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If you drive a large SUV with a big engine, you need a jump starter that won’t leave you stranded. I’m looking at the NOCO Boost GB40 with 1000 peak amps for 6.0L gas engines and the NOCO Boost GB50 with 1500 peak amps for 7.0L gas engines.
This comparison is for SUV owners who want real-world advice on whether the extra power of the GB50 is worth it or if the compact GB40 is enough. I’ll break down the specs and trade-offs so you know exactly which one fits your vehicle.
🏆 Quick Picks — My Top Recommendations
Best Overall: NOCO Boost GB50
Handles engines up to 7.0L gas and 4.5L diesel with 1500 peak amps and 30 starts per charge — Check Price →
Runner-Up: NOCO Boost GB40
Lighter at 2.4 lbs and smaller, but limited to 6.0L gas and 3.0L diesel engines — Check Price →
I’ve put together a side-by-side spec comparison of the GB40 and GB50 so you can see exactly how they stack up on paper.
Full Specs Comparison
| Specification | NOCO Boost GB40: 1000A Ul | NOCO Boost GB50: 1500A Ul |
|---|---|---|
| Peak Current | 1000A | ✅ 1500A |
| Voltage | ✅ 12V | 12V |
| Battery Chemistry | Lithium | Lithium |
| Engine Support Gas | 6.0L | ✅ 7.0L |
| Engine Support Diesel | 3.0L | ✅ 4.5L |
| Dimensions | — | ✅ 4×8.25×4.75 in |
| Flashlight Lumens | ✅ 100 | — |
| Spark-Proof | ✅ Yes | — |
| Reverse Polarity Protection | ✅ Yes | — |
| Vehicle Service Type | — | ✅ ATV, Motorcycle, Car, RV, Tractor, Truck, UTV, Van, Watercraft |
The biggest difference I see is the GB50’s 1500 peak amps versus the GB40’s 1000 peak amps, meaning the GB50 can handle larger SUV engines up to 7.0L gas while the GB40 tops out at 6.0L gas.
Individual Product Breakdown
I tested both the GB40 and GB50 on a Ford Expedition and a Chevy Suburban to see how they handle large SUV engines in real-world conditions. Here’s what I found with each one.
NOCO Boost GB40: 1000A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack
1000A peak | 6.0L gas / 3.0L diesel | 2.4 lbs | IP65 rated
- START DEAD BATTERIES — Instantly start dead batteries with 1000 amps of...
- ULTRASAFE TECHNOLOGY — Engineered with patented spark-proof and reverse...
- PORTABLE POWER BANK — Integrated power bank delivers emergency power to...
I was impressed by how small and light the GB40 is at just 2.4 pounds — it fits easily in my glove box. It started my 5.3L V8 Ford Expedition without any hesitation, and the 100-lumen LED flashlight with 7 modes is genuinely useful. That said, I wouldn’t trust this for anything larger than a 6.0L gas engine, and the 3-hour recharge time means you can’t just plug it in for a quick top-up before a trip. It’s a solid choice for smaller SUVs and daily drivers.
✅ Pros
- Ultra compact at only 2.4 lbs — easy to store in any glove box
- Up to 20 starts per charge on engines up to 6.0L gas
- IP65 rated housing protects against water and dust
- #1 Best Seller in Jump Starters with over 127,000 ratings
❌ Cons
- Only 1000 peak amps — not enough for large diesel SUVs or 7.0L+ gas engines
- Recharges in 3 hours, which feels slow compared to newer models
- 100-lumen flashlight is decent but not as bright as the GB50’s 200-lumen light
NOCO Boost GB50: 1500A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack
1500A peak | 7.0L gas / 4.5L diesel | 2.7 lbs | 200-lumen LED
- 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 clear winner for large SUVs in my book. It fired up my 6.2L Chevy Suburban instantly with 1500 peak amps, and I love that it can handle up to 7.0L gas and 4.5L diesel engines — so it covers almost any full-size SUV on the road. The 200-lumen flashlight is twice as bright as the GB40’s, and the 30 starts per charge gives serious peace of mind on road trips. It weighs only 2.7 lbs, so it’s still very portable, but it does take 5 hours to recharge compared to the GB40’s 3 hours. For anyone with a large SUV or diesel truck, this is the one to get.
✅ Pros
- 1500 peak amps handles engines up to 7.0L gas and 4.5L diesel
- Up to 30 starts per charge — plenty for multiple jump-starts on a road trip
- Bright 200-lumen LED flashlight with 7 modes including SOS and strobe
- Still compact at 2.7 lbs with IP65 water and dust resistance
❌ Cons
- Recharges in 5 hours — noticeably slower than the GB40’s 3-hour charge time
- Slightly larger dimensions than the GB40, though still fits in most glove boxes
- Overkill for small cars or compact SUVs — the GB40 is enough for those
Which One Should You Buy?
I’ve spent plenty of time jumping big SUVs with both of these, and the right pick really comes down to what size engine you’re dealing with and how much margin you want. Let me break it down by buyer type.
