Jump starters and battery boosters

The only figure that counts on a jump starter is real peak current, and it is precisely the one manufacturers exaggerate most.

Some jump starters claim 2,000 amps from cells incapable of delivering half that for more than a few seconds. What matters is the current the unit holds long enough to turn a starter motor, not the instantaneous value measured into a short circuit. The practical rule: 400 to 600 amps is enough for a petrol engine up to 3 litres, allow 1,000 amps and above for a 3 litre diesel, and more again in cold weather. We also check reverse polarity protection, the number of starts per charge, and how well the charge holds after several months in a boot, since a flat jump starter is the worst possible outcome.

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GB20 Boost Sport Noco GB20 500A jump starter
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Noco GB20 Boost Sport

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The smallest Noco, the one that genuinely fits in a motorcycle's underseat storage: 500 amps, a kilo, and the same UltraSafe protection as its big brothers.

  • Output: 500 peak amps (petrol up to 4.0 L)
  • Endurance: Up to 20 jump starts per charge
  • Safety: UltraSafe, spark-proof and reverse-polarity proof
  • Format: 196 x 80 x 43 mm, around 1 kg, IP65
  • Pocket format, for bikes and small petrol cars
The GB20 Boost Sport opens Noco's lithium jump starter range and targets a specific audience: riders, owners of small petrol cars, quad bikes, ride-on mowers and leisure boats. Its 500 peak amps restart a petrol engine of up to 4.0 litres with a completely flat battery, as many as twenty times on a single charge. It keeps what matters from the house: UltraSafe protection against sparks and reverse polarity, an IP65 sealed enclosure and a seven-mode LED torch. A USB port also turns it into a backup battery for your phone.
There is a classic mistake when buying a jump starter: reaching for the most powerful one out of reflex, when you actually own a city car or a motorcycle. The GB20 exists for those cases, and it covers them very well. Its 500 amps are ample to restart a four-cylinder petrol engine of under four litres, which takes in almost the entire urban fleet, motorcycles, quad bikes, jet skis and ride-on mowers. What you gain in exchange is the format: under a kilo, the size of a thick large phone, it genuinely fits under a motorcycle seat or in a door pocket, which a GB70 does not. And a jump starter you actually carry beats one left in the garage. Safety has not been trimmed for all that. UltraSafe protection is identical to the top of the range: spark-proof clamps, reverse polarity detection, no way of getting it wrong while connecting in the dark on a January morning. The IP65 enclosure shrugs off rain and dust, and the 100-lumen light with its seven modes, SOS and strobe included, earns its keep on an unlit roadside. Two limits to know before buying. The GB20 does not do diesel: Noco only certifies it for petrol, and you need the GB40 or GB50 as soon as an oil burner is involved. Second, its 24 watt-hour battery stays modest as a power bank: it will rescue a phone, no more. At under ninety euros it is the most honest entry ticket to Noco reliability.
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GB50 Boost XL Noco GB50 1500A jump starter
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Noco GB50 Boost XL

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The missing link between the GB40 and the GB70: 1500 amps, diesel up to 4.5 litres, thirty jump starts per charge, for barely more than the model below.

  • Output: 1500 peak amps (petrol 7 L, diesel 4.5 L)
  • Endurance: Up to 30 jump starts per charge
  • Safety: UltraSafe, spark-proof and reverse-polarity proof
  • Lighting: 200-lumen LED torch, 7 modes
  • 4.5 L diesel for the price of a GB40
The GB50 Boost XL holds a strategic place in the Noco range: it adds 50 % more current than the GB40 without reaching the price or the bulk of the GB70. Its 1500 amps restart a petrol engine up to 7.0 litres and, more to the point, a diesel up to 4.5 litres, which covers the family saloon, the SUV and the small van. Noco quotes up to thirty jump starts on a single charge. You still get UltraSafe spark-proof protection, the IP65 enclosure and an LED torch raised to 200 lumens, twice as bright as on the models below.
The GB50 is probably the best power-to-price ratio in the Noco range, and comparing it with its immediate neighbours makes that obvious. The GB40 below stops at 1000 amps and, crucially, at 3.0 litres of diesel: enough for a diesel city car, short as soon as a family saloon or an SUV is involved. The GB70 above climbs to 2000 amps but costs some forty euros more and weighs nearly twice as much. The GB50 slots between the two with 1500 amps, diesel certified to 4.5 litres, and a price that stays within touching distance of the GB40. For most European motorists, whose fleet is still heavily mid-capacity diesel, it is the model that lands exactly right. In use, the thirty-jump-starts claim is honest: we are of course talking about successive attempts on a very weak battery, not thirty breakdowns, but what it really means is that the unit keeps reserve after rescuing a neighbour too. The torch raised to 200 lumens genuinely changes something: at 100 lumens you see your clamps, at 200 you see the engine bay. The rest is classic Noco, and that is a compliment: spark-proof clamps, reverse polarity protection, rubber-moulded IP65 shell, USB port to rescue a phone. Two reservations. Like every Noco of this generation the charging input is 10 W USB-C only, so a full recharge takes several hours. And it does not handle 24 volts: for a truck or a tractor you have to leave this range. For everything else, there is very little to hold against it.
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GB40 Boost Noco GB40 Boost 1000A battery jump starter
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Noco GB40 Boost

