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NOCO Boost X 12v 4250 Amp Ultrasafe Lithium Jump Starter

Was: $439.95
Sale Price: $349.95
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Product InformationStore Part Number: GBX155


The NOCO Boost X GBX155 is a 12v 4250 Amp UltraSafe Lithium Jump Starter. The GBX155 can operate in cold weather as low as -4°F and in hot weather as warm as 122°F. The GBX155 is designed to start gas vehicles with an engine size up to 10.0L and diesel engines up to 8.0L.

The GBX155 features fast USB-C charging technology when using a USB-C 60 Watts charger*. This fast charging technology will allow you to charge the lithium battery pack within 2.7 hours. The fast recharge time also allows the unit to go from a 0% charge to jumping a vehicle in as little as 5 minutes.

The GBX155 features spark-free hookup technology and Reverse Polarity Protection! For Excessively discharged batteries below 3-volts the GBX155 features a Manual Output. This mode forces the GBX155 to output allowing you to start the engine when connected to an excessively discharged battery.

Whats Included:

  • GBX155 Lithium Jump Pack
  • Integrated HD Precision Battery Clamps
  • 24" USB-A to USB-C Cable
  • 24in 12V to USB-C Cable
  • Microfiber Storage Bag


  • Rated at 4250 Amps!
  • Designed for Gas Engines up to 10.0L and Diesel Engines up to 8.0L.
  • Fast USB-C Charging Technology: From 0% charge to starting a vehicle in as little as 5 minutes!
  • Automatic Power Saver: 60-Second Safety Timer requires you to jump the vehicle within 60 seconds. Should additional jumps be needed the unit can be reset.
  • 1-Year Warranty


*Charging time will vary depending on charging brick used. Charging brick is not included, USB-C compliant recommended by manufacturer. The GBX155 will timeout if charge hasn't been completed within 34 hours at which point you can simply disconnect and then reconnect the charging cord. Please see the following guide for estimated charge times:

Recharge Time    Charger Rating  
64-Hr 2.5 Watt
32-Hr 5 Watt
16-Hr 10 Watt
2.7-Hr 60 Watt

Tech Specs

  • Dimensions (LxWxH): 12.03 x 6.90 x 2.72 in
  • Weight: 5.82 lb
  • Shipping Weight: 8 lb
  • DC Output System Voltage: 12v
  • Safe For: Lead-Acid Batteries
  • Model: GBX155
  • Manufacturer: NOCO
  • Starting Current: 4250 Amps
  • Internal Battery: 99 Wh
  • Operating Temperature: 4ºF to 122ºF
  • Charging Temperature: 32°F to 104°F
  • Warranty: 12 Month
  • Manufacturer Part #: GBX155
  • UPC: 046221200096
  • Made In: Maylasia

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Specification Sheet

Order Line: 1-800-362-5397
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