NOCO Boost Max GB250 5250A 12V Jump Starter — 16L Engine Capacity, Portable Power Bank & UltraSafe Protection

The NOCO Boost Max GB250 is a professional-grade 5250-amp 12V lithium jump starter that quickly revives gasoline and diesel engines up to 16 liters while also serving as a portable power bank and emergency light.

Designed for commercial fleets, heavy equipment operators, and emergency responders, the GB250 packs exceptional starting power into a surprisingly compact 15-pound housing. Its UltraSafe circuitry prevents sparks and reverses-polarity mistakes, and the unit includes a fast 56W charger, four international AC cords, interchangeable XGC adapters, and a rugged EVA carry case—giving technicians dependable performance wherever large engines must be restarted.

How much engine capacity can this starter handle?

The GB250 delivers a peak of 5,250 amps, engineered to start the largest 12V diesel and gasoline engines used in heavy industry. It’s specified for engines up to 16 liters, covering Class 8 trucks, buses, motorhomes, agricultural machinery, construction equipment, mining vehicles, and other vocational applications.

• Starts 6-, 8-, 12-, and 16-cylinder 12V engines
• Rated for engines up to 16L displacement
• Suitable for commercial and industrial vehicle fleets

What safety features protect users during jump starts?

NOCO’s UltraSafe technology integrates spark-proof clamps and automatic reverse-polarity protection so connections can be made quickly with reduced risk of user error. The electrical safeguards allow technicians to operate in busy or dim work zones with confidence.

• Spark-proof clamps to reduce arc hazards
• Reverse-polarity detection to prevent damage from incorrect hook-up
• Built-in smart electronics that manage current for safe cranking

What additional tools and charging options does the GB250 provide?

Beyond jump-starting, the GB250 functions as a portable power bank with integrated USB output to recharge phones, tablets, and essential electronics. It recharges fully in about four hours using the included 56W XGC power adapter and ships with interchangeable AC cords for global use.

• Integrated USB output for smartphones and accessories
• 56W fast charging adapter included—full recharge ≈ 4 hours
• AC cords for AU, EU, US, and UK outlets plus XGC extension adapters

How does the built-in LED flashlight help in the field?

The GB250 includes a precision 600-lumen LED light with seven modes, giving you functional illumination for roadside work, inspections, or emergencies. Multiple modes include steady high, low, SOS, and strobe so operators can adapt lighting to the situation.

• 600-lumen output for clear visibility in low light
• Seven modes: high, medium, low, SOS, strobe and more
• Useful for roadside repairs, emergency signaling, and close work

Who is this product for? The NOCO Boost Max GB250 is built for professionals and serious operators who need reliable, high-capacity starting power for the largest 12V engines. Fleet managers, heavy equipment technicians, tow operators, emergency responders, and off-grid vehicle owners will appreciate the compact weight, rapid recharge, global charging accessories, and UltraSafe protections. Packaged with a durable EVA case and backed by a one-year limited warranty, the GB250 is a service-grade tool intended for situations where dependable engine starts and emergency power are mission-critical.