NOCO Boost Max GB250+ 5250 Amp 12V UltraSafe Portable Lithium Jump Starter Kit is a commercial-grade 5,250A peak lithium-ion jump starter engineered for 12V lead-acid batteries including AGM, wet cell, gel, maintenance-free, and enhanced flooded systems .
Designed to start gasoline and diesel engines up to 16 liters , including Class 8 semi-trucks, motorhomes, buses, agricultural, construction, mining, and vocational equipment.
Features 242Wh internal battery, IP65-rated housing (ports closed), 600-lumen LED worklight, dual 2.1A USB outputs, integrated digital voltmeter, 24" heavy-duty clamps, and global 56W charger with interchangeable AC cords.
Heavy-Duty 5,250 Amp Starting Power for 12V Gas & Diesel Engines
The GB250+ delivers an impressive 5,250 amps of peak current, providing the power required to start large displacement 6, 8, 12, and 16-cylinder engines up to 16 liters.
Built for fleet operators, marine service techs, heavy equipment operators, RV owners, and commercial drivers, this unit is purpose-built for demanding professional applications where reliability matters.
Specifications
Application: 12V lead-acid battery systems
Battery types: Wet, Gel, Maintenance-Free, EFB, AGM
Peak starting current: 5,250 amps
Engine capacity: Up to 16L gas & diesel
Internal battery: 242Wh lithium-ion
USB output: 2.1A
LED output: 600 lumens
IP rating: IP65 (ports closed)
Operating temp: -4°F to 122°F
Dimensions: 12-1/2" x 14-3/4" x 3-3/4"
Weight: 14.7 lbs
Engine & Vehicle Compatibility
Gasoline and diesel engines up to 16 liters
Class 8 semi-trucks and commercial tractors
Motorhomes, RVs, coaches, and buses
Agricultural, mining, and construction equipment
12V lead-acid batteries: wet, gel, MF, EFB, AGM
UltraSafe Lithium Technology with Advanced Protection
Engineered with NOCO’s UltraSafe technology, the GB250+ is spark-proof and protected against reverse polarity, helping prevent incorrect connections and accidental damage. The integrated digital battery voltmeter allows real-time voltage diagnostics, improving troubleshooting accuracy before you jump.
Spark-proof connections
Reverse polarity protection
Integrated digital battery voltmeter
Safe and mistake-free operation
Compact, Rugged & IP65-Rated Design
Despite its commercial power output, the GB250+ weighs just 14.7 lbs, making it one of the most compact and portable heavy-duty jump starters in its class. The enclosure is rated IP65 (with ports closed), protecting against dust and water intrusion in harsh environments.
IP65 rated (ports closed)
Operating temperature: -4°F to 122°F
Dimensions: 12-1/2" L x 14-3/4" W x 3-3/4" H
Weight: 14.7 lbs
24" heavy-duty battery clamp span
Multi-Function Power Bank & 600-Lumen LED Worklight
More than a jump starter, the GB250+ functions as a portable 242Wh lithium-ion power bank. Dual 5V USB ports (2.1A max each) allow charging of smartphones, tablets, GPS units, and other USB-powered devices. The integrated 600-lumen LED flashlight features seven light modes including emergency strobe and SOS for roadside or jobsite visibility.
Internal battery: 242 watt-hour lithium-ion
Dual USB output: 5V, 2.1A max each
600-lumen LED flashlight
Seven light modes including SOS & strobe
h2 Global Charging & Professional-Grade Kit
The included 56W XGC4 power adapter comes with interchangeable AC cords for North America (Type A), Europe (Type C), United Kingdom (Type G), and Australia (Type I), making it ready for international fleets and travel.
What’s Included in the Box
GB250+ 12V UltraSafe Lithium Jump Starter Pack
XGC4 56W Power Adapter with 60-inch (1.5m) cable
Interchangeable AC Cords: Type A (NA), Type C (EU), Type G (UK), Type I (AU)
Max Protection EVA Carrying Case
1-Year Limited Warranty
Shipping Notes
This item ships directly from the manufacturer. Please allow 5–7 business days for delivery.
VIDEO
WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov .
