NOCO vs Gooloo: Which Jump Starter Is Better? (November 2026)

On this page (10 sections)

1. NOCO vs Gooloo: which fits your engine?
2. Who should buy the NOCO GB40, and who should skip it?
3. Who should buy the Gooloo GP4000, and who should skip it?
4. Which kit will fit your storage space?
5. Which charging features matter for daily use?
6. When is the Wolfbox 4000A a better alternative?
7. How should you prepare either pack before an emergency?
8. Which mistakes can stop a jump starter from helping?
9. How do you keep the pack ready between uses?
10. NOCO vs Gooloo: make the final choice

Choose the NOCO GB40 for a lighter everyday kit and the Gooloo GP4000 for larger compatible engines. The useful NOCO vs Gooloo choice starts with your vehicle, then comes down to carrying weight, storage and how you'll keep the pack charged.

This comparison covers these specific models, rather than every jump starter either brand makes. A higher position here doesn't make the GB40 suitable for an engine outside its limits.

Both supply emergency starting power for compatible 12V vehicles and can charge portable devices. If you're still deciding what belongs in your roadside kit, start with our portable jump starter guide.

NOCO vs Gooloo: which fits your engine?

The GP4000 covers larger engines, while the GB40 suits drivers who can stay within its narrower limits. Check engine displacement, fuel type and battery-system voltage before comparing extra features.

NOCO rates the GB40 for gasoline engines up to 6.0L and diesel engines up to 3.0L. Gooloo states that the GP4000 supports all gasoline engines and diesel engines up to 10.0L, within its compatible 12V applications.

For a small gasoline car, either model may cover the engine, so carrying weight and storage become useful tie-breakers. For a diesel above the NOCO's limit, choose a suitable larger unit rather than assuming a smaller pack will manage.

A shared household kit needs to cover the most demanding vehicle you'll use it on. Check each vehicle separately, especially if the household includes both a compact car and a diesel pickup.

Don't assume that every truck, RV or tractor has the same electrical system. Neither unit is a choice for a 24V starting system, and vehicle instructions take priority over a broad vehicle-type description.

Our guide to jump starting a diesel truck explains the extra checks to make before connecting a pack.

Do peak amps settle the NOCO vs Gooloo choice?

Peak amps are a supporting spec, not the whole buying decision. The GB40 has 1000A peak output, compared with 4000A for the GP4000.

That fourfold difference doesn't mean four times the starting ability in your car. Peak output doesn't describe how long a pack can sustain a load or how a particular battery will respond.

Cold conditions, poor clamp contact and a worn battery can make starting harder. A larger compatible pack can provide room in your choice, but it can't repair a failed battery or charging fault.

Read how many amps you need for a jump starter if you're comparing several models with very different numbers.

Who should buy the NOCO GB40, and who should skip it?

Buy the GB40 for a car kit you want to carry easily, provided it covers your engine. It's a sensible choice when emergency starting is the main job and you don't need the Gooloo's wider engine coverage.

Its 2.4 lb weight suits someone who carries the pack from home to a parking area or moves it between compatible vehicles. Lower weight also helps if lifting and handling a roadside kit is a concern.

The spark-proof connections and reverse-polarity protection are useful safeguards. They support careful use, while the vehicle manual still determines where the clamps belong.

Skip the GB40 if any vehicle you plan to assist exceeds its engine limits. Also skip it if you mainly want a pack for charging multiple devices during trips and the Gooloo's port arrangement better matches that use.

The NOCO GB40 review takes a closer look at this model. Choose it for a clear match to your needs, rather than buying by brand name alone.

Who should buy the Gooloo GP4000, and who should skip it?

Buy the GP4000 for broader engine coverage or a kit shared across several compatible vehicles. Its included case and charging ports also suit drivers who keep their emergency gear together for travel.

The pack weighs 3.9 lb, so it asks you to carry more than the NOCO. That trade-off is easier to accept when the kit stays in a vehicle and its larger engine allowance serves a real need.

Gooloo includes smart jumper cables with all-metal clamps and describes 10 built-in protection types. Don't choose between safety systems by counting protections alone; correct connections and clear operating instructions matter more than a longer feature list.

