This NOCO Boost GB40 review finds the NOCO Boost GB40 12V 1000A UltraSafe the strongest fit for most drivers because its 12V output, 1000-amp rating, compact 2.5-pound body, and support for engines up to 6.0L gas or 3.0L diesel cover common cars, crossovers, and light trucks. Larger diesel engines and commercial vehicles need more starting capacity, while the GB40 makes more sense for glove-box storage and routine roadside backup.
Pros
- High 1000-amp peak rating for a compact 2.5-pound jump starter
- Stated compatibility with 12V vehicles and engines up to 6.0L gas or 3.0L diesel
- Built-in spark-proof and reverse-polarity protection
- Adds power-bank and flashlight functionality for emergency use
Cons
- The stated engine compatibility is limited to up to 6.0L gas and 3.0L diesel
- The listed warranty period is one year
The NOCO Boost GB40 is a 12V portable lithium jump starter with 1000 amps of peak power. The published product data states that it can provide up to 20 starts per charge on engines up to 6.0L gas and 3.0L diesel.
Safety features include spark-proof technology and reverse-polarity protection. The unit also works as a power bank for smartphones, tablets, and other devices, and recharges in three hours according to the published data.
An integrated 100-lumen LED flashlight provides seven modes, including SOS and strobe. The 2.5-pound housing is rated IP65 and uses rubberized over-molding. The box includes the GB40, heavy-duty clamps, a USB-C charging cable, and a microfiber storage bag. The product is backed by a one-year warranty and is engineered in the USA.
Specifications
| Color | Gray |
|---|---|
| Size | 1000 Amps |
| Dimensions | 6.5748031429 x 3.149606296 x 7.7165354252 Inches |
| Weight | 2.4 Pounds |
| Product Group | Automotive Parts and Accessories |
| Binding | Automotive |
Detailed Review
Key features:
- Provides 1000 amps of peak lithium power for starting 12V vehicles
- Supports up to 20 starts per charge on engines up to 6.0L gas and 3.0L diesel
- Includes spark-proof and reverse-polarity protection
- Functions as an emergency power bank for smartphones, tablets, and more
- Features a 100-lumen LED flashlight with seven modes, including SOS and strobe
- Uses an IP65-rated housing with rubberized over-molding for water, dust, and impact protection
Best For / Avoid If
Best for buyers prioritizing
- High 1000-amp peak rating for a compact 2.5-pound jump starter
- Stated compatibility with 12V vehicles and engines up to 6.0L gas or 3.0L diesel
- Built-in spark-proof and reverse-polarity protection
Consider another option if
- The stated engine compatibility is limited to up to 6.0L gas and 3.0L diesel
- The listed warranty period is one year
Pros
- High 4,250A rating with stated support for engines up to 10.0L gas and 8.0L diesel
- 60W two-way USB-C Power Delivery adds portable charging functionality
- Fast USB-C recharge time and a 5-minute jump-start charge feature
- Integrated flashlight includes SOS and strobe modes
- Includes heavy-duty clamps, USB-C charging cable, microfiber storage bag, and a 1-year warranty
Cons
- The published compatibility information is limited to gas engines up to 10.0L and diesel engines up to 8.0L
The NOCO Boost X GBX155 is a 12V lithium jump starter rated at 4,250A. The published product data lists compatibility with gas engines up to 10.0L and diesel engines up to 8.0L.
Its features include spark-proof and reverse-polarity protection, USB-C Power Delivery with 60W output, and a stated recharge time of approximately 2.7 hours. The unit can also gain enough power for a jump start in 5 minutes, even from a completely depleted battery.
The GBX155 includes a 500-lumen LED flashlight with seven modes, including SOS and strobe. The listed contents are the jump starter, heavy-duty clamps, a USB-C charging cable, and a microfiber storage bag. The product is backed by a 1-year warranty.
