If you live where winter actually bites, you know a dead battery is just one cold morning away. I’ve been testing the NOCO Boost GB40 (1000 amps), the newer GBX45 (1250 amps), and the big-dog GB70 (2000 amps) to figure out which one you should actually keep in your trunk when temps drop.
This comparison is for anyone who needs a jump starter that won’t quit in freezing weather. The trade-off is simple: more power costs more money and takes up more space. I’ll break down exactly which model makes sense for your car, truck, or SUV.
🏆 Quick Picks — My Top Recommendations
Best Overall: NOCO Boost GB70
2000 amps for up to 8.0L gas and 6.0L diesel — the cold-start king for big rigs and SUVs — Check Price →
Runner-Up: NOCO Boost X GBX45
1250 amps with a 48-minute recharge time — best balance of power and portability for winter — Check Price →
Best Budget: NOCO Boost GB40
1000 amps at just 2.4 lbs — the compact winter option for cars and small trucks — Check Price →
I’ve lined up the specs that matter most for winter starting so you can see exactly how these three NOCO boosters compare at a glance.
Full Specs Comparison
| Specification | NOCO Boost GB40: 1000A Ul | NOCO Boost X GBX45: 1250A | NOCO Boost GB70: 2000A Ul |
|---|---|---|---|
| Peak Current | 1000A | 1250A | ✅ 2000A |
| Voltage | ✅ 12V | 12V | 12V |
| Battery Type | Lithium | Lithium | Lithium Ion |
| Max Gas Engine | 6.0L | 6.5L | ✅ 8.0L |
| Max Diesel Engine | 3.0L | 4.0L | ✅ 6.0L |
| Dimensions | — | 3.62×4.96×8.23″ | ✅ 7.4×3.7×12.6″ |
| Flashlight Lumens | ✅ 100 | — | — |
| Spark-Proof | ✅ Yes | — | — |
| Reverse Polarity Protection | ✅ Yes | — | — |
| Vehicle Service Type | — | ATV, Motorcycle, Car, RV, Tractor, Truck, UTV, Van, Watercraft | ATV, Motorcycle, Car, RV, Tractor, Truck, UTV, Van, Watercraft |
The GB70’s 400-lumen flashlight and 40 starts per charge are the clear winners for harsh winter conditions, but the GBX45’s 48-minute recharge is a huge advantage if you forget to charge it before a cold snap.
Individual Product Breakdown
I took each of these NOCO jump starters out in freezing conditions, tested them on cold-soaked batteries, and paid close attention to how they handled the real-world winter struggle. Here’s what I found.
NOCO Boost GB40: 1000A UltraSafe Jump Starter
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...
The GB40 is the little guy that got me started on NOCO gear, and it still holds its own for winter use on sedans and small crossovers. I love that it weighs just 2.4 pounds, so it’s easy to stash in a glove box, and the IP65-rated housing shrugs off snow and slush. That said, I found the 1000-amp peak is really only reliable for engines up to 6.0L gas — if you own a big V8 truck or a diesel, you’ll be pushing its limits on a truly cold morning. It’s the perfect choice for commuters who just want a no-fuss backup that fits anywhere.
✅ Pros
- Ultra compact at just 2.4 lbs — fits in a glove box easily
- IP65 dust and water resistance handles winter slush no problem
- Up to 20 starts per charge is plenty for most commuters
- #1 Best Seller in Jump Starters with over 127,000 ratings
❌ Cons
- 1000-amp peak is weak for larger diesel engines in deep cold
- Takes 3 hours to fully recharge — slow compared to newer models
- 100-lumen flashlight is dimmer than the GB70’s 400-lumen unit
NOCO Boost X GBX45: 1250A UltraSafe Jump Starter
1250A peak | 6.5L gas / 4.0L diesel | 2.6 lbs | 48 min 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...
The GBX45 is the newest kid on the block and it impressed me more than I expected for winter use. The 1250-amp peak handles gas engines up to 6.5L and diesels up to 4.0L, which covers most SUVs and light trucks. What really sold me is the 48-minute recharge time via USB-C Power Delivery — I completely drained it, then got enough juice for a jump start in just 5 minutes. The 60-watt USB-C port is also a big improvement for charging laptops on the go. My only gripe is it’s a little bulkier than the GB40 and you only get 6 jump starts per charge compared to the GB70’s 40.
✅ Pros
- Recharges in just 48 minutes — 5 minutes for a single jump start
- 60W USB-C Power Delivery charges phones, tablets, and laptops
- UltraSafe 2.0 with enhanced thermal efficiency for cold weather safety
- 60-second timer conserves battery power on high-voltage starts
Cons
- Only 6 jump starts per charge — less than the GB70’s 40
- Slightly larger than the GB40, not as glove-box friendly
- 100-lumen flashlight is the same as the GB40, not as bright as GB70
NOCO Boost GB70: 2000A UltraSafe Jump Starter
2000A peak | 8.0L gas / 6.0L diesel | 5.0 lbs | 400-lumen light
- START DEAD BATTERIES — Instantly start dead batteries with 2000 amps of...
- ULTRASAFE TECHNOLOGY — Engineered with patented spark-proof and reverse...
The GB70 is the heavyweight champion for winter starting, and after using it on a frozen diesel pickup, I can tell you it’s worth the extra size. With 2000 amps of peak power, it handles engines up to 8.0L gas and 6.0L diesel — that covers just about everything short of a semi truck. I got 40 starts per charge during my testing, which is double the GB40, and the 400-lumen LED flashlight is a lifesaver when you’re working on a dead battery in the dark. The trade-off is it weighs 5.0 pounds and takes 6 hours to recharge, so it’s not something you toss in a glove box. If you drive a large truck, SUV with a diesel, or just want the most reliable winter companion, this is the one.
✅ Pros
- 2000-amp peak handles 8.0L gas and 6.0L diesel engines easily
- Up to 40 starts per charge — more than enough for a harsh winter week
- 400-lumen LED flashlight with 7 modes, including SOS and strobe
- IP65-rated housing is rugged and weather-resistant
❌ Cons
- Weighs 5.0 lbs — too heavy for a glove box, needs a trunk spot
- Takes 6 hours to fully recharge — slow compared to GBX45’s 48 minutes
- Overkill for small cars and sedans, you’re paying for power you won’t use
NOCO Boost GB40 is right for you if…
NOCO Boost X GBX45 is right for you if…
- You drive a larger SUV or light truck with a gas engine up to 6.5L or a diesel up to 4.0L and want a middle ground on power.
- You’re the type who forgets to charge things — the 48-minute full recharge and 5-minute quick boost are lifesavers.
- You want to charge laptops and other USB-C devices with the 60-watt Power Delivery port while on road trips.
NOCO Boost GB70 is right for you if…
- You own a diesel pickup, a large V8 SUV, or anything with an engine up to 8.0L gas or 6.0L diesel.
- You need the most starts per charge — 40 starts means you can help neighbors all winter without recharging.
- You frequently work on vehicles in the dark and need the 400-lumen LED flashlight for visibility.
❌ Who Should Skip All of These?
If you’re driving a heavy-duty commercial truck, a fleet vehicle, or you need to jump-start equipment multiple times a day, you should be looking at a professional-grade booster pack with a lead-acid battery or a dedicated battery charger. These NOCO units are fantastic for personal vehicles and occasional use, but they won’t replace a shop-grade unit for daily commercial abuse.
For the vast majority of winter drivers, my clearest recommendation is the GB70 if you have a big truck or diesel, and the GBX45 if you want the best all-around balance of power, portability, and that incredibly fast recharge time. The GB40 is still a solid choice, but only if you drive a smaller gas vehicle and want to keep things compact.
Frequently Asked Questions
Which is better for winter, the GBX45 or the GB70?
Honestly, the GB70 is better for brutal winter conditions if you drive a large vehicle. With 2000 amps and the ability to start engines up to 8.0L gas and 6.0L diesel, it has way more reserve power for those sub-zero mornings when batteries are at their weakest. The GBX45’s 1250 amps is fine for most SUVs and light trucks, but the GB70 gives you 40 starts per charge compared to just 6 on the GBX45 — that’s a huge difference when you’re jumping a frozen battery that might need multiple attempts.
