3000A Starting Power
Delivers up to 3000A peak current for compatible petrol and diesel engines up to 32 litres.
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The NOCO Boost MAX GB251 is a professional 3000A portable lithium jump starter designed exclusively for compatible 24V lead-acid batteries. Rated for petrol and diesel engines up to 32 litres, it features UltraSafe 2.0 spark-proof protection, a 600-lumen LED light, integrated voltmeter, 137Wh power bank, dual USB charging and a 12V accessory output. Ideal for HGVs, buses, coaches, plant machinery and recovery vehicles.
Heavy-duty portable lithium starting power for compatible 24V lead-acid batteries and petrol or diesel engines up to 32 litres.
The NOCO Boost MAX GB251 is a professional-grade 3000A portable lithium jump starter designed exclusively for compatible 24V lead-acid battery systems.
It is rated for petrol and diesel engines up to 32 litres, making it suitable for demanding commercial, industrial, agricultural and recovery applications.
The GB251 also includes UltraSafe 2.0 connection protection, a 137Wh internal power bank, dual USB outputs, a 12V accessory output, an integrated battery voltmeter and a powerful 600-lumen LED work light.
Portable starting support for compatible 24V trucks, lorries and heavy goods vehicles.
Suitable for compatible 24V buses, coaches and large passenger vehicles.
Heavy-duty starting power for compatible construction, agricultural and industrial equipment.
Designed for professional recovery vehicles, fleet maintenance and commercial workshops.
Choose the GB251 when you need a dedicated professional jump starter for 24V lead-acid systems. If you need to support both 12V and 24V vehicles, consider the dual-voltage NOCO GB500 instead.
Delivers up to 3000A peak current for compatible petrol and diesel engines up to 32 litres.
Designed specifically for compatible 24V lead-acid batteries used in commercial vehicles and heavy equipment.
Spark-proof technology and reverse-polarity protection help reduce common connection errors during normal operation.
Dual USB charging ports and a 12V accessory output can power or recharge compatible devices and equipment.
Displays the connected battery voltage and also functions as the automatic 60-second jump-start countdown.
Seven light modes provide useful illumination for roadside, recovery, workshop and emergency situations.
Connect the clamps to the correct battery terminals or manufacturer-approved jump-starting points.
Switch on the GB251 and check that the indicators confirm a correct connection.
Attempt to start the vehicle within the active 60-second jump-start window.
Switch off the GB251, safely remove the clamps and recharge the unit where required.
Open the sections below for starting performance, safety, charging, battery compatibility and specifications.
The NOCO GB251 delivers up to 3000A peak starting current and is designed for compatible 24V lead-acid starting batteries.
It is rated for petrol and diesel engines up to 32 litres.
Actual performance depends on engine size, battery condition, temperature and the vehicle manufacturer’s approved jump-starting procedure.
The GB251 is designed exclusively for compatible 24V lead-acid starting batteries, including:
Do not use the GB251 to jump start 6V, 12V or lithium vehicle batteries. Never attempt to start a damaged, leaking or frozen battery.
Spark-proof protection helps prevent sparking during normal clamp connection when the GB251 is used according to its supplied instructions.
An error indicator warns the user if the positive and negative clamps are connected incorrectly.
Manual Override is available for deeply discharged batteries that are too low for the GB251 to detect automatically.
Important: Manual Override disables the normal spark-proof and reverse-polarity protection. Only use it after confirming the correct polarity and reading the supplied user guide.
The internal 137Wh battery provides portable power for jump-starting and operating compatible USB or 12V devices.
Two 5V, 2.1A USB outputs can recharge compatible smartphones, tablets, cameras, headphones and other USB-powered devices.
The 12V output can supply compatible accessories at up to 15A. Always check the voltage and current requirements of the connected device.
The GB251 can be recharged using the supplied 56W XGC power adapter or compatible 12V charging cable. A full recharge takes approximately 8.5 hours under suitable conditions.
The built-in voltmeter displays the voltage of the connected battery to assist with basic diagnostics. It also displays the 60-second jump-start countdown.
| Brand | NOCO |
|---|---|
| Model | GB251 |
| Product type | Professional lithium battery jump starter |
| Supported voltage | 24V only |
| Peak starting current | 3000A |
| Maximum petrol engine | Up to 32 litres |
| Maximum diesel engine | Up to 32 litres |
| Supported battery chemistry | 24V lead-acid |
| Internal battery | 137Wh lithium-ion |
| USB outputs | Dual 5V, 2.1A maximum |
| XGC input | 12V, 4A |
| 12V accessory output | 12V, 15A maximum |
| LED work light | 600 lumens with seven modes |
| Operating temperature | -20°C to +50°C |
| Charging temperature | 0°C to +40°C |
| Storage temperature | -20°C to +50°C |
| Protection rating | IP65 with the port covers closed |
| Dimensions | 315.7mm wide × 93.5mm deep × 218.9mm high |
| Weight | Approximately 6.67kg |
| Cooling | Natural convection |
| Warranty | 1-year limited warranty |
No. The GB251 is designed exclusively for compatible 24V lead-acid battery systems. It must not be used to jump start a 12V battery.
The GB251 is rated for compatible petrol and diesel engines up to 32 litres.
No. The GB251 provides temporary starting power but does not replace a battery charger or maintainer.
Yes. Its two 5V, 2.1A USB outputs can recharge compatible smartphones, tablets and other USB-powered devices.
The GB251 is IP65-rated when its port covers are securely closed. It can withstand suitable exposure to dust and water but must not be submerged.
Yes. It includes a 56W XGC mains power adapter, charging cable and protective carrying case.
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