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NOCO Boost MAX (Plus) GB250+ 24v 5250A Jump Starter

Sale price £1,199.95
Prices Inc. VAT. Free UK Standard Delivery.

The GB250+ is a portable lithium-ion 12v battery jump starter pack that delivers 5,250-amps for jump starting a dead battery in seconds. It features a patented safety technology that provides spark-proof connections and reverse polarity protection making safe and easy for anyone to use. Designed for large commercial vehicles with petrol or diesel engines up to 16 litres.

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About Us

McMartins: Powering Your Journey, Inside and Out

As a family-run business, we leverage a legacy of technical expertise that stretches back to 1972 to supply you with the best parts and accessories.

Our team have supplied garages and retailers across the UK - and now we’re bringing the same quality of products and expertise directly to motorists.

Family‑run, UK‑based specialists. Trusted by consumer and trade. Delivered to your door.

McMartins is a forward-thinking automotive parts and accessories retailer built on a foundation of technical expertise, quality products, and unwavering commitment to the customer. While our name is synonymous with battery excellence - the critical power source for every vehicle - we have grown to become a comprehensive partner for all your car care, maintenance, and enhancement needs.
We serve the everyday driver, the dedicated DIY mechanic, and professional repair shops alike, ensuring every vehicle gets the power and parts it needs to perform reliably.

 

Our Core Pillars: The McMartins Difference

Our business model is built on three essential pillars that guide every decision, from product selection to customer service:

1. Battery Mastery: The Heart of Our Business

  • Deep Expertise: Our initial focus and enduring strength is in power solutions. We stock a vast array of batteries for everything from standard combustion engines and high-demand modern vehicles to specialized batteries for motorcycles, boats, and electric vehicle (EV) auxiliary systems.

  • The Right Fit Guarantee: We utilize advanced fitment technology to ensure every customer is matched with the exact CCA, Group Size, and technology (Lead-Acid, AGM, EFB, Lithium) required by their specific vehicle.

  • Sustainability Focus: We are committed to responsible battery life cycle management, offering robust battery testing and free, ethical recycling services for old units.

 

2. Curated Quality Parts: Reliability First

  • Essential Maintenance: We supply the parts you need to keep your car safe and running smoothly, including:

    • Batteries: Traditional Led-Acid, Lithium and more.

    • Battery Chargers

    • Jump Starters

  • Vetted Suppliers: Unlike general retailers, we partner only with trusted, industry-certified manufacturers to guarantee the quality and durability of every component we sell.

 

3. Smart Accessories & Tools: Empowering the Driver

  • Modern Automotive Life: We stock a range of accessories that enhance both the driving experience and the garage workflow.

  • Product Categories Include: Battery chargers and jump starters, portable power packs, high-performance lighting, and premium diagnostic tools for the DIY market.

 

Our Customer Commitment: Service, Simplified

At McMartins, we understand that car maintenance can be confusing and intimidating. We strive to make the process as straightforward and stress-free as possible.

Commitment What It Means for You
Expert Advice Our staff is trained not just in sales, but in automotive diagnostics. We provide personalized, non-jargon advice to solve your problem quickly and correctly the first time.
Effortless Fitment Our systems confirm part compatibility before you buy, eliminating guesswork and costly returns.
True Value Pricing We offer competitive pricing on premium brands, ensuring you get the best combination of quality and affordability.

 


Looking Ahead: The Future of McMartins

The automotive landscape is constantly evolving, with new technologies like hybrid and electric vehicles becoming mainstream. McMartins is committed to staying ahead of this curve:

  • EV Ready: We are continually expanding our offerings to include auxiliary batteries for electric and hybrid vehicles, alongside advanced charging and monitoring accessories.

  • Digital Integration: We are investing in our online platform to provide hyper-accurate digital fitment tools, detailed instructional content, and seamless service.

  • Community Focus: We aim to be a resource for local mechanics and enthusiasts through workshops, trade programs, and local sponsorship.

 

McMartins is more than just a parts store - we are your partners in vehicle reliability and performance.

