Estimated Arrival: Between May 23 and May 25. *ETA to the USA Only
Shipping & Returns: Free Shipping. All The Time.
3000 Amp UltraSafe Lithium-Ion Jump Starter
Start the vehicle within 60 seconds after pressing the power button on Boost. After the 60-second timeout is complete, the unit must be powered off, then back on, to initiate a new jump-start sequence.
We took our UltraSafe technology and made it better— UltraSafe 2.0. 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.
With two built-in 2.1A USB ports, you can power multiple devices at the same time, such as smartphones, tablets, action cameras, wireless headphones, wearables and more. With over 137 watt-hours of lithium power, the GB251+ can provide endless hours of operation and recharge your devices multiple times before needing a recharge.
From 0-100% 4X Faster. Charge directly from the vehicle's 12-volt auxiliary port or the XGC4 4-Amp Power Adapter to recharge it’s 137 watt-hours lithium-ion battery in 8.5 hours.
More than a jump starter, Boost MAX is a useful tool for daily use and emergency situations alike. The GB251+ is equipped with a 600-Lumen LED flashlight with various brightness modes, SOS, and emergency strobe— handy to have as a roadside or road trip tool.
Integrated Voltmeter / 60 Second Countdown Timer. The Boost MAX GB250+ is equipped with an integrated voltmeter to help pinpoint battery issues. The voltmeter doubles as a 60-second countdown timer, which shuts off GB251+ after 60 seconds to help preserve internal battery charge.
What’s in The Box
- GB251+ Lithium Battery Jump Starter
- 56-Watt XGC Power Adapter
- 12-Volt 2-Foot XGC Cable
- Protective Carrying Case
- User Guide & Warranty Information
3000 Amps (Peak)
12V Lead-Acid Battery Systems
137 Watt-Hour Lithium-Ion
-4°F to 122°F (-20°C to +50°C)
32°F to 104°F (0°C to +40°C)
Dual 5V, 2.1 Amps
12.4 x 6.1 x 3.7 in
12V XGC (Input)
12V @ 4 Amp
12V XGC (Output)
12V @ 15 Amp
Gas Engine Rating
Up to 32.0 L, Safe On All Engine Sizes
Diesel Engine Rating
Up to 32.0 L, Safe On All Engine Sizes
- The Boost Max Series - Introducing our most powerful lithium jump starters yet. Designed for the largest, most challenging engine starts ever. With over 3000-amps of starting power, it can jump start gasoline and diesel engines up to 32-liters.
- UltraSafe - Safe and easy to use battery jump starter pack without the worry of incorrect connections or sparks. Safely connect to any 24-volt battery with our mistake-proof design featuring spark-proof technology and reverse polarity protection.
- Commercial Grade - It's commercial in every way. It jump starts almost every type of vehicle and equipment, including semi-trucks (up to class 8), motorhomes, coaches, buses, mining, agricultural, construction, and vocational equipment - 6, 8, 12, and 16 cylinder - and more. Plus, an integrated digital battery voltmeter for enhanced diagnostics.
- Beyond Portable - Jump starters this powerful typically are enormous and weigh hundreds of pounds, but our high discharge lithium technology makes it the most compact and lightweight design in the world - weighing a mere 14-pounds. And its portable carrying case makes jump starting more convenient than ever.
- Multi-Functional - It's not just a lithium jump starter but also a portable power bank for recharging smartphones, tablets, and other USB devices, with an ultra-bright 600-lumen LED flashlight with seven light modes, including emergency strobe and SOS.
- What You Get - GB251 24V UltraSafe Lithium Jump Starter Pack and Power Bank, XGC4 56W Power Adapter with Interchangeable 60-inch (1.5m) AC Cords - Australia (Type I), Europe (Type C), North America (Type A), United Kingdom (Type G) - XGC Kit, Max Protection EVA Case, and 1-Year Limited Warranty.