Introduction
The NOCO Boost X GBX75 is a powerful and versatile 2500A UltraSafe lithium jump starter designed for 12V lead-acid batteries. It is capable of starting gas engines up to 8.5 liters and diesel engines up to 6.5 liters. Beyond jump starting, it functions as a portable power bank for USB-C and USB-A devices and features an integrated LED flashlight. This manual provides essential information for the safe and effective use of your GBX75.
What's in the Box
- GBX75 UltraSafe Portable Lithium Car Battery Booster Jump Starter Pack
- Power Bank with 60W USB-C Power Delivery
- Heavy-Duty Jumper Cable Clamps
- USB-C Charging Cable
- 12V USB-C Fast Charger
- Microfiber Storage Bag
- 1-Year Warranty

Figure 1: Included items with the NOCO Boost X GBX75.
Safety Information
Always read and understand the user manual completely before operating the GBX75. This device incorporates UltraSafe 2.0 technology for spark-proof connections and reverse polarity protection. However, improper use can still lead to hazards. Always wear eye protection and gloves when working with batteries. Keep out of reach of children. This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
Setup
Initial Charging
Before first use, fully charge the GBX75. It can be recharged in just 1.8 hours via USB-C Power Delivery. Use the included USB-C charging cable and 12V USB-C Fast Charger, or any compatible 60-watt USB-C Power Delivery charger.

Figure 2: The GBX75 supports fast charging via USB-C.
Product Overview Video
Video 1: An official product video showcasing the NOCO Boost X GBX75, highlighting its design and various features. This video provides a visual overview of the device and its components.
Operating Instructions
Jump Starting a Vehicle
- Attach Clamps: Connect the heavy-duty clamps to the GBX75. Ensure the clamps are clean and free of debris. Connect the red positive (+) clamp to the positive battery terminal and the black negative (-) clamp to the negative battery terminal or a suitable chassis ground point.
- Power On: Press the Power Button on the GBX75. The unit will perform a self-check and indicate the battery status. If the battery is completely depleted, you may need to use the Manual Override feature (refer to the full user manual for details).
- Start Vehicle: Attempt to start your vehicle. The GBX75 is designed to deliver maximum power for up to 60 seconds. If the vehicle does not start within this time, power off the GBX75, wait a few minutes, and try again.
- Detach & Go: Once the vehicle starts, power off the GBX75. Disconnect the negative (-) clamp first, followed by the positive (+) clamp. Store the GBX75 in its microfiber bag.

Figure 3: Jump starting a vehicle with the GBX75.

Figure 4: UltraSafe 2.0 technology ensures spark-proof and reverse polarity protected connections.
Charging External Devices
The GBX75 features a 60-watt USB-C Power Delivery port for both input and output, and a 10-watt USB-A output port. This allows you to charge various devices such as phones, tablets, and laptops.
- Connect your device's charging cable to the appropriate USB-C or USB-A port on the GBX75.
- The GBX75 will automatically begin charging your device.

Figure 5: The GBX75 can charge a variety of electronic devices.
Integrated LED Flashlight
The GBX75 includes a precision-engineered 400-lumen LED flashlight with seven modes, including SOS and strobe. This is useful for illuminating dark workspaces or for roadside emergencies.
- Press the flashlight button to cycle through the different light modes.
- Modes include 100%, 50%, 10% brightness, SOS, Blink, and Strobe.

Figure 6: The GBX75 features a powerful multi-mode LED flashlight.
Maintenance
To ensure the longevity and optimal performance of your GBX75, follow these maintenance guidelines:
- Recharge Regularly: Keep the GBX75 fully charged when not in use. Recharge it after every use and at least every 3-6 months to maintain battery health.
- Cleanliness: Keep the unit and its clamps clean and free of dirt, dust, and moisture. Use a dry, soft cloth for cleaning.
- Storage: Store the GBX75 in a cool, dry place, away from direct sunlight and extreme temperatures. Use the provided microfiber storage bag for protection.
Troubleshooting
If you encounter issues with your GBX75, refer to the following common troubleshooting tips. For detailed error codes and solutions, please consult the full user manual (link provided in the Warranty & Support section).
- Unit Not Turning On: Ensure the unit is charged. If completely depleted, it may require a few minutes of charging before it can power on.
- Error Lights: The GBX75 has various indicator lights for different conditions (e.g., reverse polarity, hot/cold battery, general error). Refer to the full manual to interpret these lights and take appropriate action.
- Vehicle Not Starting: Ensure clamps are securely connected to the correct battery terminals. The vehicle's battery might be too severely discharged, requiring the Manual Override feature.
Specifications
| Specification | Value |
|---|---|
| Brand | NOCO |
| Model | GBX75 |
| Peak Output Current | 2500 Amps |
| Product Dimensions | 7.28"D x 4.84"W x 9.8"H |
| Item Weight | 5 Pounds |
| Engine Compatibility (Gas) | Up to 8.5 Liters |
| Engine Compatibility (Diesel) | Up to 6.5 Liters |
| USB-C Power Delivery (Input/Output) | 60 Watts |
| USB-A Output | 10 Watts |
| LED Flashlight | 400 Lumens (7 Modes) |
| Battery Type | 74Wh Lithium-Ion |
| Operating Temperature | -20°C to 50°C |
Warranty and Support
The NOCO Boost X GBX75 is backed by a 1-year limited warranty. For detailed warranty information, technical support, or to download the complete user manual in PDF format, please visit the official NOCO website or refer to the provided PDF document:





