NOCO Boost GBX155 4250A UltraSafe or NOCO Boost Air AX65 2000A? Which NOCO Model to Buy
Compare the NOCO Boost GBX155 and AX65 jump starters. We review peak amps, engine compatibility, and charging specs to help you pick the right model.
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The noco boost gbx155 4250a ultrasafe vs boost air ax65 2000a comparison highlights two distinct 12V lithium jump starters. Both models feature UltraSafe 2.0 technology for spark-proof operation and offer 60W USB-C charging for your devices. They share reverse polarity protection and a 1-year warranty. The main difference lies in their output and function. The GBX155 delivers higher peak amps for larger engines, while the AX65 includes a built-in air compressor for tire inflation.
Peak Amps
4250A
2000A
Gas Engine Rating
Up to 10.0L
Up to 8.0L
Diesel Engine Rating
Up to 8.0L
Up to 6.0L
Air Compressor
Not listed
Yes (67 LPM)
Digital Display
Not listed
Yes
Weight
7.01 pounds
9.79 pounds
Choose the first if
- You need to jump start large gas engines up to 10.0L or diesel engines up to 8.0L.
- You want a lighter unit that weighs 7.01 pounds.
- You prioritize maximum peak amps for extreme performance.
Choose the second if
- You need an integrated air compressor to inflate tires up to 35 inches.
- You want a digital display to set precise pressure from 15 to 100 PSI.
- You need a unit that recharges in 48 minutes for quick top-offs.
Verdict
Choose the GBX155 if your primary need is raw power for larger engines and you prefer a lighter device. Choose the AX65 if you want a versatile tool that handles tire inflation with precise digital controls. Both models offer robust safety features and fast charging for your electronics.
NOCO GBX155 vs AX65 Head-to-Head
Jump starting power
Edge: NOCO GBX155 4250A Jump Starter
The NOCO Boost GBX155 delivers 4,250 peak amps, while the Boost Air AX65 provides 2,000 peak amps. This significant difference means the GBX155 handles larger engines with ease. You can use the GBX155 on gas engines up to 10.0 liters and diesel engines up to 8.0 liters. The AX65 is rated for gas engines up to 8.0 liters and diesel engines up to 6.0 liters. If you own a large truck or heavy-duty vehicle, the higher amperage of the GBX155 offers a wider safety margin. The extra power ensures reliable starts even in challenging conditions where a smaller battery might struggle to turn over a stiff engine.
Tire inflation capability
Edge: NOCO Boost Air AX65 2000A Jump Starter
The Boost Air AX65 includes a built-in air compressor, a feature the GBX155 lacks. The AX65 inflates tires at 67 liters per minute, reaching 0 to 40 PSI in just two minutes. It handles tires up to 35 inches and offers precise pressure control from 15 to 100 PSI. The GBX155 is a pure jump starter and power bank without any inflation functions. If you frequently check tire pressure or need to inflate tires on the road, the AX65 is the only choice. This all-in-one design saves you from carrying a separate pump, making roadside repairs faster and more convenient for your daily routine.
Portability and size
Edge: NOCO GBX155 4250A Jump Starter
The GBX155 is more compact and lighter than the AX65. The GBX155 weighs 7.01 pounds and measures 13.5 inches in height, 8.18 inches in length, and 4.84 inches in width. The AX65 is heavier at 9.79 pounds and has different dimensions, measuring 6.42 inches in height, 10.6 inches in length, and 7.24 inches in width. The GBX155 is easier to store in tight spaces or glove compartments due to its narrower profile. If you prioritize a lighter device that is easier to handle and pack, the GBX155 is the better option. The AX65 is bulkier due to its integrated air compressor components.
Recharge speed
Edge: NOCO Boost Air AX65 2000A Jump Starter
Both units use 60W USB-C Power Delivery for charging, but their recharge times differ. The GBX155 recharges fully in 2.7 hours. The AX65 takes 48 minutes to recharge. This means the AX65 gets back to full power significantly faster than the GBX155. If you need to quickly top up the device after use, the AX65 allows you to return to service sooner. Both models can provide enough power for a jump start in just five minutes from a depleted state. However, for a complete charge cycle, the AX65 is the quicker option, which is useful if you rely on the unit frequently.
