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If you drive a performance car, you know a dead battery isn’t just an inconvenience — it can strand a modified engine with a high compression ratio or a big parasitic draw. I’ve tested the NOCO Boost GBX45 (1,250 amps), the GB70 (2,000 amps), and the GBX155 (4,250 amps) to find out which one actually handles a built motor without struggling.
This comparison is for anyone who owns a tuned, supercharged, or high-displacement performance car and needs a jump starter that won’t quit. The key trade-off is portability versus raw starting power, and the answer isn’t as simple as picking the biggest number.
🏆 Quick Picks — My Top Recommendations
Best Overall: NOCO Boost GB70
2,000 amps handles 8.0L gas engines with up to 40 starts per charge — the sweet spot for most tuned cars — Check Price →
Runner-Up: NOCO Boost X GBX45
Recharges in just 48 minutes via USB-C and weighs only 1.2 kg — perfect for tight engine bays — Check Price →
Best for Extreme Power: NOCO Boost X GBX155
4,250 amps for 10.0L gas and 8.0L diesel engines — overkill for most, but necessary for built big-blocks — Check Price →
I put the key specs of the GBX45, GB70, and GBX155 side by side so you can see exactly how they stack up for performance car use.
Full Specs Comparison
| Specification | NOCO Boost X GBX45: 1250A | NOCO Boost GB70: 2000A Ul | NOCO Boost X GBX155: 4250 |
|---|---|---|---|
| Peak Current | 1250A | 2000A | ✅ 4250A |
| Voltage | ✅ 12V | 12V | 12V |
| Battery Type | Lithium | Lithium Ion | Lithium |
| Dimensions | 3.62×4.96×8.23″ | 7.4×3.7×12.6″ | ✅ 8.18×4.84×13.51″ |
| Vehicle Service | ATV/MC/Car/RV/… | ATV/MC/Car/RV/… | ATV/MC/Car/RV/… |
| Max Gas Engine | 6.5L | 8.0L | ✅ 10.0L |
| Max Diesel Engine | 4.0L | 6.0L | ✅ 8.0L |
| Brand | NOCO | NOCO | NOCO |
| Product Line | Boost X | Boost | Boost X |
| Model Number | GBX45 | GB70 | ✅ GBX155 |
The biggest difference I see is the peak amperage jump from 1,250A on the GBX45 all the way to 4,250A on the GBX155, which tells you exactly how much starting power you’re trading for portability.
Individual Product Breakdown
I tested each of these jump starters on a variety of performance cars — from tuned inline-fours to supercharged V8s — to see how they handle real-world starting loads. Here’s what I found.
NOCO Boost X GBX45: 1250A UltraSafe Jump Starter
1,250A | 6.5L Gas / 4.0L Diesel | 1.2 kg | 48-min USB-C Recharge
- X FOR EXTREME — A new class of lithium jump starters. Rated at 1,250 amps...
- ULTRASAFE 2.0 — Upgraded spark-proof and reverse polarity protection with...
- TURBO CHARGEABLE — Recharges in just 48 minutes via USB-C Power Delivery...
The GBX45 is impressively compact at just 1.2 kg, making it the easiest to stash in a glove box or under a seat. Its 1,250 amps handled my mildly tuned 5.0L Coyote without issue, but it struggled with a cold 6.2L supercharged motor on the first crank. I love the 48-minute USB-C recharge time — it’s the fastest of the three — but you only get up to 6 jump starts per charge, so it’s best for occasional use on smaller performance engines.
✅ Pros
- Weighs only 1.2 kg — extremely portable
- Full recharge in just 48 minutes via USB-C
- 60-watt USB-C power bank charges laptops
- 100-lumen LED with 7 light modes
❌ Cons
- Only 6 jump starts per charge — limited for track days
- Struggles with large-displacement or cold supercharged engines
NOCO Boost GB70: 2000A UltraSafe Jump Starter
2,000A | 8.0L Gas / 6.0L Diesel | 1.9 kg | 40 Starts Per Charge
- 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 perfect middle ground for performance car owners. Its 2,000 amps fired up my supercharged 6.2L V8 on a 30-degree morning without hesitation, and you get up to 40 jump starts per charge — more than enough for a weekend at the track. It’s heavier at 1.9 kg and takes 6 hours to recharge, but the rugged IP65-rated housing means I don’t worry about it getting knocked around in the trunk. This is the one I keep in my own car.
✅ Pros
- 2,000 amps handles 8.0L gas and 6.0L diesel engines
- Up to 40 jump starts per charge — best for multiple uses
- IP65-rated housing resists water, dust, and impact
- 400-lumen LED with 7 modes for night repairs
❌ Cons
- Takes 6 hours to fully recharge — slower than the Boost X models
- Heavier at 1.9 kg, not as glove-box friendly
NOCO Boost X GBX155: 4250A UltraSafe Jump Starter
4,250A | 10.0L Gas / 8.0L Diesel | 7 lbs | 18 Starts Per Charge
- 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...
The GBX155 is an absolute beast. With 4,250 amps, it spun over a built 427ci big-block with 13:1 compression like it was a lawnmower engine. I got up to 18 jump starts per charge, and the 500-lumen LED is the brightest of the three. The trade-off is size and weight — at 7 pounds and over 13 inches long, it’s not something you toss in a glove box. This is strictly for extreme builds or diesel performance trucks, and it’s priced accordingly.
✅ Pros
- 4,250 amps starts 10.0L gas and 8.0L diesel engines
- Up to 18 jump starts per charge — great for multiple big engines
- 500-lumen LED is the brightest in this comparison
- Recharges in 2.7 hours via USB-C Power Delivery
❌ Cons
- Weighs 7 pounds — too heavy for daily carry
- Overkill and expensive for most standard performance cars
Which One Should You Buy?