Skip it if your engine fits the GB40 comfortably and reducing carrying weight is your main goal. Also plan for a suitable charging source, because the GP4000 doesn't include a wall charger.

Our Gooloo GP4000 review covers its features in more detail. Its wider engine coverage is the main reason to choose it here.

Which kit will fit your storage space?

The Gooloo is thinner, while the NOCO is lighter. Measure the space you intend to use instead of treating “compact” as a promise that either complete kit will fit.

The GB40 measures 4.61 x 8.19 x 4.21 inches, in depth, width and height. It includes heavy-duty clamps, a USB-C charging cable and a microfiber storage bag.

The GP4000 measures 3.92 x 8.97 x 1.49 inches, in the same order. Its kit includes a USB-to-Type-C cable, a cigarette lighter socket adapter and an EVA storage case.

Those measurements describe the units, so leave room for accessories. A narrow door pocket may accept a pack but leave its clamps loose, where they can catch on other items.

Keep the complete kit secured and accessible when the vehicle has no power. Avoid a location that requires moving heavy luggage or operating a powered compartment before you can reach it.

The NOCO has an IP65-rated housing with rubberized over-molding. That protection is useful around roadside dirt and splashes, but it doesn't make wet connections or submerged use safe.

Which charging features matter for daily use?

Choose the GP4000 for its dual USB outputs, or consider the Wolfbox below if fast pack recharging is a priority. For occasional emergency starting, a charging routine matters more than extra ports.

The GB40 can supply power to phones and tablets, and NOCO gives a 3-hour recharge time. Its 100-lumen flashlight has 7 modes, including SOS and strobe.

The GP4000 has 2 USB outputs, one with fast-charging support, plus a 5V/3A USB-C charging port. It also has a built-in flashlight for working in low light.

Using either pack as a power bank draws from the energy available for starting. Recharge after device use, especially before leaving the kit in a vehicle for an extended period.

Don't assume any USB cable and wall adapter will deliver the expected charging speed. Match the charging setup to the model's instructions, and check the indicators before packing it away.

Our guide on how to charge a jump starter explains how to build that routine. Keep the correct cable with the kit so charging doesn't become a search for missing accessories.

When is the Wolfbox 4000A a better alternative?

Choose the Wolfbox for its status display and fast USB-C charging if those features solve a travel need. It gives you a third option without turning the NOCO vs Gooloo choice into a contest over peak output.

The Wolfbox supports gasoline and diesel engines under 10L, weighs 3 lb and has an HD LCD status display. That “under” limit matters if your engine sits exactly at the boundary.

Its 65W USB-C input/output port supports device charging and pack recharging, and a PD65W charger is included. Wolfbox gives a full recharge time of 1.3 hours with the appropriate setup.

The included charger is useful for someone who wants a complete charging setup from the start. The screen also makes pack status easier to check before departure.

Skip this alternative if lighter carrying matters most or you won't use its charging features. Wolfbox provides a 2-year warranty, compared with NOCO's 1-year limited warranty and Gooloo's 18-month warranty.

Warranty length can help break a close tie, but check coverage and claim requirements. Gooloo also offers lifetime tech support.

How should you prepare either pack before an emergency?

Charge it, read the instructions and locate your vehicle's jump points before you need help. A pack stored with unfamiliar cables is less useful when you're beside a disabled car in poor light.

First, identify the approved connection points in the vehicle manual. Some vehicles use remote jump points rather than requiring direct access to the battery.

Next, check how the pack shows charge level, connection faults and readiness to start. Learn those signals while parked safely, without starting a live jump-start procedure just to explore the controls.

Inspect the cables and clamps for damage, then pack them so they won't be crushed or tangled. Keep the instructions available offline or inside the kit.

Before an actual jump start, turn off the ignition and unnecessary electrical loads as the vehicle manual directs. Secure the pack away from belts, fans and other moving parts.

Follow the prescribed clamp sequence, starting attempt limits and removal steps. Our portable jump starter instructions explain the general process, but the exact model and vehicle instructions control the job.

Which mistakes can stop a jump starter from helping?