Specifications
| Color | Gray |
|---|---|
| Size | 4250A |
| Dimensions | 8.18 x 4.84 x 13.51 inches |
| Weight | 7.01 pounds |
| Product Group | Automotive Parts and Accessories |
| Binding | Automotive |
Detailed Review
Key features:
- Rated at 4,250A for gas engines up to 10.0L and diesel engines up to 8.0L
- USB-C Power Delivery supports 60W charging for phones, tablets, laptops, and other devices
- Recharges in approximately 2.7 hours through USB-C Power Delivery
- Can gain enough charge for a jump start in 5 minutes, even from a completely depleted battery
- Provides up to 18 jump starts per charge according to the listing
- Includes spark-proof and reverse-polarity protection
Best For / Avoid If
Best for buyers prioritizing
- High 4,250A rating with stated support for engines up to 10.0L gas and 8.0L diesel
- 60W two-way USB-C Power Delivery adds portable charging functionality
- Fast USB-C recharge time and a 5-minute jump-start charge feature
Consider another option if
- The published compatibility information is limited to gas engines up to 10.0L and diesel engines up to 8.0L
Pros
- Supports a broad range of gas and diesel engine sizes
- Includes safety features designed to help prevent sparks and incorrect connections
- Combines jump-starting, emergency device charging, and flashlight functions
- Includes heavy-duty clamps, USB-C charging cable, and microfiber storage bag
Cons
- The listed recharge time is 6 hours
- At 5.0 lb, it may add noticeable weight to a glove box or emergency kit
The NOCO Boost GB70 is a 12V lithium jump starter with 2000 amps of peak power. It is rated for up to 8.0L gas and 6.0L diesel engines and includes spark-proof and reverse-polarity protection.
- Integrated power bank for smartphones, tablets, and more
- 400-lumen LED flashlight with seven light modes, including SOS and strobe
- IP65-rated housing with rubberized over-molding
- 5.0 lb form factor
- Includes heavy-duty clamps, USB-C charging cable, and microfiber storage bag
- Listed recharge time: 6 hours
- 1-year warranty
Specifications
| Color | Gray |
|---|---|
| Size | 2000 Amps |
| Dimensions | 2.8 x 6 x 8.8 Inches |
| Weight | 5 pounds |
| Product Group | Automotive Parts and Accessories |
| Binding | Automotive |
Detailed Review
Key features:
- Rated for up to 8.0L gas and 6.0L diesel engines
- Provides 2000 amps of peak lithium power
- Includes spark-proof and reverse-polarity protection for 12V vehicles
- Functions as a power bank for smartphones, tablets, and other devices
- Features a 400-lumen LED flashlight with seven light modes
- IP65-rated housing includes rubberized over-molding for water, dust, and impact protection
Best For / Avoid If
Best for buyers prioritizing
- Supports a broad range of gas and diesel engine sizes
- Includes safety features designed to help prevent sparks and incorrect connections
- Combines jump-starting, emergency device charging, and flashlight functions
Consider another option if
- The listed recharge time is 6 hours
- At 5.0 lb, it may add noticeable weight to a glove box or emergency kit
The GB40 is a 12V lithium jump starter for vehicles with drained batteries. NOCO lists 1000 amps of peak power and up to 20 starts per charge on engines within its stated 6.0L gas and 3.0L diesel limits. Those figures describe the manufacturer’s intended range, not a guarantee for every vehicle or battery condition.
A jump starter cannot repair a failed battery, damaged cable, bad starter, or charging-system fault. It can supply temporary starting power when the vehicle battery lacks enough energy to crank the engine. A battery with internal damage may still refuse to start, even with a fully charged booster.
The GB40 uses spark-proof and reverse-polarity protection, according to its listing. That matters for occasional users who may worry about connecting clamps incorrectly. Protection reduces connection risk, but it does not remove the need to follow the vehicle and jump starter instructions.
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| Model | Peak power | Stated engine range | Weight | Recharge time | USB power |
|---|---|---|---|---|---|
| NOCO Boost GB40 12V 1000A UltraSafe | 1000 amps | Up to 6.0L gas, 3.0L diesel | 2.5 lb | 3 hours | Emergency power for smartphones, tablets, and more |
| NOCO Boost GB70: 2000A UltraSafe Jump Starter | 2000 amps | Up to 8.0L gas, 6.0L diesel | 5.0 lb | 6 hours | Emergency power for smartphones, tablets, and more |
| NOCO Boost X GBX155: 4250A UltraSafe Jump Starter | 4250 amps | Up to 10.0L gas, 8.0L diesel | 2.7 hours through USB-C Power Delivery | 60-watt USB-C Power Delivery |
NOCO Boost GB40: Best Fit for Everyday Vehicles
Best for: Drivers who want a small emergency booster for a 12V car, crossover, SUV, or light truck within the stated engine limits.