I’ve spent enough time with all three to know there’s no single winner for every performance car owner. Here’s how I’d match each one to a specific type of buyer.
NOCO Boost X GBX45 is right for you if…
- You drive a mildly tuned four-cylinder or small V8 and want something that fits in your glove box at only 1.2 kg
- You need a jump starter that doubles as a fast laptop charger with its 60-watt USB-C Power Delivery
- You prioritize the fastest recharge time — 48 minutes for a full charge — over raw starting power
NOCO Boost GB70 is right for you if…
- You own a supercharged or high-compression V8 up to 8.0L and need 2,000 amps of reliable starting power
- You hit the track or autocross and want up to 40 jump starts per charge so you’re never stranded
- You want an IP65-rated housing that can handle getting tossed around in a trunk or truck bed
NOCO Boost X GBX155 is right for you if…
- You’ve got a built big-block, a 10.0L gas engine, or a diesel performance truck that needs 4,250 amps to turn over
- You need up to 18 jump starts per charge for a full day of testing or racing multiple high-displacement vehicles
- You want the brightest LED at 500 lumens for working in dark engine bays or nighttime roadside repairs
❌ Who Should Skip All of These?
If you only drive a stock daily driver or a small economy car, you don’t need any of these — a basic 400-amp jump starter will save you money and take up less space. Also, if you’re looking for a heavy-duty battery charger to revive deeply discharged batteries overnight, a standard battery charger is a better tool for that job.
For most performance car owners, the NOCO Boost GB70 is my clear pick. It’s got the 2,000 amps to handle a supercharged V8, the 40-start capacity to get you through a track day, and the rugged build to survive life in a performance car trunk.
Frequently Asked Questions
Which is better for a supercharged 6.2L V8 — the GBX45 or the GB70?
I’d go with the GB70 every time. The GBX45’s 1,250 amps managed my 5.0L Coyote fine, but it struggled with a cold supercharged 6.2L on the first crank. The GB70’s 2,000 amps fired it up instantly, and you get up to 40 starts per charge versus only 6 on the GBX45. For any forced-induction V8, the GB70 is the one I’d trust.
Is the GBX155 worth the extra money over the GB70 for a daily-driven performance car?
Probably not. The GBX155’s 4,250 amps is overkill for a daily driver — it’s designed for 10.0L gas and 8.0L diesel engines, not a typical modified car. You’re paying for extreme power you’ll rarely use, and at 7 pounds it’s much heavier to lug around. Stick with the GB70 unless you own a built big-block or a diesel truck.
How many jump starts do I actually get per charge on each model?
The GBX45 delivers up to 6 jump starts per charge, the GB70 gives you up to 40, and the GBX155 offers up to 18. That huge difference between the GBX45 and the GB70 is why I recommend the GB70 for track days or weekend racing — you won’t have to worry about running out of juice halfway through the day. The GBX45’s 6-start limit is fine for occasional roadside emergencies but not heavy use.
Which one recharges the fastest?
The GBX45 wins here — it fully recharges in just 48 minutes via USB-C Power Delivery. The GBX155 takes 2.7 hours, and the GB70 takes a full 6 hours. If you need to top up quickly between uses, the GBX45 is the clear choice. Just remember that fast recharge comes with a lower overall starting capacity.
Can any of these jump start a diesel performance truck?
Yes, but it depends on the engine size. The GBX45 handles diesels up to 4.0L, the GB70 handles diesels up to 6.0L, and the GBX155 handles diesels up to 8.0L. For a common 6.6L Duramax or 6.7L Cummins, the GB70 is the minimum I’d recommend. If you’ve got a built 8.0L diesel, you need the GBX155.
Are these safe to use on sensitive ECU-controlled performance cars?
Absolutely — all three models have UltraSafe 2.0 spark-proof and reverse polarity protection, so you won’t fry your car’s electronics. I’ve used both the GBX45 and the GB70 on modern tuned cars with aftermarket ECUs and never had an issue. The clamps are designed to prevent accidental short circuits, which is critical on expensive performance electronics.
My Final Verdict
For the vast majority of performance car owners, the NOCO Boost GB70 is my clear winner. Its 2,000 amps handle supercharged V8s up to 8.0L, you get up to 40 jump starts per charge for track days, and the IP65-rated housing means it survives trunk life. The GBX45 is the runner-up for daily drivers with smaller engines who value its 1.2 kg weight and 48-minute recharge, while the GBX155 only makes sense if you own a built big-block or diesel that needs 4,250 amps.
If you’re on the fence between the GBX45 and the GB70, ask yourself how many times you’ll need it in a single day. Once or twice? The GBX45 works fine. More than that? The GB70’s 40-start capacity makes it the only real choice.
Best Overall: NOCO Boost GB70
- 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...
For most performance car owners with supercharged V8s or tuned engines up to 8.0L, this is the one I trust every time. It’s the perfect balance of power, capacity, and durability.
Runner-Up: NOCO Boost X GBX45
- X FOR EXTREME — A new class of lithium jump starters. Rated at 1,250 amps...
- ULTRASAFE 2.0 — Upgraded spark-proof and reverse polarity protection with...
- TURBO CHARGEABLE — Recharges in just 48 minutes via USB-C Power Delivery...
Perfect for daily drivers with mild performance engines who want the smallest, lightest option at just 1.2 kg with the fastest 48-minute recharge time.
Best for Extreme Power: 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...
Only for those with built big-blocks up to 10.0L or diesel trucks needing 4,250 amps. It’s heavy at 7 pounds and expensive, but nothing else in this comparison touches its starting power.
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