Product Specifications for NOCO GB251+ Boost Max 3000A 24V UltraSafe Lithium Jump Starter
| BM Part #: | GB251 |
|---|---|
| Voltage: | 24 Volt |
| Type: | Li-Ion |
| Length: | 12.43" |
| Width: | 6.09" |
| Height: | 3.69" |
| Shipping Weight: | 14.70Lbs |
| Warranty: | 1 Year |
| Product Manual: | Download |
| Datasheet: | Download |
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
- 3,000A Peak Starting Power for 24V Systems: Starts gas and diesel engines up to 32 liters on any 24-volt commercial vehicle system.
- UltraSafe 2.0 Technology: Spark-proof clamps and reverse polarity protection ensure safe connections every time, even for first-time users.
- Weighs Just 14.7 Lbs.: Delivers commercial-grade 24V jump-starting capability that fits in a carrying case, not a cart.
- Integrated Voltmeter and Auto-Shutoff Timer: Check battery health before you jump and automatically preserve unit charge after each 60-second sequence.
- IP65-Rated for Any Conditions: Sealed against dust and water, and operates reliably from -4°F to 122°F in any work environment.
- 600-Lumen LED Flashlight: Seven modes, including SOS and emergency strobe, for visibility and safety during roadside situations.
Product Description
There is a version of the dead-battery problem that is uniquely frustrating: you buy a powerful jump starter, get to the job, and find out it is built for 12V — and your truck runs 24V. The NOCO GB251+ was built specifically to solve that problem.
At 3,000 peak amps, the GB251+ is purpose-built for 24-volt battery systems found in commercial semi-trucks, European trucks, and heavy industrial equipment. If your rig runs on a true 24V electrical system, this is your unit.
What It Can Start
The GB251+ handles gasoline and diesel engines up to 32 liters across the full range of commercial and heavy-duty vehicles:
- Semi-trucks and tractor-trailers up to Class 8
- Buses, coaches, and motorhomes
- Agricultural and construction equipment
- Mining and vocational vehicles
- Gas and diesel engines with 6, 8, 12, or 16 cylinders
Not sure whether your vehicle uses a 12V or 24V system? Check the battery terminals or your owner's manual before ordering. If you need a 12V jump starter, the NOCO GB250+ is the right fit.
Safe Enough for Anyone on Any Crew
NOCO's UltraSafe 2.0 technology makes the jump process simple and mistake-proof. Spark-proof clamps and reverse polarity protection mean a wrong connection won't damage your vehicle or the unit. The built-in digital voltmeter shows you the battery's condition before you attempt a start, so there is no jumping blind.
A 60-second auto-shutoff timer activates when you press the power button. It keeps you focused during the jump sequence and helps preserve the unit's internal charge between uses.
Portable, Rugged, and Ready
Traditional 24V heavy-duty jump starters tend to be enormous. The GB251+ weighs just 14.7 lbs and fits neatly inside its included protective carrying case. Rated IP65, it is sealed against dust and water and operates in temperatures from -4°F to 122°F — from a cold January morning on the lot to a hot summer job site.
Two built-in USB ports let you charge phones, tablets, or radios while you work, drawing from the 137 Wh lithium-ion battery pack. The 600-lumen LED flashlight adds seven modes, including SOS and emergency strobe, for roadside visibility when you need it most. The included 56W power adapter recharges the unit fully in as little as 3 hours.
The GB251+ ships ready to work: jump starter, 56W XGC power adapter, four interchangeable AC cords (US, UK, EU, AU), 12V XGC cable, and a protective carrying case.
If your vehicle runs 24V and downtime is not an option, order the NOCO GB251+ today.
Frequently Asked Questions
How do I know if my vehicle needs a 12V or 24V jump starter?
A: The easiest way to check is to count the batteries or look at the system voltage label under the hood. Vehicles with two 12V batteries wired in series operate on a 24V system and are compatible with the GB251+. Most North American passenger vehicles, light trucks, and many domestic commercial vehicles run 12V. Many European semi-trucks, certain heavy construction and mining equipment, and some buses use 24V systems. If you are unsure, check your owner's manual or look at the battery compartment — a 24V setup typically has two 12V batteries connected positive to negative. If your vehicle runs 12V, the NOCO GB250+ is the right choice.
What is the difference between the GB251+ and the GB250+?
A: The key difference is voltage. The NOCO GB250+ is built for 12-volt battery systems and delivers 5,250 peak amps for engines up to 16 liters. The GB251+ is built for 24-volt systems, delivers 3,000 peak amps, and handles engines up to 32 liters. Both units share the same physical footprint, IP65 rating, UltraSafe 2.0 technology, and 14.7 lb weight. The choice between them comes down entirely to your vehicle's electrical system voltage, not the size or weight of the engine.
Is it safe to use if I connect the clamps in the wrong order?
A: Yes. NOCO's UltraSafe 2.0 technology includes reverse polarity protection that prevents the unit from delivering power if the clamps are connected incorrectly. The GB251+ will display an error indicator rather than allowing a dangerous connection. Spark-proof clamp technology also prevents accidental ignition during the connection process. This makes it safe to use even for people with no prior experience jump-starting a vehicle.
How do I recharge the GB251+, and how long does it take?
A: The GB251+ recharges using the included 56W XGC power adapter, which brings the unit from empty to full in as little as 3 hours when connected to a standard AC outlet. It can also recharge through a vehicle's 12-volt auxiliary port using the included XGC cable, though charge times will be longer via that method. The included power adapter comes with four interchangeable AC cords to support use in North America, the UK, Europe, and Australia.
Can the GB251+ handle cold weather jump starts?
A: Yes. The GB251+ is rated to operate in temperatures as low as -4°F, which covers most cold-weather conditions encountered in commercial and industrial use. It has been tested on large diesel engines in sub-freezing temperatures and performs reliably under those conditions. Keep in mind that charging should only take place between 32°F and 104°F — the unit can operate in the cold, but should be brought to a warmer environment if it needs to be recharged.
