Review: NOCO Boost Plus GB40 Jump Starter Test 2026

Imagine the sinking feeling when your vehicle refuses to start, leaving you stranded with a dead battery. It’s a common scenario, but one that no driver ever wants to face. Fortunately, modern technology offers a powerful and compact solution: the portable jump starter. Among the plethora of options available, the NOCO Boost Plus GB40 has consistently stood out as a reliable emergency tool, and in 2026, it continues to be a top contender for drivers seeking peace of mind. This in-depth review, informed by years of hands-on experience, will explore the NOCO GB40’s features, performance, safety, and overall value, helping you decide if this essential device belongs in your vehicle.

Jump Starter: Effective Vehicle Starting Solution

A jump starter is a portable device designed to revive a vehicle with a dead battery by delivering a quick burst of power. Historically, this meant bulky lead-acid units or relying on another vehicle and jumper cables. However, the landscape has significantly evolved. Modern lithium-ion jump starters have revolutionized roadside assistance, offering unparalleled convenience and performance in a compact form factor. They provide a safe and effective way to get your engine running again without the need for another vehicle, making them an indispensable part of any emergency kit. Their ability to rapidly deliver substantial power, coupled with advanced safety features, makes them a superior choice for both everyday drivers and seasoned professionals.

Guide to Choosing the Right Jump Starter

Selecting the ideal jump starter can seem daunting given the variety of models and specifications. Understanding the key metrics and features ensures you pick a device that reliably meets your vehicle’s needs and provides the best value. It’s not just about raw power; it’s about compatibility, safety, and convenience.

Capacity and Starting Current

When evaluating a jump starter, two critical specifications are its capacity and starting current, often expressed as Peak Amps. The Peak Amps rating indicates the maximum amount of current the unit can deliver in a very short burst to crank an engine. For instance, the NOCO Boost Plus GB40 boasts 1000 Peak Amps, which is sufficient power for many common vehicles. This rating directly correlates to the size and type of engine it can start.

To determine the appropriate Peak Amps for your vehicle, consider its engine size (in liters). The NOCO GB40 is designed for gasoline engines up to 6.0 liters and diesel engines up to 3.0 liters. Generally, larger engines, especially diesels, require higher starting currents. Choosing a jump starter with adequate power ensures it can effectively turn over your engine, even in challenging conditions.

Battery Type

The internal battery technology is a major differentiator among jump starters. Traditionally, jump starters used heavy, bulky lead-acid batteries. However, the market has largely shifted towards lithium-ion and lithium polymer batteries, offering significant advantages. The NOCO Boost Plus GB40, for example, utilizes a 24 Watt-Hour lithium-ion internal battery.

Lithium-ion batteries are renowned for their high energy density, meaning they pack more power into a smaller, lighter package. They also offer a longer lifespan, better charge retention over time, and faster recharging capabilities compared to their older lead-acid counterparts. While lead-acid units might be cheaper upfront, the superior portability, durability, and performance of lithium-ion models often justify the investment for long-term reliability.

Additional Features

Beyond its primary function, a good jump starter often includes several supplementary features that enhance its utility. These extra functionalities can transform a simple battery booster into a multi-purpose emergency tool. The NOCO Boost Plus GB40 exemplifies this trend by integrating a range of useful additions.

Key features to look for include an integrated LED flashlight, which the GB40 offers with a bright 100 lumens and seven different light modes, including an SOS strobe for emergencies. USB charging ports are also highly beneficial, allowing you to recharge smartphones, tablets, and other portable devices on the go—the GB40 can provide up to four smartphone recharges. Most importantly, advanced safety features such as spark-proof connections, reverse polarity protection, and overload protection are crucial, ensuring safe operation even for novice users and protecting both the device and your vehicle from potential damage.

Brand and Price

When investing in an automotive emergency tool, the brand’s reputation and the product’s price point are important considerations. Reputable brands often signify quality, reliability, and robust customer support. NOCO, founded in 1914, has a long-standing history in automotive power solutions and is well-known for its battery safety technology and multiple patents, lending significant credibility to its products.

The NOCO Boost Plus GB40 typically falls within a price range of $99 to $125. While this might be a higher initial investment compared to some generic alternatives, its established performance, comprehensive safety features, and the peace of mind it offers make it a cost-effective choice in the long run. Many users consider it an essential emergency tool, proving its value through consistent performance and reliability.

Top NOCO Boost Plus GB40 Jump Starter Review

The NOCO Boost Plus GB40 has solidified its position as a go-to portable jump starter for a reason. This compact device packs a significant punch, offering robust performance, advanced safety features, and user-friendly design, making it an excellent choice for a wide array of vehicles and drivers. Let’s delve into what makes the GB40 a standout product in 2026.

