NOCO Boost X GBX155 4250A Jump Starter — 12V Portable Power Bank & UltraSafe Boost

The NOCO Boost X GBX155 is a high-output 12V lithium jump starter that delivers 4,250 amps to start gas engines up to 10.0L and diesel engines up to 8.0L while doubling as a 60W USB-C power bank and emergency light source.

The GBX155 is engineered for demanding use: a compact, rugged booster that combines rapid-start capability, advanced safety features, and multi-device charging in one handheld unit. Its upgraded safety electronics prevent sparks and reverse polarity events, and a fast USB-C Power Delivery system refuels the internal battery quickly. Whether you need dependable roadside assistance, a portable charger for devices, or a compact emergency light, this unit aims to cover all three without sacrificing size or performance.

How much starting power does the Boost X provide?

The GBX155 produces a peak output of 4,250 amps, designed for large-displacement engines. That rating supports gas engines up to 10.0 liters and diesel engines up to 8.0 liters, making it suitable for most cars, trucks, SUVs, and some commercial vehicles.

• 4,250A peak output for high-compression engines
• Rated to start up to 10.0L gasoline and 8.0L diesel engines
• Delivers up to 18 jumps per full charge under typical conditions
• Integrated 60-second timer conserves energy on each attempt

Is the GBX155 safe and easy to use for non-professionals?

Yes — NOCO’s UltraSafe 2.0 circuitry adds multiple protective layers so users can connect clamps without worry. The clamps are spark-proof and the system blocks reverse polarity and overtemperature events, reducing user error risk during a jump-start.

• Spark-proof clamp design to avoid accidental ignition
• Reverse polarity protection prevents incorrect connections
• Thermal management and power control extend battery life
• Clear LED indicators guide status and charging progress

How fast does the unit recharge and function as a power bank?

The internal battery supports bidirectional 60W USB-C Power Delivery for both charging the unit and powering external devices. From empty, the GBX155 can gain enough energy for a single jump in about five minutes and fully recharge in roughly 2.7 hours using a compatible PD charger.

• 60W USB-C PD input/output for rapid recharge and device charging
• Fast 5-minute boost capability from a depleted state
• Full recharge time around 2.7 hours with Power Delivery
• Can fast-charge phones, tablets, and many laptops on the go

What emergency features and accessories are included?

The GBX155 integrates a bright LED flashlight with multiple modes to assist roadside repairs or signal for help. The kit ships with heavy-duty clamps, a USB-C cable, and a microfiber bag for storage, making it a ready-to-use package straight from the box.

• 500-lumen LED with seven modes including SOS and strobe
• Heavy-duty jumper clamps for reliable clamp-to-battery contact
• USB-C charging cable and compact storage pouch included
• Backed by a one-year limited warranty and engineered in the USA

Who is this for? The NOCO Boost X GBX155 is intended for drivers who want a compact but powerful jump starter that handles large engines, outdoor enthusiasts who need both vehicle support and device charging, and professionals who require dependable emergency gear. It’s ideal for anyone who values fast recharge, enhanced safety protections, and a multi-use tool that fits in a trunk, service vehicle, or workshop.