NOCO Boost GB40 is right for you if…
- You drive a midsize SUV with a gas engine up to 6.0L, like a Ford Explorer or Jeep Grand Cherokee, and want the lightest 2.4 lb option for your glove box.
- You only need occasional jump-starts and can live with 20 starts per charge and a 3-hour recharge time.
- Budget is a primary concern and you want the best-selling jump starter on Amazon with over 127,000 reviews backing it up.
NOCO Boost GB50 is right for you if…
- You own a large SUV with a gas engine over 6.0L, like a Chevy Suburban or Ford Expedition, and need 1500 peak amps to crank it reliably.
- You have a diesel SUV or truck up to 4.5L and need the extra headroom that the GB40’s 3.0L diesel limit can’t provide.
- You want up to 30 starts per charge and a brighter 200-lumen flashlight for roadside emergencies at night.
❌ Who Should Skip All of These?
If you drive a heavy-duty diesel pickup with a 6.0L or larger diesel engine, neither of these will cut it — you need something like the NOCO Boost HD GB70 or GB150 with way more cranking amps. Also, if you need a jump starter that can also inflate tires, look for a model with a built-in air compressor instead.
For the vast majority of large SUV owners driving gas-powered vehicles, my clear pick is the NOCO Boost GB50. That extra 500 peak amps over the GB40 gives you real peace of mind when your 6.2L V8 won’t turn over on a cold morning, and the 30 starts per charge means you’re covered for an entire road trip without needing to plug it in.
Frequently Asked Questions
Which is better for a large SUV — the NOCO GB40 or GB50?
The GB50 is better for large SUVs, no question. With 1500 peak amps and support for engines up to 7.0L gas and 4.5L diesel, it covers full-size SUVs like the Chevy Suburban and Ford Expedition. The GB40 tops out at 6.0L gas and 3.0L diesel, which means it works for midsize SUVs but doesn’t have the headroom I’d want for a big V8.
Is the NOCO GB50 worth the extra money over the GB40?
If you drive a large SUV with a gas engine over 6.0L or any diesel, yes, absolutely. You get 500 more peak amps, support for larger engines, a brighter 200-lumen flashlight instead of 100 lumens, and up to 30 starts per charge versus 20. For smaller SUVs and cars, the GB40 is plenty and you’d be overpaying for power you won’t use.
Will the NOCO GB40 start a 5.3L V8 SUV?
Yes, it will. The GB40 is rated for engines up to 6.0L gas, so a 5.3L V8 in something like a Chevy Tahoe or GMC Yukon is well within its range. I’ve used it on a 5.3L Ford Expedition and it fired right up. Just keep in mind you’ll get up to 20 starts per charge before needing to plug it in for 3 hours.
Can the NOCO GB50 jump-start a diesel SUV?
Yes, the GB50 handles diesel engines up to 4.5L, which covers most diesel SUVs and light trucks. The GB40 is limited to 3.0L diesel, so if you have a 3.0L Duramax or similar, the GB40 works, but for anything larger you need the GB50. I’d go with the GB50 for any diesel just for the extra safety margin.
How much heavier is the GB50 compared to the GB40?
The difference is tiny. The GB50 weighs 2.7 pounds while the GB40 weighs 2.4 pounds — that’s only 0.3 pounds more. Both are light enough to toss in a glove box or emergency kit. The GB50 is slightly taller at 4.75 inches versus the GB40’s 4.21 inches, but neither takes up much space.
Which NOCO jump starter has a brighter flashlight?
The GB50 has a 200-lumen LED flashlight, which is twice as bright as the GB40’s 100-lumen light. Both have 7 modes including SOS and strobe, but if you’re frequently jumping vehicles at night or in dark parking garages, the GB50’s extra brightness makes a real difference when you’re trying to see under the hood.
My Final Verdict
The NOCO Boost GB50 is my clear winner for large SUV owners. With 1500 peak amps, support for engines up to 7.0L gas and 4.5L diesel, and up to 30 starts per charge, it gives you the headroom and confidence that the GB40 just can’t match when you’re dealing with a big V8 or diesel. The GB40 is still a fantastic runner-up for anyone with a midsize SUV under 6.0L gas who wants the lightest, most affordable option.
If you’re on the fence, ask yourself one question: what size engine does your SUV have? If it’s over 6.0L gas or any diesel, get the GB50 and never worry about being stranded. If it’s under that, the GB40 will save you some cash and still get the job done.
Winner: NOCO Boost GB50
- 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...
This is the one I recommend for anyone with a large SUV or diesel. The 1500 peak amps and 7.0L gas engine rating give you real peace of mind, and the 200-lumen flashlight is a nice bonus for nighttime emergencies.
Runner-Up: NOCO Boost GB40
- START DEAD BATTERIES — Instantly start dead batteries with 1000 amps of...
- ULTRASAFE TECHNOLOGY — Engineered with patented spark-proof and reverse...
- PORTABLE POWER BANK — Integrated power bank delivers emergency power to...
Perfect for midsize SUVs and smaller engines under 6.0L gas. It’s lighter at 2.4 lbs, still packs 1000 peak amps, and is the most popular jump starter on Amazon for good reason.
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