The GB40 balances capacity and storage better than its larger siblings. Its 2.5-pound form makes glove-box or emergency-kit storage practical, while the 1000-amp rating gives it a broad fit for ordinary gasoline vehicles. Diesel support reaches 3.0L, which covers some smaller diesel applications but excludes larger diesel pickups and many commercial engines.
NOCO says the unit can provide up to 20 starts per charge within its engine limits. That figure helps explain the GB40’s role as emergency equipment rather than a workshop power source. A driver can keep it charged, store it in the vehicle, and use it during a dead-battery event without carrying a full-size booster pack.
The integrated power bank can supply emergency power to phones and tablets. The unit recharges in three hours, according to the listing. That shorter recharge time helps after use, but the owner still needs a charging routine. A jump starter left discharged in a vehicle cannot help during the next roadside problem.
Its 100-lumen LED flashlight has seven modes, including SOS and strobe. Those modes can illuminate a clamp connection or roadside area after dark. They do not replace warning triangles, reflective gear, or a safe location away from traffic.
The GB40 uses an IP65-rated housing with rubberized over-molding, per NOCO’s product description. That gives the enclosure protection against dust and water jets under the stated rating. IP65 does not mean submersion protection, so avoid treating it like waterproof equipment.
Skip it if: your vehicle has a diesel engine above 3.0L, a gasoline engine above 6.0L, or a commercial-duty starting requirement. The GB70 or GBX155 offers a larger stated engine range. Also skip the GB40 if your priority is laptop charging, because its listing does not specify the 60-watt USB-C Power Delivery output found on the GBX155.
NOCO Boost GB70: More Reserve for Trucks and Larger Engines
Best for: Owners of larger gasoline vehicles or diesel vehicles up to the stated 8.0L gas and 6.0L diesel limits.
The GB70 doubles the GB40’s listed peak rating to 2000 amps. NOCO rates it for gasoline engines up to 8.0L and diesel engines up to 6.0L. That makes it the middle choice for drivers whose vehicle falls outside the GB40 range but does not need the GBX155’s extreme capacity.
Its larger capability brings a storage tradeoff. The GB70 weighs 5.0 pounds, twice the stated weight of the GB40. That difference may not matter in a truck toolbox, but it matters for a small emergency kit or a driver who carries equipment daily. The GB70 is portable, yet less compact than the everyday-car option.
The listing says the GB70 can provide up to 40 starts per charge within its stated engine limits. It also includes a power bank for emergency phone and tablet charging. The recharge time is six hours, twice the GB40’s listed three-hour time. Owners should plan charging after use rather than waiting for another emergency.
A 400-lumen LED flashlight gives the GB70 more listed light output than the GB40. Seven modes include SOS and strobe. That feature can help with nighttime connections, but it remains secondary to safe roadside positioning and proper protective equipment.
Like the GB40, the GB70 uses spark-proof and reverse-polarity protection, an IP65-rated housing, rubberized over-molding, and high-conductivity clamps. These features support easier storage and connection handling, but they do not expand the model beyond 12V vehicle use or its stated engine range.
Skip it if: your vehicle fits comfortably within the GB40’s limits and minimum size matters. The GB70 adds weight and takes longer to recharge. It also makes less sense for buyers who want high-output USB-C charging, since the GBX155 specifically lists 60-watt USB-C Power Delivery.
NOCO Boost X GBX155: The Choice for Extreme Engine Sizes
Best for: Drivers who need the widest stated engine range, including gasoline engines up to 10.0L or diesel engines up to 8.0L.
The GBX155 sits at the top of this group with 4250 amps of listed peak power. Its stated range reaches 10.0L gas and 8.0L diesel, making it the logical choice for large trucks, heavy equipment applications within the 12V scope, and owners who want more capacity than the GB40 or GB70 offers.
Its main advantage is not subtle: the engine-size ceiling is much higher. That extra range matters only when the vehicle needs it. A compact-car owner gains little from carrying the largest model when the GB40 already covers the vehicle’s stated engine size.
USB-C Power Delivery sets the GBX155 apart as a charging device. The 60-watt output can charge phones, tablets, laptops, and other compatible devices, according to the listing. Dual-direction charging lets the unit act as a high-output portable power bank. Buyers should match their device and cable requirements to USB-C Power Delivery rather than assume every laptop will charge at the same rate.