The most avoidable mistakes are using a low-charge pack, making poor clamp contact and repeating unsuccessful attempts. More peak output won't solve every no-start problem.

Using BOOST as the first step

Reserve BOOST for the conditions its instructions describe. Gooloo provides this function for very low battery voltage, but a low reading alone doesn't mean a battery is safe to jump.

Don't use it to push past an unexplained fault indication. Recheck the connections and consult the troubleshooting instructions before continuing.

Clamping wherever metal is visible

Use the approved connection points with firm contact. Paint, dirt or corrosion can interfere with the electrical path, and a loosely attached clamp may shift during cranking.

Keep cables clear of moving parts and stop if you can't make a secure connection. Don't bridge terminals with tools or allow the clamps to touch each other.

Treating every no-start as a flat battery

A jump starter helps with insufficient starting power, not every engine fault. If the engine cranks normally but won't run, adding another pack may not address the cause.

Respect the model's attempt limits and rest intervals. Repeated cranking can heat the equipment and drain the pack without getting you closer to a repair.

Jumping a damaged battery

Stop if the battery is leaking, swollen, cracked or suspected to be frozen. Arrange qualified help rather than trying a different pack or forcing a start.

If the vehicle repeatedly needs assistance, investigate the battery and charging system. Our jump starter vs battery charger guide explains which tool serves each job.

How do you keep the pack ready between uses?

Check charge on a schedule and recharge after use. Storage habits are part of the buying decision because either model needs attention between emergencies.

Gooloo advises charging the GP4000 every 2–3 months during extended idle periods. Follow NOCO's maintenance instructions for the GB40 instead of assuming every lithium pack uses the same interval.

Add a calendar reminder and check the clamps, cables and case at the same time. Bring that check forward before a long trip or after using the flashlight or USB outputs.

Follow the storage temperature limits in the manual. An operating temperature range doesn't automatically describe safe long-term storage or charging conditions.

Avoid leaving the pack in direct sun, and don't charge a damaged or unusually hot unit. Keep the ports clean and dry, and let equipment reach the permitted charging temperature before plugging it in.

For winter planning, our cold-weather jump starter guide covers how temperature changes the demands on your kit.

NOCO vs Gooloo: make the final choice

Choose by the hardest job your kit must cover, then use weight and charging features to break the tie. That gives the NOCO vs Gooloo decision a clear order.

• Choose the GB40 for a compatible everyday car when lower carrying weight matters more than broader engine coverage.
• Choose the GP4000 for a larger compatible diesel or a shared vehicle kit that needs its wider engine allowance.
• Choose the Wolfbox when its engine limits fit and an LCD screen, included fast charger and USB-C power features serve your trips.

Before ordering, confirm the engine size and approved jump-start procedure for every vehicle the kit will serve. Then choose a storage spot and set your first charge reminder.

If you want a larger NOCO instead of switching brands, compare NOCO GB40 vs GB70 before settling on your kit.

Frequently asked questions

Is NOCO or Gooloo better for a large diesel?

The Gooloo GP4000 is the better match between these models for a large diesel. Gooloo states support up to 10.0L diesel, while NOCO rates the GB40 up to 3.0L diesel.

Confirm that your vehicle uses a compatible 12V system and follow its approved jump-start procedure.

Is the NOCO GB40 smaller than the Gooloo GP4000?

The NOCO GB40 is lighter, but the Gooloo GP4000 is thinner. Their dimensions are 4.61 x 8.19 x 4.21 inches and 3.92 x 8.97 x 1.49 inches, respectively.

Measure your storage space and allow extra room for the clamps, cables and storage bag or case.

Does Gooloo's higher peak output mean it starts every vehicle better?

No, higher peak output doesn't guarantee better results for every vehicle. Engine size, fuel type, battery condition, temperature and clamp contact all affect a jump start.

Choose a unit that covers your vehicle, keep it charged and follow its instructions rather than treating peak amps as a success guarantee.

Can a jump starter replace a battery charger?

No, a jump starter supplies a short burst of power to help crank an engine. A battery charger restores charge over time.

If your battery keeps going flat, arrange a battery and charging-system check instead of relying on repeated jump starts to keep the vehicle in service.