A dead battery always picks the worst moment — a cold morning before work, a dark parking lot, or a highway rest stop miles from help. The GOOLOO GP4000 is built for exactly that moment: a 4000A car jump starters portable pack that promises to start all gasoline engines and diesels up to 10.0L, with no second vehicle and no roadside wait. It is also a power bank and an LED work light in the same orange box.
In this review we cover what its 4000A rating means, how to use it safely, what its SuperSafe protections and BOOST button do, and how it compares with the NOCO GB70 and GB40. We state no prices, no star ratings and no hands-on test results we cannot back up: every specification comes from GOOLOO’s listing and manuals, or from our live reviews of the NOCO models. The Quick Pick table below has the short version.
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| Pick | Product | Why it stands out | Check Price |
|---|---|---|---|
| Overall Winner | GOOLOO GP4000 Jump Starter 4000A | 4000A peak, all gas and up to 10.0L diesel, power bank and LED light in one kit | |
| Best Budget | NOCO Boost GB40 1000A Jump Starter | Smallest and lightest of the three — enough for cars and small SUVs | |
| Premium Pick | NOCO Boost GB70 2000A Jump Starter | 2000A peak, IP65 housing, NOCO’s UltraSafe protection and 1-year warranty |
Table of Contents
What the GOOLOO GP4000 Is — and What It Is Not
The GP4000 is a battery jump start portable pack in the literal sense: the battery, the clamps and the brains live in one orange box. Inside is a 12V lithium-polymer battery, with a complete kit around it: a smart jumper cable with heavy-duty clamps, a USB to Type-C cable, a cigarette-lighter socket adapter, and a hard EVA storage case for the trunk.
The clamps deserve a mention of their own. They arrive as a single smart cable — in effect, portable jumper cables with a control box that watches the connection for you. Its indicator lights tell you whether the hookup is right before you crank: a solid green light means go, while blinking lights mean something is wrong and you should check the clamps first. That guidance matters, because most jump-start mistakes are connection mistakes.
Just as important is what the GP4000 is not. It is not a battery charger or maintainer — it gives a dead-but-healthy battery the surge it needs, and it will not revive a battery that is worn out or damaged. It is not a tire inflator either: its sibling, the GOOLOO A3, is the model with a built-in air compressor, while the GP4000 is jump-focused instead. Nor is it a substitute for a battery test.
Power and Engine Fit: 4000A for All Gas and Up to 10.0L Diesel
Peak current is the number that decides whether a jump starter can crank your engine, and the GP4000 jump starter’s headline figure is 4000A. GOOLOO rates it for all gasoline engines and diesel engines up to 10.0L, with a starting current of 800A. That covers the cars and crossovers most households own, plus full-size pickups, large SUVs, RVs, tractors, cargo vans and light-duty diesel trucks. It also covers motorcycles, ATVs, snowmobiles and yachts — all 12V systems.
Two cautions belong here. First, peak-amp claims vary wildly between brands and are not measured to a single common standard, so treat cross-brand amp comparisons as rough. GOOLOO’s engine ratings are the more practical comparison point. Second, the GP4000 is a 12V unit for single-battery systems — not 24V systems or dual-battery setups. Check your engine size and vehicle voltage before you buy, not after the battery dies.
Capacity is the quieter half of the story. The Amazon listing rates the GP4000’s internal battery at 88.8Wh, which is the figure this review uses. That capacity is why the GP4000 is a trunk item rather than a glovebox one: at about 1.7 kg it is heavier than the pocket-size NOCO GB40, though lighter than the 5.0 lb NOCO GB70.
How to Jump Start a Car Battery with the GP4000
Learning how to jump start a car battery with a portable unit is straightforward, and the GP4000 changes only one thing about the old routine: the other vehicle is replaced by the box in your hand. You jump start from battery power already stored in the pack itself, so there is no flagging down a stranger. The order still matters, so follow the steps exactly, and always follow the user guide that ships with your unit.
First, check the GP4000 is charged — the manual says to make sure it is over 50% charged. Connect the smart jumper cable to the unit, then the red clamp to the positive (+) terminal of the dead battery, and the black clamp to a solid, unpainted metal ground on the engine block or chassis, away from the battery itself. When the cable’s green light is on and solid, start the vehicle. If it does not start within a few seconds, stop, wait a minute, and try once more.
