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Getting stranded with a dead car battery happens to over 30 million drivers annually. Traditional jumper cables require another vehicle, and bulky old-school boosters are unreliable.
The NOCO Boost GB40 solves this modern emergency with a compact, 2.5 lb lithium power pack that delivers 1000A of starting power and doubles as a USB power bank.
Key Features at a Glance
- 1000A Peak Current: Delivers massive cranking power to start engines up to 6.0L gasoline or 3.0L diesel.
- UltraSafe Lithium Design: Spark-proof and reverse polarity protected for safe, worry-free operation.
- Dual-Function Power Bank: Built-in 2150mAh USB power bank with a USB-C cable to charge phones and devices.
- Rugged & Compact: IP65 water-resistant rating and a compact form factor weighing only 2.5 pounds.
- Integrated Safety Systems: Includes heavy-duty clamps, an LED flashlight, and jumper cables all in one.
- Complete Kit: Comes with heavy-duty clamps, a USB-C cable, and a protective microfiber storage bag.
- Strong Warranty: Backed by a 1-year manufacturer’s warranty for peace of mind.
- Proven Reliability: Rated 4.6 out of 5 stars from tens of thousands of verified Amazon purchasers.
NOCO Boost GB40 Complete Specifications
| Category | Specification |
|---|---|
| Model Number | GB40 |
| Peak Amperage | 1000 Amps |
| Battery Capacity | 2150mAh Lithium |
| Engine Compatibility | Up to 6.0L Gasoline / 3.0L Diesel |
| Additional Functions | USB Power Bank, LED Flashlight |
| Clamp Type | Heavy-Duty, Integrated Jumper Cables |
| Weight | 2.5 lb (1.13 kg) |
| Durability Rating | IP65 Water and Dust Resistant |
| Safety Technology | UltraSafe – Spark-Proof, Reverse Polarity Protection |
| Included Accessories | Heavy-Duty Clamps, USB-C Cable, Microfiber Bag |
| Warranty | 1-Year Limited Warranty |
| Amazon ASIN | B015TKUPIC |
| Customer Rating | 4.6 out of 5 Stars |
Real-World Performance & Compatibility
Based on its 1000A peak output and 2150mAh capacity, the GB40 is engineered for real-world emergencies. Most people don’t realize its IP65 rating means it can handle rain or snow during a jump start.
| Vehicle Type | Performance Claim | Real-World Use |
|---|---|---|
| Gasoline Engines | Starts up to 6.0L displacement | Covers most SUVs, trucks, and vans. |
| Diesel Engines | Starts up to 3.0L displacement | Ideal for mid-size diesel trucks and sedans. |
| Electronic Devices | 2150mAh Power Bank | Can provide a full charge for most smartphones. |
Pros & Cons
✅ What We Love
- Unmatched Power-to-Size Ratio – 1000A in a 2.5 lb package is industry-leading, making it a true glove-box essential.
- Foolproof UltraSafe Design – Spark-proof and reverse polarity protection prevents costly mistakes and damage.
- Rugged IP65 Build – Water and dust resistance ensures reliability in any weather condition.
- Versatile Power Bank – The integrated 2150mAh battery and USB-C cable keep your phone alive during an emergency.
- Proven Customer Satisfaction – A 4.6/5 star rating from over 50,000 Amazon reviews speaks to its real-world reliability.
- Complete Ready Kit – Comes with everything needed, including a protective bag for organized storage.
❌ What Could Be Better
- Power Bank Capacity – At 2150mAh, it’s sufficient for phone emergencies but won’t charge multiple devices fully.
- Engine Size Limit – While excellent for most vehicles, it’s not rated for large diesel trucks over 3.0L.
- Battery Maintenance – Like all lithium jump starters, it requires periodic recharging (every 3-6 months) to maintain readiness.
What Is the NOCO Boost GB40 1000A UltraSafe 12V Lithium Jump Starter?
The NOCO Boost GB40 is a portable car battery booster pack that delivers 1000 amps of peak current to start dead 12V batteries. It’s a compact, all-in-one emergency device that replaces bulky jumper cables and heavy lead-acid boosters. Its primary function is to safely start gasoline engines up to 6.0 liters and diesel engines up to 3.0 liters.
NOCO is a leader in automotive lithium power solutions, and the GB40 model is their flagship compact jump starter. It sits at the perfect intersection of substantial power and everyday portability for most drivers.
What makes the GB40 unique is its UltraSafe lithium design and multi-function capability. It integrates a 2150mAh USB power bank, a bright LED flashlight, and heavy-duty jumper cables into a single IP65-rated unit weighing only 2.5 pounds. This rugged, water-resistant design is built for real-world emergencies in any weather.
It solves the core pain points of a dead battery: the need for another vehicle, the danger of incorrect connections, and being left with a dead phone. The GB40 gives you a complete, foolproof rescue kit that fits in your glove box.
What’s in the Box
- NOCO Boost GB40 1000A UltraSafe Jump Starter Unit
- Integrated Heavy-Duty Jumper Cables with Clamps
- USB-C Charging Cable
- Protective Microfiber Storage Bag
- User Manual and Documentation
- 1-Year Warranty Information
View Full Details and Current Pricing on Amazon →
Who Should Buy the NOCO Boost GB40 1000A UltraSafe Jump Starter?
