NOCO Boost X GBX45 1250A UltraSafe Jump Starter Power Pack 12V Battery Booster
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The NOCO Boost X GBX45 is a 1250A UltraSafe lithium jump starter for 12V lead-acid batteries, rated for petrol engines up to 6.5 litres and diesel engines up to 4.0 litres. It is part of the NOCO Boost X range and also functions as a 60W USB-C power bank and 100-lumen LED torch.
This listing is the GBX45 1250A. The Boost X range is also available as the GBX75 2500A.
Key specifications
- Starting current: 1250A (peak)
- Engine rating: petrol up to 6.5L, diesel up to 4.0L
- Battery types: 12V lead-acid
- Internal battery: 31Wh lithium-ion
- USB-C Power Delivery: up to 60W in and out
- USB-A output: 5V 2.1A (10W max)
- LED torch: 100 lumens with SOS and strobe modes
- Water resistance: IP65 (with ports closed)
- Size and weight: 173.4 x 83.2 x 52.9 mm, 0.98kg
GBX45 Boost X: extreme power for the most difficult jump starts
- Rated at 1250A
- Up to 6.5L petrol engines
- Up to 4.0L diesel engines
- Jump starts 12V batteries
The Boost X uses NOCO's PX Lithium Technology for powerful starting, ultra-fast charging and greater versatility. It is a new series rather than a refresh, offering more starting power and USB-C Power Delivery for rapid recharging. If you need a step down in power, the NOCO Boost GB40 1000A is worth considering.
Spark-proof. Reverse polarity protection.
The GBX45 features UltraSafe 2.0 — a spark-proof, mistake-free design with reverse polarity protection, enhanced thermal efficiency and improved power management for better performance and longer battery life.
Start vehicle within 60 seconds. Auto power conservation.
Press the power button and start the vehicle within 60 seconds. Once the timeout elapses, the unit must be switched off and back on to begin a new jump-start sequence. The yellow power LED signals when the 60-second window has ended and a reset is needed.
Up to 60W fast charging. Charge devices.
The built-in power bank delivers 60W both in and out via USB-C Power Delivery, suitable for phones, tablets, laptops, wearables and other USB-C devices.
Ultra-bright. 100 lumens.
The integrated LED torch outputs 100 lumens with multiple brightness modes, plus SOS and emergency strobe — practical for roadside use and everyday situations alike.
Explore the full range in NOCO Jump Starters.
Specification
| Battery | Types 12 Volt Lead-Acid Batteries |
|---|---|
| USB Input USB-C | 5 Volts 1.5 Amps / 9 Volts 3 Amps / 12 Volts 3 Amps / 15 Volts |
| USB Output USB-A | 5 Volts 2.1 Amps Max / 10 Watts Max USB-C: 5 Volts 3 |
| Product Size Height | 3.28in (83.2mm) Width: 6.83in (173.4mm) Depth: 2.08in (52.9mm) Weight: 2.16lbs (0.98kg) |
| IP Rating IP Rating | IP65 (w/ Ports Closed) |
More specs
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What's Included
- GBX45 Lithium Jump Starter
- HD Precision Battery Clamps
- USB-C to USB-C Cable
- Microfiber Storage Bag
- Safety & Warranty Information
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About the NOCO GBX45
From our tech experts at CEN
A lithium jump starter, rated at 1250A, small enough to live in the boot and start a car without another vehicle or a set of leads.
Who it suits
Anyone who has been stranded by a flat battery, and drivers of cars that sit for long periods — classics, second vehicles, campers and anything seasonal.
Our tech experts advise
Keep it charged: a jump starter that has sat in a cold boot for a year is no use when you need it. Check the rating suits your engine size, particularly for diesels, which need considerably more current than petrol engines of the same capacity. get in touch if you are unsure which model fits your vehicle.
Explore the full NOCO range at CEN, with fast UK dispatch and expert advice from our Nottingham team. Shop all NOCO
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Frequently Asked Questions
Q: Will this jump starter work on my vehicle?
A: Jump starters are rated by engine size and fuel type. The maximum petrol and diesel engine capacities are listed in the Specification tab. Choose a unit rated at or above your engine size.
Q: Is a lithium jump starter safe to use?
A: Yes. Modern lithium jump starters include spark-proof connections and reverse polarity protection, making them safer and far more portable than traditional boosters.
Q: How long does the jump starter hold its charge?
A: Quality lithium jump starters hold a usable charge for months in the glovebox or boot. Topping up every few months keeps it ready, and charge time from flat is listed in the Specification tab.
Q: What size engine can the NOCO GBX45 jump start?
A: The GBX45 is rated at 1250A and can jump start 12V lead-acid batteries on petrol engines up to 6.5 litres and diesel engines up to 4.0 litres.
Q: Can the NOCO GBX45 charge my phone or laptop?
A: Yes. Its USB-C Power Delivery port provides up to 60W both in and out, suitable for phones, tablets, laptops and wearables, and there is also a USB-A output of up to 10W.
Q: Is the NOCO GBX45 waterproof?
A: It is rated IP65 with the ports closed.
Q: What is in the box with the NOCO GBX45?
A: The GBX45 lithium jump starter, HD precision battery clamps, a USB-C to USB-C cable, a microfibre storage bag and safety and warranty information.
