How to Use NOCO Boost GB40 Jump Starter

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Introduction

The NOCO Boost GB40 is a 12V lithium-ion jump starter designed to safely start dead batteries in cars, motorcycles, trucks, ATVs, boats, and more. It is compact, easy to use, and provides up to 1,000 amps for jump-starting engines up to 6.0L gasoline or 3.0L diesel.

This guide will walk you through how to use the NOCO Boost GB40 safely and effectively.

Features of NOCO Boost GB40

✔ 1,000-amp peak current – Jump-starts most vehicles with a dead battery.
✔ Safe Spark-Proof Design – Prevents accidental sparks.
✔ Reverse Polarity Protection – Protects against incorrect connections.
✔ Integrated LED Flashlight – Includes different brightness levels and emergency SOS mode.
✔ USB Charging Port – Can charge phones, tablets, and other USB devices.

Step-by-Step Guide to Using the NOCO Boost GB40

Step 1: Charge the NOCO Boost GB40 Before Use

  • Ensure the GB40 is fully charged before attempting to jump-start a vehicle.
  • Connect the USB cable to a wall adapter or car charger.
  • The four LED indicator lights on the device will show charging progress.
  • A solid green light indicates a full charge (may take up to 3 hours).

Step 2: Connect the NOCO GB40 to the Battery

  1. Turn off all electronics in the vehicle (lights, radio, AC, etc.).
  2. Attach the clamps to the battery terminals:
    • Red clamp (+) to the positive (+) terminal.
    • Black clamp (-) to the negative (-) terminal or an unpainted metal surface for grounding.
  3. The boost LED indicator should turn white, signaling a proper connection.

🚨 If the LED is flashing red, the clamps are reversed. Swap them before proceeding.

Step 3: Activate the Boost Function (If Needed)

  • If the battery is extremely dead (below 2V), the GB40 may not detect it automatically.
  • Press and hold the Boost button (⚡) for 3 seconds until the white LED light stays solid.
  • This forces the GB40 to deliver power, overriding safety features.

⚠️ Use the Boost function only if the normal jump-start process doesn’t work.

Step 4: Start the Vehicle

  1. Once connected properly, attempt to start the engine.
  2. If the car doesn’t start within 5 seconds, wait 30-60 seconds before trying again.
  3. If the vehicle still won’t start, double-check connections and retry.

Step 5: Disconnect the GB40 After Starting

  1. Turn off the GB40 by pressing the power button.
  2. Remove the black clamp (-) first, then the red clamp (+).
  3. Store the GB40 in a dry, cool place until the next use.

Using the NOCO GB40 as a Power Bank

✔ The USB output port allows charging of phones, tablets, and devices.
✔ Simply connect a USB cable to the 5V/2.1A output port and charge like a normal power bank.

LED Flashlight Mode

✔ Press and hold the flashlight button to activate.
✔ Cycle through low, medium, high, strobe, and SOS modes by pressing the button.

Common Problems and Troubleshooting

IssueSolution
GB40 doesn’t turn onEnsure it’s charged and hold the power button for 3 seconds.
No power to batteryPress the Boost button to override safety mode.
Flashing red LEDReverse clamp polarity detected – swap the clamps.
Car doesn’t startCheck connections and retry after 30-60 seconds.

Conclusion

The NOCO Boost GB40 is a powerful and easy-to-use jump starter that can quickly revive dead batteries. By following proper connection steps and safety precautions, you can jump-start your vehicle confidently. Always ensure the GB40 is fully charged and stored in your car for emergencies.

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