NOCO Boost Plus GB40 Review: The #1 Best-Selling Jump Starter You Need in Your Car?

NOCO Boost Plus GB40 Jump Starter Review

There are few things that cause instant dread like turning the key in your car's ignition and hearing nothing but a faint click. A dead battery can derail your day, leaving you stranded and at the mercy of finding a kind stranger with jumper cables. But in an era of self-reliance and smart technology, waiting for help is an outdated concept.

Enter the NOCO Boost Plus GB40, a compact, powerful, and incredibly safe lithium jump starter that has become the #1 best-seller in its category. This isn't your father's bulky, intimidating battery charger. It's a pocket-sized lifesaver that promises to get you back on the road in seconds, without any sparks, risks, or technical knowledge. This in-depth review explores why the GB40 is considered an essential piece of emergency gear for every modern driver.

NOCO Boost Plus GB40 UltraSafe Car Battery Jump Starter

Why a Modern Jump Starter is Better Than Jumper Cables

For decades, the only solution for a dead battery was a set of cumbersome jumper cables and a second, running vehicle. This method is not only inconvenient but also surprisingly risky if done incorrectly. Modern lithium jump starters like the GB40 have made this process obsolete.

Feature NOCO GB40 (Modern) Jumper Cables (Traditional)
Safety Spark-proof and has reverse polarity protection. Impossible to mess up. Can create dangerous sparks if connected incorrectly or if cables touch.
Convenience Completely self-contained. No second vehicle needed. Requires finding another car and driver willing to help.
Portability Small enough to fit in a glove box. Bulky, heavy, and can get tangled.
Versatility Doubles as a power bank for USB devices and an emergency flashlight. Only has one function.
A modern jump starter isn't just a tool; it's an insurance policy. It provides independence and peace of mind, ensuring you are never truly stranded.

A Deep Dive into the NOCO GB40's Features

The GB40's popularity isn't an accident. It's the result of smart engineering that focuses on power, safety, and real-world usability.

1. The Power: 1000 Amps of Cranking Power

The 1000-amp peak current gives the GB40 enough power to start most everyday vehicles. According to NOCO, this is sufficient for:

  • Gasoline engines up to 6.0 Liters.
  • Diesel engines up to 3.0 Liters.

This covers the vast majority of cars, trucks, SUVs, boats, and motorcycles. On a single full charge, it can deliver up to 20 jump starts.

Infographic showing the types of engines the NOCO GB40 can start
The GB40 is powerful enough for most consumer vehicles, from cars to boats.

2. "UltraSafe 2.0" Technology: The Safety Net

This is arguably the most important feature. Many people are hesitant to jump-start a car for fear of creating sparks or damaging the vehicle's electronics. NOCO's UltraSafe technology eliminates this risk completely.

  • Spark-Proof: The clamps will not deliver power unless they are correctly connected to a battery, preventing accidental sparks.
  • Reverse Polarity Protection: If you accidentally connect the red clamp to the negative terminal and the black clamp to the positive, nothing bad happens. The device simply indicates an error with a light, and you can correct it without any danger.
Demonstration of the spark-proof and reverse polarity protection features
The UltraSafe technology makes it impossible to connect the clamps incorrectly and dangerously.

3. More Than a Jump Starter: A Versatile Power Bank

The GB40 isn't a one-trick pony. It includes a USB output port, allowing it to function as a portable power bank. You can use it to recharge your smartphone, tablet, or any other USB-powered device, which is incredibly useful during a power outage or while on the road.

4. The Built-in Emergency Flashlight

A dead battery often happens at the worst possible time—at night or in a poorly lit area. The GB40 features a bright, 100-lumen LED flashlight with seven different modes, including:

  • Solid brightness (at 100%, 50%, and 10%).
  • Emergency SOS and Strobe modes for signaling for help.
The NOCO GB40's powerful built-in LED flashlight
The integrated flashlight is a genuinely useful feature for nighttime emergencies.

How to Use the NOCO GB40 in 4 Simple Steps

Using the GB40 is incredibly straightforward, even for someone with zero car knowledge.

  1. Connect the Clamps: First, connect the GB40's clamps to the device itself. Then, attach the red clamp to the positive (+) battery terminal and the black clamp to the negative (-) terminal.
  2. Power On: Press the power button on the GB40. The white power LEDs will light up. If you've connected it correctly, you're good to go. If not, an error light will alert you.
  3. Start Your Vehicle: Attempt to start your car. It should turn over immediately.
  4. Disconnect: Once the car is running, turn off the GB40 and disconnect the clamps from the battery, starting with the black (-) clamp first.
Manual Override: In rare cases with extremely dead batteries (below 2-volts), the GB40 might not detect the battery. There is a manual override mode for these situations, but it disables the safety features, so it should only be used as a last resort by those who understand the risks.
A visual guide on how to connect the NOCO GB40 to a car battery
The process is simple: connect, power on, start the car, and disconnect.

Technical Specifications

Brand NOCO
Model Boost Plus GB40
Peak Current Rating 1000 Amps
Compatible Engines Gas up to 6.0L, Diesel up to 3.0L
Jump Starts Per Charge Up to 20
Internal Battery Lithium-Ion
USB Output Yes (for charging devices)
Flashlight 100 Lumen LED with 7 modes

Pros and Cons: The Honest Breakdown

Pros

  • Extremely Safe: Spark-proof and reverse-polarity protection make it foolproof.
  • Powerful & Reliable: Starts most consumer vehicles with ease.
  • Ultra-Portable: Compact design fits easily in a glove compartment.
  • Multi-Functional: Acts as a power bank and an emergency flashlight.
  • Incredibly Easy to Use: No technical skill required.
  • Holds a Charge: Can hold its charge for over a year in your car.

Cons

  • Slower USB Charging: The USB output is not as fast as modern dedicated power banks.
  • Higher Price: Costs more than generic, less-safe alternatives.
  • Micro-USB Charging: Uses an older Micro-USB standard to recharge itself, not USB-C.
A lifestyle shot showing the NOCO GB40 as part of an emergency car kit
The GB40 is an essential component of any well-prepared driver's emergency kit.

Frequently Asked Questions

Can I leave the GB40 in my car during hot summers or cold winters?
Yes. The GB40 is designed to be stored in a vehicle and has an operating temperature range of -4°F to 122°F (-20°C to 50°C).
How often do I need to recharge it?
It's recommended to check and recharge the GB40 every 6 to 12 months to ensure it's ready when you need it. It loses very little charge over time.
Will it damage my car's computer or electronics?
No. The UltraSafe technology is specifically designed to prevent voltage spikes and short circuits, making it safe for all modern vehicles with sensitive electronics.

Final Verdict

The NOCO Boost Plus GB40 is not just a gadget; it's a fundamental piece of safety equipment. It takes a stressful, potentially dangerous situation and turns it into a minor, 2-minute inconvenience. Its design genius lies in its simplicity and, above all, its safety.

While you might find cheaper alternatives, you are paying for NOCO's proven reliability and its industry-leading safety technology. For the peace of mind it provides, the price is more than justified. For any driver—from daily commuters to weekend road-trippers—the GB40 is one of the smartest investments you can make for your vehicle and your personal safety.