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Short version: the GOOLOO GP4000 is the jump starter owners reach for when they want maximum cranking power without paying premium-brand money. Owners consistently report that its 4,000 peak amps fire big gas and diesel engines on the first try, and that USB-C Power Delivery makes it a genuinely useful power bank too — which is why it earns a place in our best portable jump starter roundup. It is rated around 4.6 across tens of thousands of reviews. The build is not as premium as the big names, and the honest complaints below matter, but for power-per-dollar it is a standout.
What the GOOLOO GP4000 Is
The GP4000 is GOOLOO's high-output lithium jump starter, headlined by a 4,000 peak amp rating that owners repeatedly note is at the top end of the portable category. In practice, reviewers report it cranks large gas V8s and diesel engines with room to spare — the same heavy-duty job the premium units target, at a noticeably lower price.
Where it modernizes the formula is charging: USB-C Power Delivery lets it recharge faster and act as a proper power bank for phones and even some laptops, a feature owners contrast favorably with the dated micro-USB ports on some rivals. It also packs a bright LED work light with multiple modes and standard safety protections against reverse polarity and short circuits. This is the value enthusiast's emergency tool — big power, modern ports, sensible price.
Who It's For
If you want the most cranking headroom for your money — for a truck, diesel, SUV or a garage full of vehicles — the GP4000 is aimed at you. Owners who balked at premium pricing but still wanted to start a big engine on the first try consistently land here and report being satisfied. The USB-C power-bank function makes it double as a road-trip charging brick, which buyers appreciate.
It is a poorer fit for someone who prioritizes a premium, rugged feel and a long brand track record over raw specs — those buyers tend to pay up for a NOCO. And like any lithium jump starter, it needs periodic recharging to be ready in an emergency. If you are weighing your options, start with the Jump Starters hub, and see the portable jump starter roundup for how the GP4000 compares head-to-head.
What Owners Love
Across a large pool of reviews, the praise is consistent:
- Massive cranking power. The top-cited win. Owners repeatedly report it starting big diesels and V8s on the first attempt, often after weaker units failed.
- USB-C convenience. Reviewers single out the USB-C Power Delivery for faster recharging and for charging phones and laptops — a real step up from micro-USB rivals.
- Value for the power. The recurring theme: it delivers premium-tier cranking ability at a mid-tier price, which owners describe as the main reason they chose it.
- Bright, useful light. The multi-mode LED work light gets steady praise as a genuinely handy roadside extra.
Common Complaints
An honest read of the reviews turns up a consistent set of gripes:
- Build feels less premium. The most common caveat. Owners describe the housing and clamps as functional but a notch below premium brands in fit and finish.
- Bulky and heavy. The high capacity comes with size and weight, and some owners find it less pocketable than they expected for a portable unit.
- Self-discharges if neglected. Like all lithium packs, it needs topping up. Owners who left it for months report finding it low when they needed it.
- Instructions could be clearer. A recurring minor gripe is that the manual and labeling are terse, leaving first-time users guessing about charging and mode buttons.
- Occasional faulty or degrading units. A small number of owners report a unit that arrived weak or lost capacity over time. It is the exception across the review pool, and warranty generally covers it, but it appears often enough to mention.
Alternatives Worth a Look
The GP4000 is our value-power pick, but depending on what you want:
- NOCO GB70 — the premium alternative. Owners who prioritize rugged build, refined safety and a long reputation pay more for the NOCO.
- A smaller GOOLOO or NOCO GB40 — the compact pick. For a small car, a lower-amp unit is lighter, cheaper and plenty of power.
- A jump starter with an air compressor — the do-it-all roadside choice. Owners who also want to inflate tires roadside choose a combo unit over a pure jump starter.
For the full ranked comparison of all of these, see the best portable jump starter roundup, and browse the Jump Starters hub for maintainers and chargers that keep your battery from dying in the first place.
The Verdict
The GOOLOO GP4000 makes a strong case as the value power pick. Owners consistently report that its 4,000 peak amps start big gas and diesel engines on the first try, that USB-C Power Delivery makes it a genuinely useful modern power bank, and that it does all of it for less than the premium names. The honest trade-offs are the ones you would expect from a value play: the build feels a step below premium, it is bulky, and like any lithium unit it needs periodic recharging. Accept those, keep it topped up, and you get heavy-duty starting power that punches well above its price — reflected in its ~4.6 rating across tens of thousands of reviews.
Recommended Options
Best for maximum cranking headroom without premium-brand pricing
- 4,000 peak amps — starts big gas V8s and diesels
- USB-C Power Delivery for fast recharge and power-bank use
- Bright multi-mode LED work light
- Standard reverse-polarity and short-circuit protection
Why buy it: the reviewed pick — premium-tier cranking power at a mid-tier price, with modern USB-C ports the older rivals lack.
Best for buyers who value rugged build and a long track record
- 2,000 amps — starts most gas and diesel engines
- Rugged, refined build from the category leader
- Massive, long-standing owner base
- Costs more than the GOOLOO for less peak-amp headroom
Why buy it: the premium alternative — the pick for owners who prioritize NOCO’s build quality and reputation over raw peak-amp numbers.
Best for a small car where a big unit is overkill
- 1,000 amps — plenty for most cars and small SUVs
- Compact, light and easy to keep in the glovebox
- One of the best-selling jump starters ever made
- Not for large diesels — step up for those
Why buy it: the compact pick — lighter and cheaper with more than enough power for a normal car, when you do not need diesel-cranking headroom.
Best for a rugged unit with a smart display and quick recharge
- 2,000 amps with a clear LCD charge display
- Fast USB-C recharge of the unit itself
- Rugged case and strong owner rating
- A popular cross-shop against GOOLOO and NOCO
Why buy it: the middle-ground alternative — big cranking power plus a helpful display and fast recharge, sitting between the value GOOLOO and the premium NOCO.
Prices are pulled from Amazon and were accurate as of Aug 22, 2026, 7:14 PM EDT. Product prices and availability are subject to change — the live price is shown on Amazon.