Gooloo GP4000 vs GT4000S: Which Is Better? (October 2026)

On this page (9 sections)

1. Gooloo GP4000 vs GT4000S: what are the main differences?
2. Which jump starter is better for charging devices?
3. How do the GP4000 and GT4000S controls compare?
4. Which model fits your engine?
5. Which one is easier to store in a vehicle?
6. What care and temperature limits should you plan for?
7. What mistakes should you avoid with either Gooloo model?
8. Is the Gooloo GP4000 or GT4000S the better buy?
9. Related reading

For the Gooloo GP4000 vs GT4000S, choose the GT4000S for 100W USB-C charging and a status screen, or the GP4000 for its higher stated capacity and BOOST button. Both are 4000A, 12V jump starters, but they suit different charging habits and storage needs.

The GP4000 has a 24,000 mAh battery and a BOOST button for very low battery voltage. The GT4000S has a 20,000 mAh battery, up to 100W two-way USB-C charging and a 3.2-inch status screen.

If you need less output, the Gooloo GP3000 is a separate option with guidance for 9.0L gas and 7.0L diesel engines. Our scores weigh each model's specs and features against the needs of this comparison.

Gooloo GP4000 vs GT4000S: what are the main differences?

The GT4000S adds fast charging and visible status, while the GP4000 has greater stated battery capacity. Both have 4000A peak output for 12V vehicles, so the deciding factors are charging, controls, engine guidance and the space you have.

A larger capacity figure may appeal if you want more stored capacity on paper, but it doesn't by itself tell you how many starts you'll get in your conditions. Charging speed, vehicle needs and the unit's charge level also matter.

The GT4000S is thicker and has lower stated capacity, but its screen shows product status and its USB-C port supports much faster charging. The GP4000 is thinner and includes a BOOST button intended to force a restart when battery voltage is extremely low.

Gooloo describes both models for 12V vehicles. Check your vehicle manual and the jump starter instructions before use, since peak output alone doesn't confirm a match for every engine or battery condition.

Which jump starter is better for charging devices?

Pick the GT4000S if you want to charge a laptop or replenish the jump starter quickly. Its USB-C port supports up to 100W in both directions, and the package includes a 100W car charger.

Gooloo says a full charge can take 1.2 hours with a suitable 100W charger, and 5 minutes of charging can provide enough power to start a car. Treat those as brand claims; charger choice and conditions can affect charging time.

The GT4000S can charge laptops through USB-C at up to 100W. It also has three USB ports and a 15V/10A DC output for compatible devices such as tire inflators and inverters.

The GP4000 offers dual USB ports, including one fast-charging port, plus USB-C rated at 5V/3A. It can recharge through USB-C, but it doesn't have the GT4000S's stated 100W charging capability.

Choose by what you expect to power in an emergency. If you mainly want a Gooloo unit for vehicle starts and occasional phone charging, compare these models with the options in our guide to the best Gooloo jump starters.

How do the GP4000 and GT4000S controls compare?

The GT4000S gives you a screen for status, while the GP4000 has a BOOST button for very low battery voltage. The screen helps you check the unit's state, and BOOST addresses a specific low-voltage starting situation.

Before connecting either unit, confirm that it has sufficient charge and that the vehicle uses a compatible 12V system. Attach the clamps firmly to clean battery terminals and follow the device's status indications and instructions.

Don't press BOOST simply because a vehicle fails to start. First check clamp placement, charge level and the troubleshooting guidance, then follow the jump starter's instructions for when BOOST is appropriate.

Use the steps in our car jump starter guide to understand the connection sequence. A clear sequence helps reduce avoidable connection errors when you're working in poor light or under stress.

Which model fits your engine?

The GT4000S has the higher stated gasoline engine limit, while both are described for diesel engines up to 10.0L. Gooloo describes the GP4000 for gasoline and diesel engines up to 10.0L, and the GT4000S for gasoline engines up to 12.0L and diesel engines up to 10.0L.

Those limits are guidance, not a promise that a jump starter will start every vehicle at the upper end. Battery condition, temperature, charge level and the vehicle's own requirements all affect whether a start is possible.

Check the owner's manual for your vehicle's battery and jump-start requirements before choosing based on engine size. For a large truck or SUV, read which jump starter works for a V8 truck or SUV to compare the factors beyond peak amps.

The GP3000 may suit a vehicle within its stated range of 9.0L gas or 7.0L diesel. It has 3000A peak output, BOOST mode for batteries below 9V and a 15V DC port, so it's a lower-output alternative rather than a direct match for the two 4000A models.

