Introduction
The NOCO Boost X GBX45 is a portable lithium jump starter designed for 12-volt batteries in vehicles with up to 6.5-liter gasoline and 4.0-liter diesel engines. This includes cars, motorcycles, trucks, ATVs, boats, RVs, vans, SUVs, and tractors. Featuring 1250-amps of extreme jump starting power, the GBX45 incorporates UltraSafe 2.0 safety technology, providing spark-proof connections and reverse polarity protection. It also includes 60W USB-C Power Delivery for ultra-fast recharging and powering various USB-C devices. This manual provides essential information for safe and effective use of your GBX45.
Safety Information
Always read and understand all safety information before using this product. Failure to follow these safety instructions may result in electrical shock, explosion, fire, which may result in serious injury, death, or property damage.
- Battery Safety: The internal lithium-ion battery is designed for safe operation. Do not attempt to replace the battery. Do not expose the unit to fire or extreme heat.
- Operating Environment: Use the product in well-ventilated areas. Do not operate in explosive atmospheres, such as in the presence of flammable liquids, gases, or dust.
- Spark-Proof Technology: While designed to be spark-proof, always ensure proper connection to battery terminals. Avoid touching positive and negative clamps together.
- Children: Keep out of reach of children. This is not a toy.
- Medical Devices: Consult your physician before use if you have a medical device, such as a pacemaker.
- Proposition 65 Warning: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
What's in the Box

Image: All components included with the NOCO Boost X GBX45 jump starter.
Your NOCO Boost X GBX45 package includes the following items:
- GBX45 UltraSafe Portable Lithium Car Battery Booster Jump Starter Pack
- Heavy-Duty Jumper Cable Clamps (23 inches)
- USB-C Charging Cable (24 inches)
- Microfiber Storage Bag
- User Manual (this document)
- 1-Year Warranty Information
Features Overview

Image: The NOCO Boost X GBX45 unit with its attached heavy-duty clamps.
The GBX45 is engineered with advanced features for reliable and safe jump starting:
- Extreme Jump Starting Power: Rated at 1250-amps, capable of starting vehicles with up to 6.5L gas and 4.0L diesel engines.
- UltraSafe 2.0 Technology: Features spark-proof connections and reverse polarity protection for safe operation. Enhanced thermal efficiency and power management ensure better performance and longer battery life.
- USB-C Power Delivery (60W): Allows for ultra-fast recharging of the unit and powers various USB-C devices like phones, tablets, and laptops.
- Fast Recharging: Can go from 0% to jump starting in just 5 minutes of charge, with a full recharge in approximately 48 minutes using a compatible 60W charger.
- Integrated LED Flashlight: A 100-lumen LED flashlight with multiple modes, including SOS and strobe, for emergency situations.
- Portable Power Bank: Provides 10W USB-A output and 60W USB-C input/output for charging external devices.
Setup and Charging
Initial Charge
It is recommended to fully charge the GBX45 before first use. The unit comes partially charged from the factory. Use the included USB-C charging cable and a compatible USB-C power adapter (not included) to charge the unit. For fastest charging, a 60W USB-C Power Delivery adapter is recommended.

Image: Visual representation of the GBX45's fast charging feature, indicating 0% to boost in 5 minutes and full charge in 48 minutes.
- Connect the small end of the USB-C cable to the USB-C IN/OUT port on the GBX45.
- Connect the large end of the USB-C cable to a USB-C power adapter.
- Plug the power adapter into a wall outlet.
- The charge LEDs on the GBX45 will illuminate, indicating the charging progress. All five charge LEDs will be solid white when fully charged.
Battery Level Indicator
The charge LEDs indicate the internal battery charge level:
- 1 LED: 0-25%
- 2 LEDs: 25-50%
- 3 LEDs: 50-75%
- 4 LEDs: 75-100%
- 5 LEDs: 100% (Fully Charged)
Operating Instructions: Jump Starting a Vehicle
Follow these steps carefully to jump start your vehicle:

