NOCO Boost X GBX75 review
NOCO Boost X GBX75: 2500A UltraSafe Jump Starter Power Pack – For 8.5L Petrol and 6.5L Diesel Engines
By Tom Calder
NOCO states honest engine-size coverage (8.5L petrol / 6.5L diesel) rather than just a peak-amp headline, and it backs that up with reverse-polarity protection and spark-proof clamps that make it hard to use unsafely. It's a premium price, but the extra size and 60W USB-C charging justify it for larger vehicles. Like all lithium packs, keep it indoors rather than in a hot car boot over summer — heat shortens the cell's life.
- Best for
- Households with a bigger petrol car, 4x4, van or light diesel, who want one unit that both starts the car and doubles as a genuinely useful USB-C power bank.
- Skip it if
- You only ever drive a small petrol hatchback or supermini
as of 4 Nov 2026, 19:07 GMT · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.We earn a commission if you buy through the retailer links on this page. It doesn't change our verdict. How we make money →
Researched, not used. We haven't used this product. This review is built from the maker's specifications, owner reports and our own sizing.
What we like
- Stated engine coverage (8.5L petrol/6.5L diesel), not just an inflated amp number
- 60W USB-C Power Delivery doubles as a genuine phone/laptop charger
- Reverse-polarity protection and spark-proof clamps reduce the risk of user error
Worth knowing
- Expensive next to smaller jump starters covering typical hatchbacks
- IP65 only applies with the ports closed — it isn't fully waterproof
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Our review
NOCO's mid-large Boost X: a 74Wh lithium pack rated at 2,500A peak for petrol engines to 8.5L and diesels to 6.5L, with 60W USB-C in both directions that refills it in 1.7 hours. The figure that matters is that charging speed, which makes it a jump pack that is also a proper laptop power bank. It suits a household with a big petrol car, a 4x4, a van or a light diesel.
What the numbers mean
NOCO rates the GBX75 at 2,500A peak and, more honestly, for petrol engines up to 8.5L and diesels up to 6.5L; NOCO publishes no sustained cranking current, so the litre ratings are the guide. The 74Wh battery is roughly three times the GB40's 24Wh and sits under the 100Wh limit the CAA applies to power banks in hand luggage. NOCO's UltraSafe 2.0 design keeps the spark-proof clamps and reverse-polarity protection of the older Boost range and adds better thermal and power management, by NOCO's description. Once powered on, the pack gives you 60 seconds to start the vehicle before it must be switched off and on again, which stops it sitting live on a battery.
On the road, in a British winter
At 1.71kg and 213.4 by 137 by 64.1mm it fits a door pocket or under a seat. NOCO rates operation and storage from -20°C to +50°C, with charging limited to 0°C to +40°C; a hot LED and a cold LED on the panel show when it has drifted outside the window, and the torch still works when the boost will not. Five minutes on a 60W charger takes it from empty to one jump start by NOCO's figure, which is the answer to a pack found flat on a frosty morning. The 400-lumen torch has brightness modes, SOS and strobe. The connection order, and when not to attempt a start, are in how to jump start a car.
How it compares
The NOCO Boost GB70 is the older equivalent: 2,000A peak, 8.0L petrol and 6.0L diesel, 56Wh, 1.9kg, with a 400-lumen torch but no fast charging. The CTEK RB 3000 is lighter at 1.028kg, publishes a 1,980A cranking figure and charges at 30W in 2.5 hours and carries a two-year warranty, but states no diesel rating. For a diesel above 6.5L the NOCO Boost GB150 steps up to 7.0L and 88Wh at 2.9kg. More on our jump starter comparison.
Living with it
The USB-C port takes and gives up to 60W (20V at 3A), so the charger that fills a laptop fills this in 1.7 hours by NOCO's figure, and the pack will run a laptop back; a USB-A port adds 10W for a phone. NOCO's box holds the pack with its integrated clamps, a USB-C to USB-C cable, a 24-inch 12V-to-USB-C cable for a car socket and a storage bag; there is no mains charger. The shell is IP65 with the ports closed. NOCO's spec page lists a one-year warranty, and its warranty terms say UK buyers may get a minimum of two years.
Safety and storage
Reverse polarity shows a solid red light rather than a spark; a short at the clamps, a 24V system or a bad cell each flash a code, and NOCO's guide lists them. NOCO says never to jump a damaged or frozen battery and to work in a ventilated space. Store it charged, somewhere inside NOCO's storage range of -20°C to +50°C with a daily average of 0°C to +25°C, charge it only between 0°C and +40°C, and recharge it after each use and every few months; our lithium battery fire safety guide covers the rest. A battery that keeps going flat wants a garage or a maintenance charger, not a bigger pack.
Our verdict
Buy the GBX75 if you drive a large petrol, a 4x4, a van or a diesel up to 6.5L and would value a pack that doubles as a 60W laptop power bank and refills in under two hours. Skip it for a small petrol hatchback, where a GB40 or GBX55 on our comparison page does the job, and skip it for a diesel over 6.5L, which is GB150 territory.
A researched review, built from the maker's specs, manual and UK listings; facts checked 21 Oct 2026. Sources: NOCO — Boost X GBX75 product page (engine ratings, 1.7-hour recharge, 60W USB-C, 400 lumens); NOCO — GBX75 tech specs (battery, ports, size, weight, IP rating, warranty); NOCO — GBX75 user guide (temperatures, recharge times, LED codes, UK warranty terms); NOCO — GBX75 data sheet.
Who shouldn't buy this
You only ever drive a small petrol hatchback or supermini — a smaller, cheaper NOCO Boost model (e.g. GBX55) will jump it fine without paying for capacity you won't use.
Key specs
| Peak current | 2500A peak (marketing figure) |
| Engine coverage | Up to 8.5L petrol / 6.5L diesel engines |
| Capacity | 74Wh lithium-ion internal battery |
| Extras | 60W USB-C PD in/out |
This is a Researched review: we haven't used this product. We check every specification against at least two independent sources, re-check the UK price on a schedule where we can track it automatically, and say plainly who it isn't for. Commissions never change a rating.
If this isn’t the one
Best for A compact glovebox backup that gets a flat petrol car or small diesel going without waiting for a breakdown van.
as of 4 Nov 2026, 19:07 GMT · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.
Best for Drivers who need to cover a bigger diesel - a van, 4x4 or larger family car - as well as ordinary petrol cars, in a pack that still fits in a glovebox.
as of 4 Nov 2026, 19:07 GMT · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.
Best for Drivers who want one mid-size jump starter that covers most family cars and small diesels, rather than buying NOCO's biggest (and priciest) unit just in case.
as of 4 Nov 2026, 19:07 GMT · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.Questions
How long does the NOCO GBX75 take to charge?
NOCO quotes 1.7 hours to full from a 60W USB-C Power Delivery charger, and five minutes of charge for one jump start. Its user guide gives 20 hours from a 5W phone charger.
Can the NOCO GBX75 start a diesel?
NOCO rates it for diesel engines up to 6.5L and petrol engines up to 8.5L, on 12V lead-acid batteries only.
Can I take the GBX75 on a plane?
Its 74Wh battery is under the 100Wh ceiling the CAA sets for power banks in hand luggage, so normally yes, in the cabin only and never in the hold. Check your airline's rules before you fly.
Is the NOCO GBX75 waterproof?
NOCO rates it IP65 with the ports closed: dust-tight and resistant to water jets. Rain at the roadside is fine; submersion is not.
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