If the battery voltage is extremely low, the GP4000 has a BOOST button for exactly that case: press it and try again, following the manual’s instructions for a forced start. Once the engine is running, disconnect promptly — black clamp off the ground first, then red off the positive terminal — and drive for a good run so the alternator can recharge the battery. Then have the battery tested soon. Never jump a battery that is cracked, leaking or frozen.
Safety, SuperSafe Protections, and the BOOST Button
Jump-starting involves real current, so the safety design of a car jump starter matters as much as the amps. GOOLOO’s SuperSafe system builds ten types of protection into the GP4000: reverse polarity, short circuit, overheating, overvoltage, undervoltage, overload, deep discharge, overcurrent, explosion-proof protection, and protection against ultimate low power consumption. In plain terms, the unit refuses a dangerous connection rather than passing current through it.
The clamps themselves are all-metal, built for a firm grip on terminals that may be corroded or awkwardly placed, and the smart cable’s indicator lights give you a read on the connection before you crank. That combination is what makes the GP4000 forgiving for a driver who jumps a vehicle once a year rather than once a week.
The BOOST button is the other half of the safety story. A deeply discharged battery can sit below the voltage where a jump starter normally recognises a battery at all, and BOOST mode forces a start attempt anyway. Use it as the manual describes, not as a first resort. The unit is rated to operate from -20°C to 60°C, so cold garages and hot trunks are within its working range.
Power Bank, Charging, and the 15V DC Output
Beyond jumping, the GP4000 works as a portable power bank. It has two USB outputs — a standard 5V/2.1A port and a Quick Charge 3.0 port that steps up to 9V/2A or 12V/1.5A for compatible phones and tablets — plus a USB-C port that works both ways at 15W (5V/3A), charging the unit itself or topping up another device. Stranded with a dying phone, the GP4000 can recharge it — genuinely useful when the same dead battery has already cost you a roadside wait.
The feature truck and RV owners tend to use most after jump starting is the 15V/10A DC output, rated up to 150W. Through the included cigarette-lighter socket adapter it can power 12V auto devices such as an air compressor, a car fridge or a car vacuum. Check the device’s power draw against the 150W limit before you rely on it, and note the cigarette lighter itself is not included. It is a useful roadside power source, not a portable power station.
Then there is the flashlight: a built-in LED with three modes — solid, strobe and SOS — enough to see terminals in the dark or signal for help. GOOLOO backs the GP4000 with an 18-month warranty and lifetime technical support, and rates the battery for 1000+ charge cycles.
Keeping it ready takes a little routine. A full charge takes 6–8 hours through a 5V/3A source, and the wall charger is not included — you charge it from a suitable USB or car charger you already own. In storage the pack holds its charge for over 12 months on standby, but the manual still suggests recharging it every 1–3 months, so top it up every few months, before winter and before any long trip.
GOOLOO GP4000 vs the Alternatives: Other Car Jump Starters Portable Packs
The obvious comparison is the NOCO Boost GB70, the premium alternative most buyers shortlist next to the GP4000. The GB70 delivers 2000A peak against the GP4000’s 4000A, and is rated for gas engines up to 8.0L and diesels up to 6.0L, against the GP4000’s all-gas and 10.0L diesel rating. Where the GB70 answers back is refinement: an IP65-rated housing, NOCO’s UltraSafe spark-proof clamps, a 400-lumen LED with seven modes, and a 1-year warranty from an established US brand. See our NOCO GB70 review and our GB40 vs GB70 head-to-head.
The smaller NOCO, the GB40, is the budget end of the same comparison. It delivers 1000A peak — a quarter of the GP4000’s figure — and is rated for gas engines up to 6.0L and diesels up to 3.0L, with up to 20 jump starts per charge from a 24Wh battery and a 100-lumen flashlight. What it gives up in power it returns in size: at 1.65 lbs it is a glovebox item where the GP4000 is a trunk item. See our full GB40 review.
