






NOCO Boost X GBX155 4250A Jump Starter
Description
AUTOMOTIVE EMERGENCY ESSENTIALS
12V 4250A Lithium Jump Starter & Power Bank
Powerful Starts. Portable Power. Added Confidence.
Be prepared for unexpected battery trouble with a powerful portable jump starter designed for compatible 12V vehicle batteries. USB-C charging and a built-in LED flashlight add useful functionality for road trips and roadside emergencies.

Power When You Need It Most
Keep a capable jump starter in your vehicle for unexpected battery issues. The compact, portable design brings emergency starting capability, device charging, and an LED flashlight together in one unit.
Powerful Features in One Portable Device
01. High-Power Emergency Jump Starting
With a peak starting current of 4250 amps, the GBX155 is designed for compatible 12V lead-acid vehicle batteries and demanding starting situations.
02. Supports Large Engines
Rated for gasoline engines up to 10.0 litres and diesel engines up to 8.0 litres. Actual suitability depends on the vehicle, battery condition, and operating conditions.
03. Fast USB-C Charging
USB-C Power Delivery supports input and output up to 60W with a compatible charger and cable. The unit can also charge compatible phones, tablets, and other USB-powered devices.
04. Built-In LED Flashlight
The integrated 500-lumen LED flashlight includes multiple lighting modes, including SOS and emergency strobe, for roadside situations and low-light use.
05. Integrated Safety Protection
The UltraSafe 2.0 system includes spark-proof technology and reverse-polarity protection to help reduce risks associated with incorrect clamp connections. Always follow the supplied instructions.

Be Prepared for Unexpected Battery Trouble
A portable jump starter can be a useful addition to your roadside emergency kit, helping you prepare for compatible 12V battery starting situations without relying solely on another vehicle.

Fast Charging, Less Waiting
USB-C Power Delivery supports charging rates up to 60W. With a compatible 60W USB-C PD charger, the reference specifications indicate a recharge time of approximately 2.7 hours. Actual charging time depends on the charger, cable, battery level, and conditions.

More Than a Jump Starter
Use the integrated power bank to charge compatible USB devices when you are travelling or away from a wall outlet.
Power Delivery up to 60W
Up to 10W output

Designed with Safety in Mind
Spark-proof technology and reverse-polarity protection are designed to help protect against common connection errors. Correct connection procedures and the manufacturer's safety instructions remain essential.

Light for the Unexpected
The integrated 500-lumen flashlight offers multiple modes, including SOS and emergency strobe, to help illuminate roadside tasks and other low-light situations.
Smart Power Conservation
The GBX155 uses a 60-second jump-start timeout. After activating the unit, begin the vehicle-starting procedure within the specified time window.
If the timeout expires, follow the manufacturer's instructions to switch the unit off and back on before starting another jump-start sequence.

What's Included
- GBX155 Lithium Jump Starter
- Integrated Heavy-Duty Precision Battery Clamps
- 24-inch USB-A to USB-C Cable
- 24-inch 12V to USB-C Charging Cable
- Microfiber Storage Bag
- Safety and Warranty Information
Please confirm the contents of your actual package before publishing this list.
Technical Specifications
| Model | GBX155 |
| Battery System | 12V Lead-Acid Vehicle Batteries |
| Peak Starting Current | 4250A |
| Gasoline Engine Rating | Up to 10.0L |
| Diesel Engine Rating | Up to 8.0L |
| Internal Battery | 99Wh Lithium-Ion |
| USB-C Input / Output | Up to 60W Power Delivery |
| USB-A Output | 5V, 2.1A Maximum / 10W |
| LED Flashlight | 500 Lumens |
| Housing Protection | IP65 with Ports Closed |
| Dimensions | 12.03 × 6.89 × 2.72 in 305.6 × 175 × 69.1 mm |
| Product Weight | 5.82 lb / 2.64 kg |
How to Use the Jump Starter
Step 1 — Connect the Clamps
With the vehicle and jump starter powered off, connect the clamps to the correct battery terminals as directed in the user manual.
Step 2 — Power On
Activate the unit and check the indicator lights. Ensure the clamps are connected correctly before attempting to start the vehicle.
Step 3 — Start the Vehicle
Follow the product instructions and attempt to start the vehicle within the 60-second operating window.
Step 4 — Disconnect Safely
After the vehicle starts, disconnect the clamps in the order specified in the manual and store the equipment safely.
Important: Always read the official instructions before use. Do not use the device on incompatible battery systems or damaged batteries.
Frequently Asked Questions
What vehicles can it support?
The GBX155 is designed for compatible 12V lead-acid vehicle batteries and is rated for gasoline engines up to 10.0L and diesel engines up to 8.0L. Always confirm compatibility with your vehicle.
Can it charge phones and other devices?
Yes. It includes USB-C Power Delivery up to 60W and USB-A output up to 10W for compatible devices.
Does it have a flashlight?
Yes. The integrated LED flashlight is rated at 500 lumens and offers multiple lighting modes, including SOS and emergency strobe.
How long does recharging take?
The reference specifications indicate approximately 2.7 hours with a compatible 60W USB-C Power Delivery charger. Charging time varies with the charger, cable, battery level, and conditions.
Is it waterproof?
The device is rated IP65 when the ports are closed. Follow the manufacturer's instructions and never submerge the unit in water.
Be Ready for the Unexpected
Keep powerful jump-starting capability, portable USB charging, and emergency lighting close at hand.
Get Prepared for Your Next Drive