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Frequently Asked Questions
What is the main difference between the NOCO GB40 and GB70?
The noco boost gb40 vs gb70 comparison comes down to peak power and engine coverage. The GB40 delivers 1000A for gas engines up to 6.0L and diesels up to 3.0L; the GB70 delivers 2000A for gas engines up to 8.0L and diesels up to 6.0L. The GB70 is also heavier (5.0 vs 2.4 lbs), has a brighter flashlight (400 vs 100 lumens), and can power 12V devices. Both share NOCO’s UltraSafe spark-proof platform and IP65 rating.
Will the GB40 start a V8 truck?
Only if the engine is at or under 6.0 liters of gasoline displacement. Many full-size trucks run larger V8s, and for those the GB70 (rated to 8.0L gas) is the correct pick. Check your engine size on the door jamb sticker or owner’s manual before choosing.
Can the GB70 charge my phone?
Yes. Both models work as USB power banks: the GB40 provides up to 4 smartphone recharges and the GB70 up to 6, per NOCO. The GB70 goes further by powering 12V devices directly, such as tire inflators and small inverters.
Are both the GB40 and GB70 spark-proof?
Yes. Both use NOCO’s UltraSafe technology with spark-proof connections and reverse polarity protection, so connecting the clamps in the wrong order will not damage the unit or the vehicle. This is standard across both models.
Which is better for a diesel truck?
The GB70. Diesel engines demand more cranking power, and the GB70 is rated for diesels up to 6.0L versus the GB40’s 3.0L diesel rating. For any diesel pickup, the GB70 is the appropriate choice.
How many jump starts do you get per charge?
Per NOCO, the GB40 delivers up to 20 jump starts on a single charge and the GB70 up to 40. Real-world counts vary with engine size, temperature, and battery condition, so treat these as maximums under favorable conditions.
NOCO’s Boost line dominates the portable jump starter market, and two models get asked about more than any others: the GB40 and the GB70. They look similar, share the same UltraSafe platform, and both promise to start a dead battery in seconds. The real question is whether you need the GB70’s extra muscle or whether the smaller GB40 covers your vehicle. This head-to-head compares power, engine fit, size, and extras so you can pick with confidence.
The short answer: the NOCO Boost GB40 (1000A) handles most cars, crossovers, and SUVs with gas engines up to 6.0 liters, while the GB70 (2000A) steps up to full-size trucks and diesels with gas engines up to 8.0 liters or diesels up to 6.0 liters. Drive a typical sedan or small SUV and the GB40 is enough. Drive a big truck or diesel and the GB70 is the right call.
Quick Picks: NOCO Boost GB40 vs GB70
| Pick | Product | Best For | Check Price |
|---|---|---|---|
| Overall Winner | NOCO Boost GB40 | Most drivers: cars, crossovers, SUVs up to 6.0L gas | Check Price |
| Best Budget | NOCO Boost GB40 | Lower price tier, compact 2.4-lb design | Check Price |
| Premium Pick | NOCO Boost GB70 | Big trucks and diesels: up to 8.0L gas / 6.0L diesel | Check Price |
NOCO Boost GB40 vs GB70: Side-by-Side Specs
All figures below come from NOCO’s official product pages (no.co/gb40 and no.co/gb70) and the products’ Amazon listings, checked the same day this article was written.
| Spec | NOCO Boost GB40 | NOCO Boost GB70 |
|---|---|---|
| Peak current | 1000A | 2000A |
| Gas engines | Up to 6.0L | Up to 8.0L |
| Diesel engines | Up to 3.0L | Up to 6.0L |
| Jump starts per charge | Up to 20 | Up to 40 |
| Weight | 2.4 lbs | 5.0 lbs |
| LED flashlight | 100 lumens, 7 modes | 400 lumens, 7 modes |
| USB charging | USB-C in, USB out (up to 4 phone recharges) | USB-C in, USB out (up to 6 phone recharges) |
| 12V device power | No | Yes (tire inflators, inverters) |
| Safety | UltraSafe: spark-proof, reverse polarity protection | UltraSafe: spark-proof, reverse polarity protection |
| Water resistance | IP65 | IP65 |
| Warranty | 1 year | 1 year |
The headline difference is power: the GB70 delivers double the peak current of the GB40. That doubling is what buys the bigger engine ratings and the extra starts per charge. Everything else, the safety platform, the water resistance, the warranty, is shared DNA.
Power and Engine Fit: Where They Diverge
This is the section that decides the purchase, because engine fit is the one spec you cannot compromise on. A jump starter rated below your engine size may not turn it over on a cold morning, and there is no software update that fixes that.
