GOOLOO GT4000S Named Best Jump Starter by CNN Underscored

CNN Underscored named the GOOLOO GT4000S its top jump starter after hands-on testing against other portable jump starters, highlighting its starting performance, intuitive controls, safety guidance, charging capabilities, and practical design.

A dead car battery is one of those problems most drivers hope they never encounter. But when it happens, having a reliable portable jump starter in the trunk can mean the difference between getting back on the road quickly and waiting for roadside assistance.

In its hands-on review of the best jump starters, CNN Underscored evaluated the GOOLOO GT4000S based on real-world performance rather than relying solely on advertised peak amperage. The testing included load testing, usability, safety features, charging capabilities, and the overall practicality of the device.

The GOOLOO GT4000S was selected by CNN Underscored as its top pick in its evaluation of portable jump starters. 

CNN's testing looked at how different jump starters performed under demanding conditions and how easy they were to use in real-world situations. The GT4000S stood out for its combination of starting capability, clear operating guidance, safety alerts, charging functionality, and portable design.  

→ Read the full CNN Underscored review

CNN's hands-on evaluation highlighted several features that helped the GT4000S stand out among the jump starters it tested.

The GOOLOO GT4000S is rated at 4,000 peak amps and 800 cranking amps.

Rather than evaluating jump starters solely by their advertised peak current, CNN Underscored conducted carbon pile load testing to measure their performance under controlled conditions.

During CNN's testing, the GT4000S produced approximately 3,500 watts across its trials. CNN found this output sufficient for starting most of the vehicles tested, while noting that drivers with particularly large diesel trucks may require a more powerful jump starter.

The CNN testing results provide additional real-world context alongside GOOLOO's published specifications.

A jump starter needs to be easy to operate, especially when it is being used during an unexpected roadside emergency.

The GT4000S features a large display that shows the remaining battery level as an exact percentage. It also provides a clear Ready indication when the unit is prepared for use.

The back of the device includes three-step operating instructions and a troubleshooting chart, giving drivers quick access to essential guidance without requiring them to search through a separate manual.

This combination of a visible display and built-in instructions can make the jump-starting process easier to understand, particularly for drivers who do not regularly use portable jump starters.

The GT4000S is designed with visual and audible alerts to help drivers identify common connection issues.

For example, an incorrect clamp connection can trigger a warning. A flashing Ready indicator can also indicate that the vehicle battery is too depleted for the jump starter to detect sufficient voltage.

For extremely low-voltage batteries, the dedicated Boost button provides an additional way to assist with starting when used according to the product instructions.

These features are designed to provide drivers with more guidance during the jump-starting process rather than simply supplying power without feedback.

CNN also highlighted the GT4000S's approximately 10- and 11-inch leads.

Cable length can make a practical difference when positioning a jump starter around an engine bay. The additional reach provides greater flexibility when connecting the clamps to a vehicle battery.

The GT4000S is designed to remain useful even when it is not being used to start a vehicle.

It includes multiple charging options, including USB ports, a 15V DC port, and a 100W USB-C in/out port.

CNN found the 100W USB-C connection particularly useful for quickly recharging the jump starter after repeated testing.

The GT4000S also features a built-in flashlight, providing additional illumination when checking a vehicle or connecting jumper clamps in low-light or nighttime conditions.

When evaluating a jump starter, it is important to distinguish between third-party test results and the manufacturer's published specifications.

Actual jump-start performance and the number of starts available from a single charge can vary depending on vehicle type, battery condition, temperature, and other operating conditions.

The approximately 3,500-watt figure comes from CNN Underscored's testing and should not be interpreted as a GOOLOO-published product specification.

CNN Underscored's evaluation highlights an important consideration when choosing a portable jump starter: peak amperage is only one part of the overall experience.

A useful emergency jump starter also needs to be straightforward to operate, provide appropriate safety guidance, and remain practical after the vehicle has been started.

The GT4000S combines these elements in one portable device:

Together, these features make the GT4000S more than a single-purpose emergency starting device.

Hands-on testing can provide useful context that specifications alone cannot.

A jump starter may advertise a high peak current, but drivers also need to consider how easily the device can be operated, how it communicates potential connection problems, how quickly it can be recharged, and whether it provides useful functions beyond jump starting.

CNN Underscored's evaluation considered these practical aspects alongside starting performance.

For GOOLOO, the recognition reinforces the GT4000S's focus on combining power, usability, safety guidance, and everyday practicality in a portable jump starter.

Based on CNN Underscored's testing, the GT4000S offers a balance of starting performance, ease of use, charging functionality, and portability.

It is designed for drivers who want a powerful emergency starting solution without carrying a larger professional-grade starting system.

At the same time, drivers should always check the requirements of their specific vehicle before purchasing or using a jump starter. Engine size, fuel type, voltage, battery condition, and operating temperature can all affect jump-starting performance.

The GT4000S is designed for 12V vehicles and is rated by GOOLOO for gasoline engines up to 12.0L and diesel engines up to 10.0L.

The GT4000S review also highlights several factors drivers should consider when comparing portable jump starters.

Choose a jump starter that supports your vehicle's voltage, engine size, and fuel type. The GT4000S is designed for 12V vehicles and is rated by GOOLOO for gasoline engines up to 12.0L and diesel engines up to 10.0L.

Peak amperage is an important specification, but it should not be the only factor considered. Cranking current, real-world testing, vehicle compatibility, and battery condition can all affect actual starting performance.

A clear display, operating instructions, safety alerts, and troubleshooting guidance can make a significant difference when using a jump starter during an emergency.

A jump starter can provide value beyond starting a vehicle. USB charging, 100W USB-C charging, DC output, and an integrated flashlight can make the device useful as part of a broader emergency or roadside kit.

A jump starter needs to have sufficient charge when an emergency occurs. Drivers should regularly check the device's battery level and recharge it according to the manufacturer's recommendations so that it remains ready when needed.

The GOOLOO GT4000S combines high starting capability with intuitive controls, built-in safety guidance, portable charging, and emergency lighting.

Its recognition by CNN Underscored follows hands-on testing that evaluated not only starting performance but also usability, charging functionality, and practical design.

Whether you're preparing for a road trip, upgrading your emergency car kit, or simply looking for additional peace of mind on the road, the GT4000S is designed to be ready when you need it.