The NOCO Boost Max GB250+ is a compact and portable 12V lithium jump starter delivering 5250A of peak starting power to safely jump start dead vehicle batteries in seconds. Designed for heavy-duty applications, it’s ideal for light trucks (Class 1, Class 2, Class 3), medium-duty vehicles (Class 4, Class 5, Class 6), and heavy-duty rigs (Class 7 and Class 8)—including semi-trucks, buses, RVs, motorhomes, agricultural equipment, construction machinery, and more. It supports gas and diesel engines up to 16 liters across 6, 8, 12, and 16 cylinders. Engineered with NOCO’s UltraSafe 2.0 Technology, the GB250+ features spark-proof connections, reverse polarity protection, and enhanced thermal efficiency for safe, mistake-free operation on any 12-volt battery. Weighing just 15 pounds, it delivers unmatched starting power in a compact design—replacing oversized jump starters and engineered to start the largest and most demanding engines. It also functions as a portable USB power bank for charging smartphones, tablets, and other devices, and recharges in just 4 hours using the included 56W power adapter. A built-in 600-lumen LED flashlight provides seven light modes—including SOS and emergency strobe—for improved visibility in roadside, emergency, or low-light work conditions. Rated IP65, the GB250+ is sealed against water, dust, and impact, delivering rugged durability wherever the job takes you.