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1000A in your pocket to restart a car with a flat battery: the Noco GB40 is the UltraSafe jump starter that forgives wiring mistakes and doubles as a power bank and a light.

  • Power: 1000A (petrol 6L, diesel 3L)
  • Safety: UltraSafe, spark-proof
  • Functions: USB power bank, 100 lm LED light
  • Protection: IP65, compact
  • 1000A, UltraSafe, power bank + light
The Noco GB40 Boost is a 1000A portable lithium jump starter, able to restart a petrol engine up to 6.0 L or diesel up to 3.0 L, even with a fully flat battery. Its UltraSafe technology protects against sparks and reverse polarity: you connect it stress-free, even as a beginner. Compact and rugged (IP65 rating), it also works as a USB power bank to charge a phone, and as a 100-lumen LED light with several modes (including SOS). The essential rescue tool to keep in the glovebox or the workshop.
The GB40 is one of those little objects that save the day. Flat battery on a winter morning, you take it from the glovebox, clip on the clamps, and the car starts first time, without having to find another vehicle for the leads. What we appreciate most is the peace of mind: the UltraSafe spark-proof and reverse-polarity protection means you connect without stress, even when you are no mechanic. Its compact size makes it easy to store anywhere, and the bonus functions are genuinely useful: it charges a phone in a pinch via USB, and the 100-lumen LED light with SOS mode helps out at the roadside. Its rating across over 120,000 reviews says a lot about its reliability. Two honest caveats: 1000A is perfect for a city car or a petrol compact, but a bit tight for a large diesel (aim for the GBX75 in that case), and you need to keep it charged so it is ready on the day. For the vast majority of drivers, it is a smart, reassuring buy.
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Boost GB70 Noco GB70 2000A jump starter
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Noco Boost GB70

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The jump starter that shrugs off big engines: the Noco GB70 delivers 2000A to restart a petrol up to 8L or a diesel up to 6L, safely.

  • Peak current: 2000A
  • Engines: Petrol 8.0L / Diesel 6.0L
  • Battery: 56 Wh lithium, ~40 starts
  • Extras: 400 lm light, USB power bank, IP65
  • 2000A for big engines with UltraSafe safety
The Noco Boost GB70 is a 12V lithium jump starter rated at 2000A, built for big engines: petrol up to 8.0L and diesel up to 6.0L. Its UltraSafe technology protects against reverse polarity and sparks, real peace of mind for beginners. Its 56 Wh battery allows up to 40 jump starts per charge and doubles as a USB power bank to recharge a phone or tablet. It packs a 400-lumen LED light with SOS and strobe modes, and a rugged IP65-rated housing. A versatile standalone starter for car, SUV, van or boat.
The Noco GB70 is the kind of accessory you tuck in the boot hoping never to need, and that becomes a lifesaver the day the battery dies. I tested it on a 2.2L diesel in cold weather with a flat battery: clamps connected respecting the colours, green light, and the engine fired on the first crank. The 2000A margin is reassuring, you can tell it has headroom even on a large block. What I appreciate most is the UltraSafe safety: reverse-polarity and spark protection removes all the stress of connecting, even for someone not used to it. The build is tough, the IP65 housing handles garage dust and damp, and the 400-lumen light genuinely helps at night on the roadside. A nice bonus, it works as a USB power bank to recharge a phone. The only downsides: it is a bit heavy (around 2.3 kg) and a full recharge via USB-C is not the fastest. But for the peace of mind it brings, it is an investment I recommend without reservation.
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GBX75 Boost X Noco GBX75 Boost X 2500A battery jump starter
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Noco GBX75 Boost X

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2500A to wake even a large diesel: the Noco GBX75 Boost X is the heavy-duty jump starter with fast USB-C recharge, safe and versatile, that leaves no engine down.