The GB40 is rated for gas engines up to 6.0 liters and diesels up to 3.0 liters, per NOCO. That covers the great middle of the American fleet: four-cylinder sedans, V6 crossovers and SUVs, and most half-ton-adjacent gasoline V8s at or under 6.0 liters. If your vehicle falls in that band, the GB40’s 1000A is the right-sized tool.
The GB70 is rated for gas engines up to 8.0 liters and diesels up to 6.0 liters. That is the territory of full-size trucks, large SUVs with big V8s, and diesel pickups. The 2000A peak current is doing real work here: diesel engines need substantially more cranking power, especially in cold weather, and the GB70’s rating reflects that.
A practical rule: check your engine displacement (it is on the door jamb sticker or in the owner’s manual) and buy the model whose rating clears it with margin. If you are between the two, or you plan to keep the unit for years across multiple vehicles, the GB70’s headroom is worth considering. Our full GB40 review walks through that model in more detail.
Size, Weight, and Everyday Carry
Here the GB40 has a clear edge. At 2.4 pounds it slips into a glove box, door pocket, or backpack without a second thought. It is the unit you will actually keep in the car, which is the entire point of owning one.
The GB70 weighs 5.0 pounds, more than double. It is still portable, but it reads more like a toolbox item than a glove-box item. For a truck owner who stores gear in the cab or bed toolbox anyway, that is a non-issue. For a sedan driver who values a tidy trunk, the GB40’s compactness is a genuine everyday advantage.
Both carry an IP65 water-resistance rating, so rain at the roadside is not a concern for either, and both recharge over USB-C.
Flashlight, Power Bank, and Extras
Both units double as USB power banks and LED flashlights, but the GB70’s versions are stronger across the board. Its flashlight puts out 400 lumens versus the GB40’s 100, with the same seven modes including SOS and emergency strobe. On a dark roadside, that difference is noticeable.
On the power-bank side, the GB40 delivers up to 4 smartphone recharges per NOCO, while the GB70 manages up to 6. The GB70 adds one more trick the GB40 lacks: it can power 12V devices directly, such as a tire inflator or a small power inverter. If you already carry a 12V tire inflator, pairing it with the GB70 means one fewer thing to keep charged.
None of these extras should decide the purchase on their own, but they widen the GB70’s lead for buyers who want one device to cover more roadside scenarios.
Price-Tier Trade-Off
NOCO positions the GB70 a full tier above the GB40, which is expected given double the peak current and the larger battery inside. Amazon pricing shifts with sales and seasons, so check the live listings rather than relying on any figure quoted elsewhere.
The value question is simple: the GB40 costs less and covers most vehicles, so it is the better value if your engine fits its ratings. The GB70 costs more because it does more. Paying for power you will never use is not value, but neither is saving money on a unit that cannot start your truck in January.
Who Should Buy the GB40 vs the GB70
Buy the NOCO Boost GB40 if: you drive a car, crossover, or SUV with a gas engine up to 6.0L or a small diesel up to 3.0L; you want the most compact unit; you prefer the lower price tier. This is most drivers.
Buy the NOCO Boost GB70 if: you drive a full-size truck, large SUV, or diesel pickup (gas up to 8.0L, diesel up to 6.0L); you want maximum cranking headroom; you value the brighter 400-lumen light, the extra jump starts per charge, or the 12V device power.
Either works if: you drive something small and just want the biggest safety margin, or you own multiple vehicles and want one unit that covers all of them. In that case the GB70’s headroom is the tiebreaker.
For broader context, our roundup of the best portable car jump starters compares NOCO against the wider field, and our car battery maintenance guide covers how to keep the battery you are jumping healthy in the first place.
The Verdict
The GB40 vs GB70 decision comes down to your engine. The GB40’s 1000A and 6.0L gas / 3.0L diesel ratings cover the mainstream, in a lighter, more compact, lower-tier package that most drivers will be happiest living with. The GB70’s 2000A buys genuine capability for big gasoline V8s and diesels, plus a brighter light, more starts per charge, and 12V device power.
If your engine fits the GB40’s ratings, buy the GB40 and keep the change. If it does not, or you want one unit with headroom for anything in the driveway, the GB70 earns its premium.
NOCO Boost GB40 on Amazon: 1000A, up to 6.0L gas / 3.0L diesel, 2.4 lbs.
NOCO Boost GB70 on Amazon: 2000A, up to 8.0L gas / 6.0L diesel, 5.0 lbs, 12V device power.