DELIVERY

Delivery Times

Monday-Friday: Next day delivery (same day dispatch) available on orders before 3:00pm. Automatically applies to most standard orders. Pallets (heavy weight and multiple or bulk quantities), Bank holidays, seasonal holidays, and other exclusions apply. UK Mainland only.

  • Standard delivery: Usually 2–5 working days.
  • Pallet delivery: Usually 5-7 working days.

We’ll email you tracking details as soon as your order is on its way.

Delivery Costs
Free delivery on all standard orders. Pallet delivery calculated on checkout.

Missed Deliveries
If you miss your delivery, our courier will leave instructions for re-delivery or collection. Tracking information will also include details for re-scheduling or options for delivery.

Damaged in Transit
If your parcel arrives damaged, please contact us within 48 hours of receipt with photos so we can put it right quickly.

Click here to view our Delivery (Shipping) Policy

RETURNS

You have 15 days from receiving your order to let us know you’d like to return it.
Once you’ve let us know that you’d like to return your order (within the 15-day cancellation period), you’ll have another 15 days to send it back to us.

Refunds

Refunds are made to your original payment method - usually within 5–10 working days.

Click here to view our Returns, Refunds & Warranty Policy
SKU: 4204021 Barcode:
Brand: NOCO

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    Description
    Voltage: 12v | Capacity: 5250Ah

    UltraSafe Jump Starter 5250A 12v Boost MAX

    Introducing our most powerful lithium jump starters yet. Designed for the largest, most challenging engine starts ever. With over 5250-amps of starting power, it can jump start gasoline and diesel engines up to 16-litres. 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.

    START VEHICLE WITHIN 60 SECONDS. AUTO POWER CONSERVATION.

    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. The yellow power LED indicates the 60-second sequence is over and can be reset if another jump start sequence is needed.

    REVERSE POLARITY PROTECTION. SPARK-PROOF.

    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.

    CHARGE DEVICES. USB CHARGE & RECHARGE.

    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.

    CHARGE UP TO 4X FASTER. RAPID 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 242 watt-hours lithium-ion battery in 8.5 hours.

    INTEGRATED VOLTMETER.
    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 GB250+ after 60 seconds to help preserve internal battery charge.

    ULTRA-BRIGHT. HIGH-LUMEN FLASHLIGHT.
    More than a jump starter, Boost MAX is a useful tool for daily use and emergency situations alike. The GB250+ 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.

    COMPACT & LIGHTWEIGHT. UNRIVALED PORTABILITY.
    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.


    What's In The Box

    • GB250+ Lithium Battery Jump Starter
    • 56-Watt XGC Power Adapter
    • 12-Volt 2-Foot XGC Cable
    • Protective Carrying Case
    • User Guide & Warranty Information
    Technical Information
    • Starting Current: 5250 Amps (Peak)
    • Voltage: 12 Volt
    • Battery Types: 12 Volt Lead-Acid Battery Systems
    • Internal Battery: 242 Watt-Hour Lithium-Ion
    • Operating Temperature: -4F to 122F (-20C to +50C)
    • Charging Temperature: 32F to 104F (0C to +40C)
    • Storage Temperature: -4 to 122 F (-20C to +50C)
    • Cooling: Natural Convection
    • USB Output: Dual 5 Volts, 2.1 Amps Max
    • XGC Input: 12 Volts, 4 Amp
    • XGC Output:12 Volts, 15 Amp
    • Petrol Engine Rating: Up to 16 Litres
    • Diesel Engine Rating: Up to 16 Litres
    • LED Flashlight: 600 Lumens
    • Product Size - Height: 8.62in (218.9mm)
    • Product Size - Width: 12.43in (315.7mm)
    • Product Size - Depth: 3.68in (93.5mm)
    • Weight: 14.7lbs (6.67kg)
    • IP Rating: IP65 (w/ Ports Closed)
    • Warranty: 1 Year Hassle-Free Warranty
    Manuals, Datasheets & Other Downloads

    About NOCO

    Why choose NOCO?

    Innovating Since 1914

    Established in 1914, NOCO designs and creates premium consumer battery chargers, jump starters, air inflators, and batteries, as well as a wide range of accessories. Through these world-class offerings, NOCO has effectively set the new standard in design, performance, and safety and has introduced an entirely new generation of products.

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