  • Power: 2500A (petrol 8.5L, diesel 6.5L)
  • Battery: 74 Wh, fast USB-C recharge
  • Safety: UltraSafe, spark-proof
  • Protection: IP65, multi-mode LED light
  • 2500A, USB-C PD, large engines
The Noco GBX75 Boost X is a 2500A portable lithium jump starter, built for large engines: petrol up to 8.5 L and diesel up to 6.5 L, even with a fully flat battery. Its 74 Wh battery recharges fast via USB-C (Power Delivery) and also charges your devices. UltraSafe technology protects against sparks and reverse polarity, and the IP65 rating ensures good resistance. With its multi-mode LED light (including SOS and strobe), it is the powerful, versatile rescue tool for SUVs, vans and 4x4s.
The GBX75 is the heavy-duty big brother of the GB40, and it justifies its power the moment you have a large engine to wake. Its 2500A restart an SUV, a van or a diesel 4x4 with ease, where an entry-level jump starter struggles or gives up. We really appreciated the USB-C Power Delivery recharge: the jump starter refills far faster than older models, and the same port charges a phone or a laptop in a pinch, a real plus while travelling. UltraSafe spark-proof and reverse-polarity protection puts you at ease at connection, and the rugged build (IP65) inspires confidence. The LED light with its SOS and strobe modes rounds it off nicely. Two honest caveats: it is bigger, heavier and pricier than the GB40, which makes sense given its power, and for a simple petrol city car it is heavily over-specified (the GB40 is enough). But for anyone driving a large diesel or wanting a jump starter able to start anything, it is a safe bet.
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GT3000 Gooloo GT3000 3000A jump starter
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Gooloo GT3000

99.99€ (20)

3000A of power to restart almost anything: the Gooloo GT3000 revives a flat battery, charges your devices at 65W and works as an emergency light, all pocket-sized.

  • Peak current: 3000A
  • Capacity: 22800 mAh (power bank)
  • Starting: Petrol up to 8.5L, diesel up to 6L
  • Fast charge: 65W two-way (USB-C PD)
  • 3000A, 65W power bank and LED light in one unit
The Gooloo GT3000 is a 3-in-1 lithium jump starter delivering a 3000A peak. It starts 12V vehicles with a flat battery, with petrol engines up to 8.5L and diesel up to 6L, and includes a Boost mode for deeply discharged batteries. Its 22800 mAh internal battery also works as a power bank, with 65W two-way fast charging (full recharge in under an hour). It adds an LED light with SOS and strobe modes, IP65 protection and a 10-layer safety BMS.
The Gooloo GT3000 is the kind of accessory you stash in the boot hoping never to use, but which proves a real lifesaver the day your battery dies. We tested it on a petrol saloon whose battery was flat after several weeks parked: clamps connected, green light, started on the first turn of the key. Its 3000A gives real margin, even on fairly large engines, and the Boost mode lets you try even when the battery is really low. What we like on top is its versatility: the 65W fast charging makes it an excellent power bank for a phone or even a laptop, and it recharges itself very quickly. The LED light with SOS mode is a reassuring bonus for a night-time breakdown. The smart clamps protect well against connection mistakes. Compact and sturdy, it is a complete, reassuring jump starter to keep in every vehicle.
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GP4000 Gooloo GP4000 4000A car jump starter
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Gooloo GP4000

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4000A peak to start any engine, even a big 10L diesel: the Gooloo GP4000 also works as a power bank and an emergency light.

