GOOLOO GT4000S Jump Starter 4000A Car Jumper Starter - Fast 100W

In this review of the GOOLOO GT4000S jump starter, the bottom line is simple: this is a compact, powerful jump starter aimed at drivers who want reliable emergency starts and a versatile portable power bank. The GT4000S stands out because it combines a high 4000A peak cranking capability with a genuine 100W fast-charging capability that can top the unit from 0% to 100% in about 1.2 hours, and in many cases five minutes of charging is enough to deliver a start. For anyone who values quick readiness, multiple output ports, and long standby life, this unit merits close consideration.

Key Features

• 100W fast charge: The included 100W car charger can recharge the jump starter from empty to full in about 1.2 hours, reducing downtime before an emergency.
• High cranking power: With 4000A peak current the GT4000S handles most 12V engines up to about 12.0L gasoline or 10.0L diesel in seconds, suitable for cars, trucks, motorcycles and boats.
• Multiple outputs: Three USB ports plus a Type-C 100W port and a 15V/10A DC output let the unit power laptops, inflators, and other 12V or 15V devices.
• Built-in protections: Ten protection technologies and heavy duty jumper cables reduce risk of sparks and misconnection, making jump-starts safer.
• Informative display: A 3.2-in LED screen shows status and battery level so users can see when the unit is ready and avoid guesswork.
• Long standby: The manufacturer rates up to 24 months standby time, minimizing the need for regular top-ups when stored for emergencies.

Who It's For

The GT4000S is aimed at motorists who want a compact but powerful emergency starter with the convenience of fast recharge and multiple power outputs. It suits owners of SUVs, pickup trucks, RVs, motorcycles, small boats and farm vehicles that fall within the stated engine size limits and who value an integrated power bank and flashlight.

It is less appropriate for users who require an ultra-high capacity professional jump box for repeated heavy commercial use beyond the stated engine range, or for those who dislike maintaining any portable battery at all; occasional users who prefer purely passive tools might look elsewhere.

Pros & Cons

Pros

• High peak cranking current that starts most 12V engines up to the listed sizes quickly and reliably.
• Fast 100W recharge capability that can top the unit rapidly using the included car charger or other fast chargers.
• Versatile outputs and a bright 400-lumen flashlight add utility beyond jump-starting.

Cons

• Some customers report variation in perceived charge speed depending on charger used, so real-world top-up times can vary.
• Not intended as a heavy commercial jump box for repeated starts beyond typical consumer use.

Specifications

Our Verdict

The GOOLOO GT4000S is a strong value for drivers who want a compact, multipurpose jump starter that charges rapidly and doubles as a power bank. Its combination of 4000A peak power, 100W fast charging and a clear LED display makes it a practical emergency tool and day-to-day power source for laptops and accessories, offering reliable performance for most consumer vehicles.

Frequently Asked Questions

How fast can the GT4000S be recharged?
The included 100W car charger can fully recharge the unit from 0% to 100% in about 1.2 hours; shorter bursts of charge may be enough for a single start.

What size engines will it start?
The unit is rated to start most 12V engines up to approximately 12.0L gasoline or 10.0L diesel.

Can it power a laptop?
Yes, the Type-C port supports up to 100W charging, enough to fast-charge many laptops and devices.