Which one is easier to store in a vehicle?

The GP4000 is thinner, while the GT4000S comes with a storage bag and a 100W car charger. Measure your storage space and account for the cables and accessories you want to keep with the unit.

The GP4000 measures 3.92 x 8.97 x 1.49 in and weighs 3.9 pounds. Its package includes an EVA case, jumper cable, USB to Type-C cable and cigarette lighter socket adapter.

The GT4000S measures 9.05 x 3.93 x 2.12 in. Its package includes a storage bag, heavy-duty jumper cables, USB cables, a cigarette lighter adapter and a 100W car charger.

Their length and width are similar, but the GP4000 is thinner. If you plan to carry the jump starter in a tight compartment, measure that space before choosing and leave room to remove the cables without forcing them.

What care and temperature limits should you plan for?

Both models are specified for operation and storage from -4°F to 140°F, but the GT4000S has a narrower charging range. Its charging temperature range is 14°F to 113°F, so don't assume the operating range also applies while charging.

Gooloo recommends charging the GP4000 every 2 to 3 months if it has been idle for an extended period. For the GT4000S, the guidance is to charge it fully before first use and recharge it at least every 3 months during long-term storage.

Keep either unit away from prolonged heat, moisture and direct sunlight. A reminder on your calendar can help you check charge before a long trip or the start of winter, rather than discovering a low battery during an emergency.

For broader cold-weather preparation, see our winter car emergency kit guide. It helps you plan for roadside needs beyond the jump starter.

What mistakes should you avoid with either Gooloo model?

The main avoidable mistakes are choosing from peak amps alone, skipping the first charge and connecting clamps without checking the instructions. A careful setup matters as much as the model choice.

Don't assume either unit fits a vehicle just because it has a 4000A rating. Confirm the vehicle's 12V system, engine guidance and jump-start procedure in the owner's manual and the device instructions.

For the GT4000S, charge the unit fully before first use and use a compatible charger and cable for high-speed USB-C charging. For the GP4000, keep up with periodic charging during long idle periods and use BOOST only as directed for very low battery voltage.

Connect to clean terminals with the clamps firmly in place, and follow the unit's indicators before attempting a start. If the vehicle still won't start, stop and consult the troubleshooting instructions instead of repeatedly trying different connections.

Is the Gooloo GP4000 or GT4000S the better buy?

Choose the GT4000S if you want fast USB-C charging, laptop power and a screen; choose the GP4000 if you value its higher stated capacity, thinner shape and BOOST button. The GT4000S also has the higher stated gasoline engine limit, while both are described for diesel engines up to 10.0L.

Skip the GT4000S if you won't use its fast charging or status screen and prefer the GP4000's stated capacity. Skip the GP4000 if fast recharging and laptop charging are central to your needs.

Before buying, compare the engine guidance with your vehicle manual, check that the unit fits your storage space and decide which charging features you'll actually use. For a broader overview of vehicle jump starters, read what to know before buying a car jump starter.

Related reading

• Best Gooloo jump starters
• Gooloo GT4000S jump starter review
• Jump starters for V8 engines
• What to know before buying a car jump starter

Frequently asked questions

Is the Gooloo GP4000 or GT4000S better?

The GT4000S suits drivers who want 100W two-way charging, a 3.2-inch status screen and an included 100W car charger. The GP4000 suits drivers who prefer its higher stated 24,000 mAh capacity and BOOST button.

Both are 4000A, 12V jump starters.

Do the GP4000 and GT4000S have the same peak output?

Yes. Both are specified at 4000A peak output for 12V vehicles.

Gooloo describes the GP4000 for gasoline and diesel engines up to 10.0L, and the GT4000S for gasoline engines up to 12.0L and diesel engines up to 10.0L.

Which Gooloo jump starter charges faster?

The GT4000S supports up to 100W two-way USB-C charging. Gooloo says a full charge can take 1.2 hours with a 100W charger.

The GP4000 has a USB-C port rated at 5V/3A, with no comparable 100W charging claim.

Can the GT4000S charge a laptop?

The GT4000S can charge laptops through its USB-C port at up to 100W. Check your laptop's charging needs and use a compatible USB-C cable.

The GP4000's stated USB-C output is 5V/3A.

Which one should I choose for a V8?

Both models are 4000A, 12V jump starters, but engine size alone doesn't confirm compatibility with your vehicle. Check the owner's manual and jump starter instructions for your engine, battery condition and connection steps.

Our guide to jump starters for V8 engines explains what to compare.