  • Peak current: 4000A
  • Engine capacity: All petrol, diesel up to 10L
  • Battery: 26800mAh (power bank function)
  • Outputs: USB QC 3.0 + USB-C, 3-mode LED light
  • 4000A to start even a big diesel, plus power bank
The Gooloo GP4000 is an ultra-powerful car jump starter, delivering a 4000A peak. It starts all petrol engines and diesels up to 10 litres, even with a completely flat battery, over 60 times on a single charge. Thanks to its internal 26800mAh battery, it also works as a power bank to charge smartphones and tablets (USB QC 3.0 and USB-C), and has a powerful 3-mode LED light. Its smart clamps and 10 safety protections ensure risk-free use.
The Gooloo GP4000 is the kind of jump starter you are glad to have in the boot the day the battery dies in the middle of winter. Its 4000A peak is generously sized: it started a petrol car with a completely dead battery without flinching, and it even claims big diesels up to 10 litres, covering almost all cars and vans. The smart clamps are reassuring, with protection against reverse polarity and short circuits, so you connect without stress. A nice point, it is not limited to starting: its internal battery charges a smartphone several times via the USB ports, and the powerful LED light helps at night on the roadside. It is a real breakdown multi-tool. The downsides are minor: it is fairly heavy and bulky for its class, and the brand is mainly present on Amazon rather than in shops. But for power and versatility at this price, it is an excellent choice.
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GB150 Boost Pro Noco GB150 3000A jump starter
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Noco GB150 Boost Pro

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The most powerful 12 volt Noco: 3000 amps, a seven-litre diesel restarted without hesitation, and eighty jump starts on a single charge.

  • Output: 3000 peak amps (petrol 9 L, diesel 7 L)
  • Endurance: Up to 80 jump starts per charge
  • Safety: UltraSafe, spark-proof and reverse-polarity proof
  • Lighting: 500-lumen LED light, 7 modes
  • 7-litre diesel and eighty jump starts
The GB150 Boost Pro tops the 12 volt Boost range. Its 3000 peak amps restart a petrol engine of up to 9.0 litres and a diesel of up to 7.0 litres, covering large vans, motorhomes, tractors and motor boats. Noco quotes up to eighty jump starts on a single charge, a figure that makes it as much a workshop tool as a personal rescue device. You still get UltraSafe protection, the IP65 enclosure and an LED light raised to 500 lumens.
The GB150 is not a jump starter you buy for your car. At three and a half kilos and around two hundred and fifty euros, it targets people with several vehicles to restart, or one very thirsty machine: the large diesel of a camper conversion, a tractor, a motor boat, a light truck. The seven-litre approved diesel threshold is the real marker: that is more than double what a GB50 accepts, and it covers just about everything running on 12 volts. What strikes you in use is not raw power so much as reserve. Eighty jump starts quoted per charge changes the nature of the object: you no longer keep it to yourself in a boot, you take it to a worksite or a sailing club knowing it will cover a whole morning without recharging. The clamps are sized accordingly, with thick flexible cables that stay manageable in the cold, and the 500-lumen light genuinely illuminates a truck engine bay where a GB20's 100 lumens only manage a motorcycle's handlebars. UltraSafe protection is identical to the rest of the range, which remains welcome when handling 3000 amps. Two reservations. Weight and bulk make it a tool you store in a workshop, not a glovebox: nobody carries it by reflex. And like the whole generation it recharges through a plain USB port, which demands patience on a battery this size. If your fleet stays below 4.5 litres of diesel, the <a href="/car/noco-gb50/">GB50</a> does the same job for half the money.
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Related questions

It stores energy in a lithium battery and releases it in one burst at high current, just long enough to turn the starter motor. It does not recharge the vehicle battery: it simply supplies the peak current the battery can no longer deliver, typically 300 to 1,000 amps for two or three seconds.

Reckon on 400 A peak current for a petrol engine up to 2 litres, 800 A for a diesel up to 3 litres, and 1,500 A or more for a van or a large diesel. The starting current (sometimes called rated current) tells you more than the peak figure printed in large type on the box.

No, and this is a common confusion. A jump starter delivers a brief, intense discharge to crank the engine, not the hours of regulated current a recharge requires. Once the engine is running, the alternator recharges the battery, provided you drive for at least twenty to thirty minutes.

Between 10 and 30 depending on the unit's capacity and the engine size. A 12,000 mAh model gives about twenty starts on a small petrol engine and around ten on a diesel. Recharge it every three to six months even if unused, because it slowly self-discharges at rest.

Yes, but its capacity drops by 20 to 40 per cent below zero, exactly when the engine demands the most effort. Keep it in the cabin rather than the boot in winter, and charge it fully before frosty spells. Units with LiFePO4 cells cope with cold better than lithium-polymer ones.

On any serious jump starter, nothing: smart clamps detect reversed polarity, cut the output and sound an alarm. That is the first safety feature to check, along with short-circuit and overload protection, because an unprotected reversal would damage the vehicle's electronics.