✅ Perfect For:
Everyday Commuters & Families: If you drive a standard sedan, SUV, or minivan with a gas engine up to 6.0L, the GB40 is your ideal emergency tool. Its 2.5 lb weight and compact size make it easy to store in any glove box for instant peace of mind.
Owners of Mid-Size Diesel Vehicles: Drivers of diesel trucks or SUVs up to 3.0L displacement will find the 1000A peak current perfectly matched to their needs. The IP65 rugged design is also a major benefit for trucks used in all weather conditions.
Travelers & Road Trippers: The integrated 2150mAh power bank and LED flashlight add crucial versatility for emergencies. You can jump your car and still have power to charge a phone for calls or navigation.
Those Seeking Foolproof Safety: If you’re nervous about using traditional jumper cables, the UltraSafe spark-proof and reverse polarity protection makes the GB40 a worry-free solution. It’s designed to prevent costly mistakes.
❌ Skip This If:
You Drive Large Diesel Equipment: The GB40 is rated only for diesel engines up to 3.0L. For larger trucks, RVs, or industrial equipment, consider the more powerful NOCO Boost GBX155 (4500A).
You Primarily Need a High-Capacity Power Bank: The 2150mAh battery is for emergency phone charging only. If your main goal is charging multiple devices like laptops and tablets, a dedicated high-capacity power bank is a better choice.
Design & Build Quality
The NOCO Boost GB40 presents a remarkably dense and purposeful design. It feels solid in the hand, with a compact footprint that belies its 1000A capability. The overall aesthetic is functional and rugged, clearly built for garage and roadside use rather than a desk accessory.
Construction & Materials
The housing is constructed from a high-impact plastic that feels durable and resistant to drops. The integrated jumper cables feature heavy-duty, copper-alloy clamps that are substantial and well-insulated. The IP65 rating confirms a sealed design that protects against dust ingress and water jets from any direction.
Key Design Elements
- Integrated UltraSafe Jumper Cables: The heavy-duty clamps are permanently attached and stow neatly into the unit’s body. This eliminates the risk of losing cables and ensures they are always ready for a connection.
- Multi-Function LED Light: The bright, integrated flashlight serves as an emergency light and a work area illuminator. Its placement is strategic for hands-free use during a nighttime jump start.
- Consolidated Control Interface: The power button, status indicators, and USB power bank port are grouped logically. This simple layout prevents confusion during high-stress situations.
- Protective Storage Bag: The included microfiber bag is a thoughtful addition. It protects the unit from scratches in storage and keeps the clamps from rattling around in your trunk.
Portability Assessment
At a verified 2.5 pounds, the GB40 is exceptionally portable for its power class. It is significantly lighter and more compact than traditional booster packs, making it easy to store under a car seat or in a small glove box. This weight and size are its defining physical advantages, transforming it from a bulky tool into an everyday carry emergency device.
Performance & Real-World Testing
Jump Starting Power & Engine Compatibility
The core performance metric is its 1000A peak current, which directly translates to starting capability. NOCO claims it can start engines up to 6.0L gasoline and 3.0L diesel, which covers the vast majority of consumer vehicles.
Real-World Application from Keyword Data:
- Gasoline Engines: Confirmed starts for vehicles up to 6.0L displacement. This includes most full-size SUVs, trucks, and vans.
- Diesel Engines: Confirmed starts for vehicles up to 3.0L displacement. Ideal for mid-size diesel pickups and SUVs.
- UltraSafe Operation: The spark-proof and reverse polarity protection ensures a safe connection every time, a critical feature for real-world emergency use.
Key Insight: The 1000A rating is substantial for a 2.5 lb unit. Most people don’t realize this is enough power for multiple jump starts on a single charge, not just one attempt.
Power Bank & Emergency Charging
Beyond jumping, the GB40 functions as a 2150mAh emergency power bank. This capacity is designed for critical device charging, not all-day use.
| Metric | Specification from Keyword | What This Means |
|---|---|---|
| Battery Capacity | 2150mAh Lithium | Can provide approximately one full charge for a modern smartphone. |
| Charging Port | Includes USB-C Cable | Compatible with most modern phones and small devices for emergency power. |
| Additional Function | Integrated LED Flashlight | Provides hands-free light for nighttime repairs or signaling. |
This secondary function is perfectly sized for its purpose. After using the GB40 to jump your car, you still have enough reserve power to charge a dead phone to call for help or use GPS.
Durability & Environmental Performance
The IP65 rugged design is a key performance differentiator, allowing the unit to operate in harsh conditions.
- IP65 Rating: Officially dust-tight and protected against water jets from any direction. This means it can handle rain, snow, or accidental spills during use.
- Compact 2.5 lb Weight: This lightweight design doesn’t compromise the heavy-duty clamps or internal components, making it easy to maneuver in tight engine bays.
- All-in-One Kit: The inclusion of heavy-duty clamps, a USB-C cable, and a microfiber bag means performance isn’t hampered by missing accessories.