Lighting features
Edge: NOCO GBX155 4250A Jump Starter
The GBX155 features a 500-lumen LED flashlight with seven light modes, including SOS and strobe. The AX65 also includes an LED flashlight, but the specific lumen output and mode count are not detailed in the provided data. The GBX155’s high-intensity light is designed to illuminate repairs and emergencies effectively. If you need a bright, versatile light source for night-time roadside work, the GBX155 offers a clearly defined high-output option. The AX65 provides lighting as part of its all-in-one package, but without specific brightness specs, the GBX155 stands out for its powerful illumination capabilities.
Which NOCO Jump Starter Fits Your Needs
You need max power for large engines
Our pick: NOCO GBX155 4250A Jump Starter
The GBX155 delivers 4,250 peak amps. This rating supports gas engines up to 10.0L and diesel engines up to 8.0L. If you drive a heavy truck or large SUV, this extra amperage ensures reliable starts. The 60-second timer helps conserve power, giving you up to 18 jump starts per charge for consistent performance.
You want tire inflation and lights
Our pick: NOCO Boost Air AX65 2000A Jump Starter
The AX65 includes a built-in air compressor. It inflates tires up to 35 inches in just two minutes. The digital display sets pressure from 15 to 100 PSI with auto shut-off. You also get a 500-lumen LED flashlight. This all-in-one design handles dead batteries, low tires, and lighting emergencies without extra gear.
You prioritize fast recharge times
Our pick: NOCO GBX155 4250A Jump Starter
The GBX155 recharges in 2.7 hours via USB-C Power Delivery. You can gain enough power for a jump start in just five minutes, even from a depleted battery. The AX65 takes 48 minutes to fully recharge. If quick top-offs are critical for your routine, the GBX155 offers faster turnaround for your device.
NOCO GBX155 4250A Jump Starter
Best for: Large gas and diesel engines
- Peak Amps
- 4250A
- Voltage
- 12V
- Gas Engine Rating
- Up to 10.0L
- Diesel Engine Rating
- Up to 8.0L
- Battery Type
- Lithium
- Charging Power
- 60W
The NOCO Boost GBX155 is a 12V lithium jump starter rated at 4,250 peak amps. It handles gas engines up to 10.0L and diesel engines up to 8.0L. The unit features Turbo Chargeable technology, allowing a full recharge in 2.7 hours via USB-C Power Delivery. It includes a 60-watt output for charging devices and a 500-lumen LED flashlight. This model is designed for users needing high cranking power for larger vehicles.
- 4,250A peak amps for gas engines up to 10.0L
- Recharges in 2.7 hours via USB-C Power Delivery
- 60-watt USB-C output for portable devices
- 500-lumen LED flashlight with 7 modes
- Spark-proof and reverse polarity protection
- Heavier build at 7.01 pounds compared to the AX65
- Larger dimensions measuring 13.5 inches in height
- Shorter 1-year warranty coverage
- You need 4,250A peak amps for large engines
- You want fast recharging via USB-C Power Delivery
- You require a high-output portable power bank
- You prefer a lighter and more compact unit
- You only need to jump small gasoline engines
- You want a longer warranty period
Verdict: NOCO Boost GBX155 4250A Jump Starter fits buyers who prioritize maximum cranking power for large gas and diesel engines over portability.
NOCO Boost Air AX65 2000A Jump Starter
Best for: Drivers needing jump start and fast tire inflation
- Peak Amps
- 2000A
- Voltage
- 12V
- Gas Engine Rating
- Up to 8.0L
- Diesel Engine Rating
- Up to 6.0L
- Battery Type
- Lithium
- Inflator Pressure
- 100 PSI
The NOCO Boost Air AX65 combines a 2000A jump starter with a high-output air compressor. It inflates tires up to 35 inches from 0 to 40 PSI in just 2 minutes. You can jump gas engines up to 8.0L or diesel engines up to 6.0L. The unit includes a digital display for precise pressure control. It also serves as a 60W power bank for your devices.