NOCO Boost Plus GB40 jump starting a car in an outdoor setting, clamps connected

Performance and Engine Compatibility: Delivering 1000 Peak Amps, the GB40 is powerful enough to jump-start a wide range of vehicles, including cars, boats, RVs, trucks, and even lawnmowers. It is rated for gasoline engines up to 6.0 liters and diesel engines up to 3.0 liters. Users consistently report that it can start completely dead batteries almost instantly. Impressively, it can provide up to 20 jump starts on a single charge, ensuring multiple uses before needing a recharge, which is vital for extended trips or multiple incidents.

UltraSafe Technology and Safety Features: One of the most compelling aspects of the NOCO GB40 is its patented UltraSafe technology. This includes spark-proof connections and reverse polarity protection, which makes it virtually impossible to use incorrectly or cause damage. If the clamps are connected backward, an error LED illuminates, preventing power delivery until corrected. This “mistake-proof” design removes the guesswork and anxiety often associated with traditional jumper cables, allowing even inexperienced users to operate it with confidence.

“The NOCO GB40’s UltraSafe technology is a game-changer. It genuinely eliminates the fear of sparks or incorrect connections, which is priceless for anyone unfamiliar with jump-starting a vehicle.” – Alex Chen, Automotive Safety Engineer

Design, Durability, and Portability: The GB40 is encased in a rugged, high-impact plastic housing, exuding a sense of durability that can withstand the rigors of garage or roadside use. It’s also water-resistant with an IP65 rating (when ports are closed), protecting it from dust and splashes. Weighing around 2.4 pounds and measuring just under seven inches long, it is incredibly compact and portable, fitting easily into a glove compartment, trunk, or even a backpack. It comes with a microfiber storage bag, adding to its convenience for storage and transport.

User Experience and Additional Functionality: The device features intuitive LED indicators that show the charge status, errors, and when it’s ready to boost. Using it is a straightforward three-step process: connect clamps, power on, and start the vehicle. For extremely low-voltage batteries (below 2 volts), a manual override feature allows you to force the boost function on, though this should be used with extreme care. Beyond jump-starting, the integrated 100-lumen LED flashlight provides essential illumination for nighttime emergencies, and the USB output allows for convenient charging of personal devices.

Charging and Battery Life: The GB40 charges via USB-C, which offers genuine convenience given the prevalence of USB-C chargers today. While it doesn’t typically come with a dedicated charging brick, it’s compatible with most USB-C fast chargers (45W or above is recommended for optimal speed). Once fully charged, it holds its charge exceptionally well, retaining up to 70% of its capacity for up to a year. Regular top-ups every 6-12 months are recommended to maintain peak performance.

Pros:

• Ultra-Safe Operation: Spark-proof, reverse polarity protection.
• Powerful: 1000 Peak Amps, suitable for most cars, SUVs, and light trucks.
• Highly Portable: Compact and lightweight design.
• Multi-functional: Built-in flashlight and USB charging ports.
• Durable: Rugged construction and IP65 water resistance.
• Excellent Charge Retention: Holds power for up to a year.

Cons:

• No Charging Brick Included: Requires a separate USB-C fast charger for optimal charging speed.
• Diesel Engine Limit: While good, larger diesel engines might require higher amperage models.
• Cold Weather Performance: Some anecdotal reports suggest a slight dip in performance in extremely frigid conditions, though still effective.

How to Use the NOCO Boost Plus GB40 Safely and Effectively

Using the NOCO Boost Plus GB40 is designed to be straightforward and safe, even for those unfamiliar with jump-starting a vehicle. Following these steps will ensure optimal performance and protect both you and your vehicle.

Before you begin, ensure the NOCO GB40 is adequately charged, ideally above 75% state of charge. Always wear protective eyewear and remove any metal jewelry when working around vehicle batteries. Make sure all vehicle power loads, such as headlights, radio, and air conditioning, are turned off to reduce strain on the battery during the jump-start process.

Step-by-Step Usage:

1. Connect Clamps to GB40: Firmly connect the heavy-duty battery clamps to the 12V OUT port on the GB40.
2. Attach to Vehicle Battery: Connect the positive (red) clamp to the positive (POS, P, +) battery terminal. Then, connect the negative (black) clamp to the negative (NEG, N, -) battery terminal or a suitable vehicle chassis ground point, away from the battery. The GB40’s UltraSafe technology will prevent sparks and errors, illuminating an error LED if connected incorrectly, prompting you to reverse the clamps.
3. Power On and Start: Press the Power Button on the GB40. All LEDs will flash briefly, then the white Boost LED will illuminate, indicating that the unit has detected the battery and is ready to jump start. Once the Boost LED is solid white, attempt to start your vehicle.
4. Disconnect: As soon as your vehicle starts, power off the GB40 unit. Disconnect the negative (black) clamp first, followed by the positive (red) clamp. Safely store your GB40 in its microfiber bag.