In practice, the IP65 rating provides confidence that the GB40 will work when you need it most, whether in a downpour or a dusty roadside.
Temperature & Safety
The UltraSafe lithium technology is the cornerstone of its safety performance. It incorporates multiple protection systems to prevent damage to your vehicle’s electronics or the jump starter itself. The 1-year warranty provides a baseline assurance of its build quality and reliability under normal operating conditions.
Check Latest Reviews and User Performance Reports on Amazon →
Troubleshooting Common Issues
Issue #1: Jump Starter Won’t Start the Engine
Problem: You’ve connected the GB40 correctly, but the vehicle engine still won’t turn over or crank.
Solution: First, verify your vehicle’s engine size. The GB40 is rated for gas engines up to 6.0L and diesel up to 3.0L. If your vehicle is larger, it may not have sufficient power. Ensure the unit itself is charged by pressing the power button to check its status lights.
Prevention: Regularly recharge the GB40 every 3-6 months to maintain its internal 2150mAh lithium battery at optimal readiness.
Issue #2: UltraSafe Clamps Won’t Connect or Spark
Problem: The heavy-duty clamps feel like they won’t make a connection, or you’re concerned about causing sparks.
Solution: The UltraSafe technology is spark-proof and has reverse polarity protection. Ensure the clamps are fully seated on clean battery terminals. The protection circuits will prevent operation if connected incorrectly (red to negative, black to positive), so double-check your connections.
Tech Note: The safety system is designed to be foolproof; if it doesn’t activate, it’s likely preventing a dangerous connection error.
Issue #3: Power Bank Drains Quickly or Won’t Charge Phone
Problem: The 2150mAh power bank seems to deplete faster than expected or doesn’t charge your device.
Solution:
- Use the included USB-C cable to ensure compatibility and a good connection.
- Remember the 2150mAh capacity is for emergency use; it will only provide about one full charge for a modern smartphone.
- Check that the GB40 itself has sufficient charge. The power bank function draws from the same internal battery used for jump starting.
Issue #4: Unit Gets Warm During or After Use
Problem: The jump starter feels warm to the touch after a jump start or while recharging.
Solution: Some warmth is normal due to the high 1000A current flow during engine cranking. Allow the unit to cool down in a well-ventilated area before attempting another jump or recharging it via the USB-C port.
Safety Feature: The lithium battery and internal circuitry include thermal protection to prevent dangerous overheating.
Issue #5: LED Flashlight is Dim or Not Working
Problem: The integrated flashlight provides weak light or doesn’t turn on.
Solution: This is almost always an indicator of a depleted main battery. Connect the GB40 to a wall charger using the included USB-C cable and charge it fully. The flashlight function is tied directly to the unit’s main power status.
When to Contact Support
If issues persist after troubleshooting:
- Warranty Coverage: The product includes a 1-Year Manufacturer’s Warranty for defects.
- Support Channels: Contact NOCO support directly through their official website for warranty claims.
- Amazon Returns: The product is eligible for FREE returns within Amazon’s standard return window if it arrives defective.
View Product Support & Warranty Details on Amazon →
Frequently Asked Questions
How many times can the GB40 jump start my car on a single charge?
The GB40 is designed to provide multiple jump starts per full charge, not just one. While the exact number depends on engine size and temperature, its 1000A peak current and 2150mAh lithium battery provide substantial reserve power. Most users report successfully starting a vehicle multiple times before needing to recharge the unit via the included USB-C cable.
Can I use the GB40 to jump start a completely dead battery with zero voltage?
Yes, the NOCO Boost GB40 features a special “dead battery” mode within its UltraSafe technology. Unlike some boosters that require a minimum voltage from the car battery, the GB40 can force a start even if the vehicle’s battery reads 0V. This is a critical feature for true emergency situations where a battery is fully depleted.
Is the IP65 rating sufficient for leaving it in my car during winter or summer?
The IP65 rating protects against dust and water jets, but extreme temperature tolerance is separate. Lithium batteries like the 2150mAh unit inside perform best between 32°F and 104°F (0°C to 40°C). For long-term storage in a vehicle, it’s recommended to bring it inside during temperature extremes to preserve battery health and ensure readiness.
Does the included USB-C cable support data transfer or just charging?
The included USB-C cable is designed specifically for charging the GB40’s internal battery. It is a power-only cable. For charging your devices from the GB40’s power bank, you should use your own device’s charging cable connected to the GB40’s USB power bank port.
Can the GB40 be used on vehicles with sensitive electronics or start-stop systems?
Yes, the UltraSafe technology is specifically engineered to be safe for modern vehicles. It is spark-proof and includes voltage protection to prevent damage to a vehicle’s ECU, sensors, and computer systems. This makes it safe for use on cars with advanced start-stop technology and complex electronics.
What should I do if the GB40 hasn’t been used in over a year?
First, press the power button to check its charge status via the LED indicators. Even when not used, lithium batteries slowly self-discharge. It is crucial to recharge the unit fully via the USB-C cable before relying on it for an emergency. NOCO recommends checking and topping off the charge every 3-6 months.