How to Jump Start using GBX155

How to Jump Start using GBX155

How to jump start using NOCO Boost X UltraSafe Lithium Jump Starter:

  1. Make sure all of the vehicle’s power loads (headlights, radio, air conditioning, etc.) are turned off before attempting to jump start the vehicle.
  2. Press the power button to begin jump starting, and all LEDs will flash once. If you are properly connected to the battery, the white boost LED will illuminate and the battery charge LEDs will chase. A 60-second timeout countdown will begin as soon as a battery is detected.
  3. Try starting the vehicle. Most vehicles will immediately start. If the vehicle does not start right away, wait 20-30 seconds and try again. After the 60-second timeout is complete, the unit must be powered off, then back on, to initiate a new jump-start sequence. Do not attempt more than five (5) consecutive jump starts within a fifteen (15) minute period. Allow the Boost X to rest for fifteen (15) minutes before attempting to jump start the vehicle again.
  4. Once you have started your vehicle, power off the unit, disconnect the battery clamps, and remove Boost X.

60-Second Timeout:A 60-second countdown will be initiated as soon as a battery is detected. After 60 seconds has elapsed, the jump starting function will be disabled. The boost LED will turn off and the internal battery charge LEDs will indicate the current charge level of the unit. To reset the jump-starting function, press the power button to power off the unit. Press the power button again to power on the unit and restart the jump starting function.

Low Voltage Batteries & Manual Override: Boost X is designed to jump start 12-volt lead-acid batteries down to 3-volts. If your battery is below 3-volts, the Boost LED will be «off». This is an indication that the Boost X can not detect a battery. If you need to jump start a battery below 3-volts there is a manual override feature, which allows you to force «on» the jump start function. Learn more about Manual Override.


Watch the video below to learn more.


Chat Monday thru Friday
8AM - 4PM MST
Average Response Within 1
Business Day
Request A Callback

Request A Callback

It's OK to respond via email for a faster response.

Click for emergency contact information.

Emergency Contact Information

1.800.456.6626 Monday thru Friday
8AM - 4PM MST

For non-urgent support, please Request A Callback
For Fastest Response, Use 'Chat' or 'Send a Message' Above
Write Us

The NOCO Company 30339 Diamond Parkway #102 Glenwillow, OH 44139-5400 United States of America

Request A Callback

Request A Callback

It's OK to respond via email for a faster response.

Click for emergency contact information.

Emergency Contact Information

1.800.456.6626 8AM-5PM (MST)
Monday-Friday
For non-urgent support, please Request A Callback
For Fastest Response, Use 'Chat' or 'Send a Message' Above