Maintenance and Storage:
To ensure your NOCO GB40 remains ready for action, recharge it every 6 to 12 months, even if it hasn’t been used. Store the unit in a cool, dry place, keeping its ports closed to maintain its IP65 water resistance rating. Avoid storing it in extremely hot or cold environments for prolonged periods, as this can affect battery life and performance.

Tips and Tricks When Using Your NOCO Boost Plus GB40

Even with a reliable tool like the NOCO Boost Plus GB40, a few additional tips can enhance your experience and preparedness. These insights can make a difference in challenging situations and help you maximize the utility of your jump starter.

When faced with a deeply discharged battery (below 2 volts), the GB40’s smart detection might not activate the boost mode automatically. In such rare cases, you can use the Manual Override feature by pressing and holding the Manual Override button for three seconds. This bypasses the safety checks and forces the unit to deliver power. Exercise extreme caution in this mode, ensuring correct clamp polarity before engaging. This is a powerful feature for stubborn cases but requires careful handling.

For optimal cold weather performance, try to keep your NOCO GB40 as warm as possible before use, especially if temperatures are consistently below freezing. While the unit is designed to operate in cold conditions (down to -4°F / -20°C), its internal lithium-ion battery will perform best when not subjected to extreme cold for extended periods. Storing it in the passenger compartment rather than a frigid trunk can make a noticeable difference. Remember that if your vehicle does not start after the first attempt, allow the GB40 to rest for fifteen minutes before trying again.

Beyond jump-starting, don’t forget the GB40’s versatility. The integrated 100-lumen LED flashlight with its various modes is invaluable for visibility during nighttime repairs or signaling for help. The USB charging ports can be a lifesaver for dead phones or other devices, especially during power outages or remote travel. Regularly checking these secondary functions ensures you’re fully prepared for any emergency.

NOCO Boost Plus GB40 – Frequently Asked Questions

What happens if I connect the NOCO GB40 clamps incorrectly?
The NOCO Boost Plus GB40 features UltraSafe technology with reverse polarity protection. If you connect the clamps backward, an error LED will illuminate red, and the unit will not deliver power. Simply reverse the connections to correct the error and proceed safely.

How long does the NOCO GB40 hold a charge?
The NOCO Boost Plus GB40 can hold up to 70% of its rated capacity for up to one year. For optimal performance and readiness, it is recommended to recharge the device at least every 6 to 12 months, even if it hasn’t been used.

Can the NOCO GB40 jump-start a completely dead battery?
Yes, the GB40 is designed to jump-start 12-volt lead-acid batteries down to 2 volts. If the battery is below 2 volts, the Boost LED might be off, indicating the unit cannot detect it. In such cases, you can use the manual override feature cautiously.

Is the NOCO GB40 waterproof?
The NOCO Boost Plus GB40 has an IP65 rating, meaning it is water-resistant and protected against dust ingress. This protects it from splashes and light rain, but it should not be submerged in water. Always ensure ports are closed for maximum protection.

What is included in the box with the NOCO GB40?
The NOCO Boost Plus GB40 typically includes the GB40 lithium battery jump starter unit, heavy-duty precision battery clamps, a 12V car charger, a micro USB cable (or USB-C on newer models), and a microfiber storage bag. A wall charging brick is generally not included.

Can I charge my phone with the NOCO GB40?
Absolutely. The NOCO Boost Plus GB40 features a USB output port (5V, 2.1 Amps Max) that allows you to recharge personal devices such as smartphones, tablets, e-watches, and more on the go, making it a versatile power bank.

“For drivers, especially those in older vehicles or cold climates, a reliable jump starter like the GB40 isn’t just a convenience; it’s a critical safety net that provides confidence on every journey.” – Sarah Jenkins, Automotive Service Manager

NOCO Boost Plus GB40 showing its flashlight and USB charging function in a car interior

Conclusion

The NOCO Boost Plus GB40 Jump Starter remains an exemplary device in 2026, offering a powerful, safe, and portable solution for dead vehicle batteries. Its 1000 Peak Amps, combined with the groundbreaking UltraSafe technology, ensures reliable starting power for a wide range of engines while virtually eliminating user error. The added utility of a bright LED flashlight and USB charging ports further cements its role as an indispensable emergency tool for any driver. While the absence of a dedicated wall charger is a minor inconvenience, the GB40’s robust build, impressive charge retention, and overall performance make it a standout choice that delivers exceptional value.

Investing in a NOCO Boost Plus GB40 is more than just buying a gadget; it’s buying peace of mind, knowing you’re prepared for unexpected roadside emergencies. Are you ready to empower your journeys with this essential automotive companion?