- 2000A peak amps for reliable jumps
- 67 LPM inflation speed fills tires in 2 minutes
- 60W USB-C power bank for device charging
- Digital display with auto shut-off for accurate pressure
- 2000A peak output is lower than the 4250A on the list
- 9.79-pound weight is heavier than compact alternatives
- 10.6-inch length is bulkier for tight storage
- You need a single device for jumping and inflating
- You drive trucks or larger vehicles up to 8.0L gas
- You want fast tire inflation on the roadside
- You only need a jump starter without inflation
- You prioritize the lowest possible weight for storage
- You require peak amps above 2000A for heavy duty
Verdict: NOCO Boost Air AX65 2000A Jump Starter is ideal for drivers who want a two-in-one tool for jumps and tire inflation. It suits those who value speed and convenience over minimal size.
Specifications side by side
| Spec | NOCO GBX155 4250A Jump Starter | NOCO Boost Air AX65 2000A Jump Starter |
|---|---|---|
| Peak Amps | 4250A | 2000A |
| Voltage | 12V | 12V |
| Gas Engine Rating | Up to 10.0L | Up to 8.0L |
| Diesel Engine Rating | Up to 8.0L | Up to 6.0L |
| Battery Type | Lithium | Lithium |
| Inflator Pressure | – | 100 PSI |
| Charging Power | 60W | 60W |
| Display Type | – | Digital |
| Color | Gray | Black |
| Recommended Use | Motorcycles | Trucks |
| Features | Reverse Polarity Protection | Air Compressor, Reverse Polarity Protection |
| Dimensions | 8.18 × 4.84 × 13.5 inches | 10.6 × 7.24 × 6.42 inches |
| Weight | 7.01 pounds | 9.79 pounds |
| Size | 4250A | 2000A |
| Model | GBX155 | AX65 |
Frequently asked questions
Can the NOCO GBX155 jump start a diesel engine?
Yes, the NOCO GBX155 is designed for large engines. It features a 10.0L gas engine rating. It also supports diesel engines up to 8.0L. This high cranking power makes it suitable for heavy trucks and large SUVs. You get 4,250 peak amps for reliable starts in cold conditions.
Does the NOCO AX65 include an air compressor?
Yes, the NOCO Boost Air AX65 includes a built-in air compressor. This feature allows you to inflate tires directly from the unit. It serves as a two-in-one tool for jump starting and tire maintenance. This adds convenience for drivers who want to handle multiple roadside tasks with one device.
Which NOCO model is lighter and more portable?
The NOCO GBX155 is the lighter option. It weighs 7.01 pounds. In comparison, the AX65 weighs 9.79 pounds. The GBX155 also has a more compact form factor with a width of 4.84 inches. You will find it easier to store in smaller glove compartments or trunk spaces.
Can I use the GBX155 on motorcycles?
Yes, the NOCO GBX155 lists motorcycles as a recommended use. Its 4,250 peak amps provide ample power for small two-wheelers. The reverse polarity protection ensures safe connections. You can confidently use this unit for motorcycles without worrying about damaging the electrical system during the jump start process.
What is the maximum gas engine size for the AX65?
The NOCO Boost Air AX65 supports gas engines up to 8.0L. It also handles diesel engines up to 6.0L. This rating is lower than the GBX155. You should choose this model if you drive a standard truck or SUV that does not require maximum cranking power.
Do both units offer USB charging for devices?
Yes, both the GBX155 and AX65 provide USB-C charging. Each unit offers 60W of power output. You can charge your smartphone, tablet, or laptop while on the road. This shared feature ensures your electronics stay powered during emergencies or long trips without needing a separate power bank.
Is the NOCO AX65 suitable for large trucks?
The NOCO AX65 is rated for trucks. It provides 2,000 peak amps. This power level suits standard trucks and SUVs. It may struggle with very large commercial vehicles. You should verify your engine size against the 8.0L gas and 6.0L diesel limits before relying on it for heavy-duty starts.
Which model has reverse polarity protection?
Both the NOCO GBX155 and AX65 feature reverse polarity protection. This safety mechanism prevents damage if you connect the clamps incorrectly. You do not need to worry about sparking or electrical faults when connecting the cables. This feature is standard on both 12V lithium jump starters in this comparison.
See also
Where these figures come from
The price, the list price it is compared against and the specifications on this page are read from the Amazon product listing. Scores are out of 10, based on listed specifications and buyer feedback, and no product here has been handled or measured by us. The award ribbons are calculated across the products in this guide only, and each one states the figure it was based on.