Between the three, the choice comes down to the engine in your driveway. The GP4000 wins on raw coverage: the highest peak current, the widest diesel rating, and the 15V DC output neither NOCO offers. The GB70 wins on build and brand confidence: the IP65 housing and NOCO’s track record suit a buyer who wants refinement over raw power. The GB40 wins on size and simplicity for smaller vehicles. Peak-amp claims are not measured to a single common standard, so treat the amp gap as rough — on engine ratings, the GP4000 leads.
Who Should Buy It — and Who Should Skip It
Buy the GP4000 jump starter if you drive a full-size truck, a large SUV, an RV or a diesel within its 10.0L rating — or if one unit must cover a whole driveway of vehicles. It also suits drivers who want the extras: power-bank charging, the 15V DC output for a 12V compressor or fridge, and the LED light for night-time work.
Skip it if your biggest engine is a four-cylinder sedan — the GB40 covers that for less money and less weight, and the extra amps buy you nothing. Skip it too if you want a built-in tire inflator: the GOOLOO A3 is the model with the compressor, not this one. And skip it if your vehicle runs a 24V or dual-battery setup, or your diesel is over 10.0L: the GP4000 is a 12V single-battery unit.
Verdict
The GOOLOO GP4000 is the right choice for the driver its ratings describe: a car jump starters portable pack with 4000A peak current, all gas engines and diesels up to 10.0L, a useful power bank, a 15V DC output and an 18-month warranty. Its limits are equally clear: it is bulkier than the pocket-size NOCO GB40, it has no built-in air compressor, and its wall charger is not included. Accept those three facts and this is a strong buy for big-engine drivers; if any is a deal-breaker, the NOCO alternatives are the honest next step.
Frequently Asked Questions
Can the GOOLOO GP4000 jump start a diesel truck?
Yes — if the diesel engine is 10.0L or smaller. GOOLOO rates the GP4000 for all gasoline engines and diesel engines up to 10.0L, which covers most light-duty and many heavy-duty diesel pickups. It is built for 12V single-battery systems only, so it will not work on a 24V system or a dual-battery setup. If your diesel is larger than 10.0L, the GP4000 is not rated for it and you need a bigger unit.
How do you use the GP4000 to jump start a dead battery?
The GP4000 carries its own starting power, so no second vehicle is needed. Make sure the unit is over 50% charged, connect the smart cable, then the red clamp to the positive (+) terminal and the black clamp to a solid metal ground away from the battery. When the cable’s green light is on and solid, start the vehicle. If the battery voltage is extremely low, press the BOOST button and try again. Disconnect black first, then red, once the engine is running.
How long does it take to recharge the GP4000?
A full charge takes 6–8 hours through a 5V/3A source, and the wall charger is not included, so you charge it from a suitable USB charger or car charger you already own. In storage the pack holds its charge for over 12 months on standby, but the manual suggests recharging it every 1–3 months, so check the charge every few months and top it up before winter and before any long trip.
Can the GP4000 charge a phone?
Yes. The GP4000 has two USB outputs — a standard 5V/2.1A port and a Quick Charge 3.0 port — plus a USB-C port that works both ways at 15W, so it can recharge phones and tablets as a portable power bank. It also has a 15V/10A DC output, rated up to 150W, for 12V auto devices such as an air compressor, a car fridge or a car vacuum.
What is the difference between the GP4000 and the GOOLOO A3?
The GP4000 and the GOOLOO A3 are different models for different buyers. The GP4000 is the jump-focused unit: 4000A peak current, rated for all gas engines and diesels up to 10.0L, with a power bank and a 15V DC output but no built-in inflator. The A3 is a smaller 3000A jump starter with a built-in air compressor, for drivers who want inflation and jumping in one device. Choose the GP4000 for starting power and engine coverage; choose the A3 if a built-in tire inflator matters more than the extra amps.
Should I buy the GP4000 or the NOCO GB70?
On the ratings, the GP4000 leads: 4000A peak against the GB70’s 2000A, all gas and up to 10.0L diesel against the GB70’s 8.0L gas and 6.0L diesel, plus a 15V DC output the GB70 does not offer. The GB70 answers with refinement: an IP65-rated housing, NOCO’s UltraSafe protection, a brighter 400-lumen flashlight, and the track record of an established US brand. If the biggest engine rating and the DC output matter most, choose the GP4000; if build quality, weather sealing and brand confidence matter most, choose the GB70.