Image: The NOCO Boost X GBX45 connected to a vehicle battery, demonstrating its ability to start dead batteries.
- Connect Clamps: Connect the heavy-duty battery clamps to the GBX45. Ensure a secure connection.
- Attach to Battery:
- Connect the RED positive (+) clamp to the positive battery terminal.
- Connect the BLACK negative (-) clamp to the negative battery terminal or a chassis ground point.
The GBX45 features UltraSafe 2.0 technology with spark-proof and reverse polarity protection. If connected incorrectly, the Error LED will illuminate.
- Power On: Press the Power Button on the GBX45. The Power LED will illuminate white. The Boost LED will also illuminate white, indicating it's ready to boost.
- Start Vehicle: Attempt to start your vehicle. Most vehicles will start immediately. If the vehicle does not start, wait 30 seconds and try again. Do not attempt more than five (5) consecutive jump starts within a fifteen (15) minute period.
- Disconnect: Once the vehicle starts, disconnect the battery clamps in reverse order (negative first, then positive).
Manual Override Feature
The GBX45 has a manual override feature for extremely dead batteries where the unit may not detect the battery. Use this feature with extreme caution as safety features are disabled.
- Ensure clamps are correctly connected to the battery.
- Press and hold the Manual Override Button for three (3) seconds. The Boost LED will flash white.
- Attempt to start the vehicle.
- Disconnect clamps immediately after starting.
Charging External Devices (Power Bank Function)
The GBX45 can also function as a portable power bank to charge your USB devices.

Image: The GBX45 unit connected to and charging multiple electronic devices, highlighting its power bank capabilities.
- USB-A Output (10W): Connect your USB-A charging cable to the USB OUT port on the GBX45 and to your device.
- USB-C Input/Output (60W): Connect your USB-C charging cable to the USB-C IN/OUT port on the GBX45 and to your device. This port supports faster charging for compatible devices.
The GBX45 will automatically detect and begin charging your connected device. The charge LEDs will indicate the remaining battery level of the GBX45.
Maintenance and Storage
- Charging: For optimal battery life, fully charge the GBX45 every 2-3 months, even if not in use.
- Cleaning: Clean the unit with a soft, dry cloth. Do not use harsh chemicals or abrasive materials.
- Storage: Store the unit in a cool, dry place, away from direct sunlight and extreme temperatures. Use the included microfiber storage bag to protect the unit.
- Clamp Care: Keep the battery clamps clean and free of corrosion.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Unit does not turn on. | Battery is completely discharged. | Charge the unit using the USB-C cable. |
| Boost LED does not illuminate. | Clamps not connected properly; battery voltage too low. | Ensure clamps are securely connected. Use Manual Override if battery is extremely dead. |
| Error LED blinks (Reverse Polarity). | Clamps are connected in reverse. | Disconnect clamps and reconnect positive to positive, negative to negative. |
| Error LED blinks (Hot/Cold). | Unit is too hot or too cold. | Allow unit to return to operating temperature (-4°F to +122°F / -20°C to +50°C). |
| Vehicle does not start after multiple attempts. | Vehicle battery severely damaged; other vehicle issues. | Consult a professional mechanic. The GBX45 may not be able to start a battery with internal damage. |
Specifications
| Specification | Detail |
|---|---|
| Model | GBX45 |
| Peak Amperage | 1250 Amps |
| Battery Voltage | 12V |
| Engine Compatibility (Gas) | Up to 6.5 Liters |
| Engine Compatibility (Diesel) | Up to 4.0 Liters |
| Internal Battery | Lithium-Ion |
| USB-C Input/Output | 60W Power Delivery |
| USB-A Output | 10W |
| LED Flashlight | 100 Lumens (Multiple Modes) |
| Operating Temperature | -4°F to +122°F (-20°C to +50°C) |
| Dimensions (L x W x H) | 8.23" x 4.96" x 3.62" |
| Weight | 2.64 pounds (1.2 Kilograms) |
| Cable Length | 23 Inches (Jumper Cables) |
Warranty and Support
The NOCO Boost X GBX45 comes with a 1-Year Limited Warranty from the date of purchase. This warranty covers defects in material and workmanship under normal use. For full warranty terms and conditions, please refer to the official NOCO website or the warranty card included in your product packaging.
For technical support, troubleshooting assistance, or warranty claims, please contact NOCO Customer Service. You can find contact information and additional resources on the official NOCO website: no.co/support
You can also visit the official NOCO Store on Amazon for more products and information: NOCO Amazon Store





