4250 Amp UltraSafe Lithium Jump Starter

NOCO Boost X GBX155 is a portable lithium jump starter for 12-volt batteries in vehicles up to 10.0-liters gasoline and 8.0-liter diesel engines, including cars, motorcycles, trucks, ATVs, boats, RVs, vans, SUVs, tractors, and more.

An all-new design with extreme jump starting power for powerful engine starts. Rated at 4250-amps, this portable lithium car battery jump starter releases maximum energy at every start. This isn't an upgrade. It's a whole new series - the Extreme Series.
Equipped with USB-C technology that, combined with power delivery, gives you lightning-fast recharges. Completely recharges in just 2.7-hours, or go from 0% to jump starting in just 5-minutes of charge.
Charge everything with USB-C Power Delivery. Its internal power bank provides 60-watts of power - both in and out - to effortlessly power your favorite USB-C devices, like phones, tablets, laptops, wearables, and more.
We took our UltraSafe technology and made it better. It's still our simple, mistake-free design featuring spark-proof technology and reverse polarity protection, but with enhanced thermal efficiency and power management to provide better performance and longer battery life.
It's one of the most versatile lithium jump starters ever. Jump start all vehicle types, including cars, motorcycles, trucks, ATVs, boats, RVs, vans, SUVs, tractors, and more for up to 10.0-liter gasoline and 8.0-liter diesel engines.
WARNING: California’s Proposition 65

Technical Specifications

What's In The Box

GBX155 Lithium Jump Starter
Integrated HD Precision Battery Clamps
24in USB-A to USB-C Cable
24in 12V to USB-C Cable
Microfiber Storage Bag
Safety & Warranty Information

Starting Current

4250 Amps (Peak)

Battery Types

12 Volt Lead-Acid Batteries

Internal Battery

99 Watt-Hour Lithium-Ion

USB Input

USB-C: 5 Volts 1.5 Amps / 9 Volts 3 Amps / 12 Volts 3 Amps / 15 Volts 3 Amps / 20 Volts 3 Amps

USB Output

USB-A: 5 Volts 2.1 Amps Max / 10 Watts Max
USB-C: 5 Volts 3 Amps / 9 Volts 3 Amps / 12 Volts 3 Amps / 15 Volts 3 Amps / 20 Volts 3 Amps

Gas Engine Rating

Up to 10.0 Liters

Diesel Engine Rating

Up to 8.0 Liters

LED Flashlight

500 Lumens

Product Size

Height: 6.89 Inches (175.0 mm)
Width: 12.03 Inches (305.6 mm)
Depth: 2.72 Inches (69.1 mm)
Weight: 5.82 lbs (2.64 kg)

IP Rating

IP65 (w/ Ports Closed)

Limited Warranty

1-Year Hassle-Free Warranty