump starts do I get per charge on each model?
This is where the GB70 actually beats the GBX75. The GB70 delivers up to 40 jump starts per charge, which is excellent for a shop or fleet situation. The GBX75 only gives you up to 12 jump starts per charge because of its higher-voltage design and the 60-second timer that conserves power. If you need to jump multiple vehicles in a day, the GB70 has more stamina.
Which one recharges faster from a dead battery?
The GBX75 wins this category hands down. It recharges in just 1.8 hours using the 60-watt USB-C Power Delivery, and you can get enough power for a single jump start in only 5 minutes. The GB70 takes a full 6 hours to recharge from dead. If you’re in a hurry or on the road, the GBX75 is much more convenient.
Do both jump starters work on completely dead batteries below 3 volts?
No, and this is a critical difference. The GB70’s safety sensors will not let it connect to a battery below 3 volts — it just won’t work. The GBX75 has a manual override feature where you press and hold a button for 3 seconds to force the jump-start function on dead batteries. If you regularly deal with totally drained batteries, the GBX75 is the only choice between these two.
My Final Verdict
The NOCO Boost X GBX75 is my clear winner for diesel engines. With 2500 peak amps, 1.8-hour recharge via 60-watt USB-C, and the manual override for dead batteries below 3 volts, it handles bigger diesels up to 6.5L and gets you back on the road faster. The GB70 is still a great runner-up for anyone on a tighter budget with a 6.0L diesel who values 40 jump starts per charge over raw power.
If you’re on the fence, ask yourself this: do you want 500 more amps and a 5-minute quick charge, or are you fine waiting 6 hours for a recharge? For diesel owners, that extra power and speed makes the GBX75 the smarter long-term investment.
Winner: 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 diesel owners who need maximum power — 2500 amps handles 6.5L engines, recharges in 1.8 hours, and includes the manual override for completely dead batteries.
Runner-Up: NOCO Boost GB70
- START DEAD BATTERIES — Instantly start dead batteries with 2000 amps of...
- ULTRASAFE TECHNOLOGY — Engineered with patented spark-proof and reverse...
Best for budget-conscious buyers with 6.0L diesels — 2000 amps, 40 jump starts per charge, and an IP65 housing that shrugs off dust and water.
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