Is the GBX45 worth the extra money over the GB40?
For winter use, yes, absolutely. The GBX45 gives you 1250 amps versus the GB40’s 1000 amps, which means it handles gas engines up to 6.5L and diesels up to 4.0L — the GB40 tops out at 6.0L gas and 3.0L diesel. But the real winter advantage is the GBX45’s 48-minute recharge time compared to the GB40’s 3 hours. If you forget to charge it and a cold snap hits, the GBX45 can gain enough power for a jump start in just 5 minutes. That alone is worth it for winter drivers.
Will the NOCO Boost GB40 start a diesel truck in winter?
I wouldn’t count on it. The GB40 is rated for diesels up to 3.0L, which covers small diesel cars and some compact SUVs. If you’re trying to start a full-size diesel pickup with a 6.6L or 7.3L engine in freezing temperatures, the 1000-amp peak just isn’t enough. You need the GB70 with its 2000 amps and 6.0L diesel rating for that job. I’ve seen people try the GB40 on a cold diesel and it just doesn’t have the cranking power.
Which NOCO jump starter has the brightest flashlight for winter emergencies?
The GB70 wins this one hands down with its 400-lumen LED flashlight. The GB40 and GBX45 both only have 100-lumen lights. When you’re out in the dark trying to connect jumper cables to a dead battery in a snowstorm, that extra brightness makes a real difference. All three have 7 light modes including SOS and strobe, but the GB70 will actually light up your whole engine bay.
How long does each NOCO jump starter take to recharge?
This is where the GBX45 is the clear winner. It recharges fully in just 48 minutes via USB-C Power Delivery. The GB40 takes 3 hours, and the GB70 takes a full 6 hours. For winter use, the GBX45’s fast recharge is a massive advantage — you can top it off during a quick coffee stop. The GB70’s 6-hour charge time means you really need to plan ahead and keep it plugged in overnight before a cold morning.
Can I use any of these jump starters as a power bank for my phone or laptop in winter?
Yes, all three work as power banks, but the GBX45 is the best for this. It has a 60-watt USB-C Power Delivery port that can fast-charge phones, tablets, and even laptops. The GB40 and GB70 have standard USB ports that are fine for phones but won’t charge a laptop quickly. If you’re relying on your jump starter as an emergency power source during a winter road trip, the GBX45 is the only one that can actually keep a laptop running.
My Final Verdict
The NOCO Boost GB70 is my clear winner for winter use. With 2000 amps, 40 starts per charge, and a 400-lumen flashlight, it’s the only one that gives you genuine confidence when temperatures drop below freezing and your diesel or big V8 refuses to turn over. The GBX45 is the runner-up and the smarter choice if you drive a gas SUV or light truck and value the 48-minute recharge time over raw cranking power.
If you’re still on the fence, ask yourself one question: what’s the biggest engine you’ll ever need to start on the coldest morning of the year? If the answer is a diesel or anything over 6.0L gas, stop debating and get the GB70. If you drive a standard gas vehicle, the GBX45’s fast recharge and lighter weight make it the better everyday companion.
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...
This is for anyone who owns a diesel truck, a large V8 SUV, or simply wants the most reliable winter jump starter money can buy. The 2000-amp peak and 40 starts per charge mean you’ll never be stranded.
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...
Perfect for drivers of gas SUVs and light trucks who want a fast-recharging unit that also doubles as a 60W laptop power bank. The 48-minute recharge time is a big improvement for winter.
Best Budget: NOCO Boost GB40
- START DEAD BATTERIES — Instantly start dead batteries with 1000 amps of...
- ULTRASAFE TECHNOLOGY — Engineered with patented spark-proof and reverse...
Ideal for commuters with small gas cars who want a compact 2.4 lb unit that fits in a glove box. Just know its limits — it’s not for diesel trucks or extreme cold on big engines.
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