Recharge takes 2.7 hours through USB-C Power Delivery. The listing also says five minutes of charging can provide enough power for a jump start from a fully depleted unit. That is useful during an emergency, but the result depends on correct charging equipment and the vehicle’s starting needs. The GBX155 also uses a 60-second timer to conserve power and lists up to 18 starts per charge.
A 500-lumen flashlight with seven modes provides the highest listed light output here. The GBX155 includes spark-proof and reverse-polarity protection under NOCO’s UltraSafe 2.0 description. Those protections help connection handling, while the 12V limit still controls vehicle fitment.
Skip it if: you want the lightest emergency booster or your vehicle falls within the GB40’s smaller range. The GBX155 is a premium-sized solution for large engines and higher USB-C power needs. Its extra capacity adds little value for a compact car used mainly for commuting.
GB40, GB70, or GBX155: Which One Fits?
Start with engine type and displacement. The GB40 covers up to 6.0L gas and 3.0L diesel. The GB70 raises that limit to 8.0L gas and 6.0L diesel. The GBX155 reaches 10.0L gas and 8.0L diesel. These are the clearest selection rules in this group.
- Choose the GB40 for common 12V vehicles, compact storage, and faster listed recharge time.
- Choose the GB70 for larger gasoline engines or diesel engines up to 6.0L, where the GB40’s stated range falls short.
- Choose the GBX155 for the widest engine coverage or 60-watt USB-C Power Delivery.
Weight changes the ownership experience. The GB40 weighs 2.5 pounds. The GB70 weighs 5.0 pounds. The GBX155 listing emphasizes high output and USB-C charging but does not include a weight figure here. For a glove box, the GB40 has the clearest compact-storage advantage. For a truck toolbox, the GB70’s added weight may be acceptable. Large-engine owners should prioritize the stated engine range over portability.
Recharge time also changes the routine. The GB40 takes three hours, the GB70 takes six hours, and the GBX155 takes 2.7 hours through USB-C Power Delivery. Faster recharge does not remove the need to keep the unit charged. Store the clamps and cable together, inspect them before use, and recharge after every jump event.
What the GB40 Cannot Replace
The GB40 is not a battery maintainer. It does not keep a parked vehicle’s battery charged over weeks or months. Owners of stored cars should consider a battery maintainer instead, especially when the vehicle has access to suitable electrical power. CarTechTalk’s guide to the best battery maintainer for winter car storage covers that different use case.
It also is not a tire inflator. Drivers who want one device for battery starting and tire inflation need a combination product with an air compressor. The GB40 listing describes jump starting, USB power, and lighting, not tire inflation. A guide to the best jump starter and tire inflator for winter driving suits that requirement better.
None of these models should be treated as a cure for repeated battery failure. Frequent dead batteries can point to age, parasitic draw, poor connections, or charging-system trouble. A jump starter handles the immediate start, while diagnosis addresses the reason the battery keeps going flat.
Who Should Skip This Entire Guide?
Skip all three if your vehicle uses a voltage system outside 12V, falls beyond the stated engine limits, or needs a permanently installed starting system. Also skip them if you need a battery charger, a maintainer, an air compressor, or professional diagnostic equipment rather than emergency starting power.
Drivers with large diesel trucks should compare the GB70 and GBX155 against engine size first. Car owners with small gasoline engines should avoid paying for capacity they will not use. If the vehicle has a known electrical fault, arrange proper repair instead of relying on repeated boosts.
Final Verdict
The NOCO Boost GB40 12V 1000A UltraSafe earns the strongest recommendation for the typical 12V car owner because it combines a manageable 2.5-pound form with a stated range up to 6.0L gas and 3.0L diesel. Its three-hour recharge time, phone power bank, flashlight, and connection protections add useful roadside functions.
The GB70 is the better fit for larger engines and diesel vehicles that exceed the GB40’s limits. Accept its 5.0-pound weight and six-hour recharge time in exchange for the higher 2000-amp rating and wider stated engine range.
The GBX155 makes sense for large engines or buyers who need 60-watt USB-C Power Delivery. It is excessive for many commuter cars, but its 4250-amp rating and 10.0L gas, 8.0L diesel range serve a different ownership need. Match the booster to the vehicle, keep it charged, and treat every engine-size limit as a selection boundary.
