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Drivers comparing GOOLOO GT4000S vs NOCO Boost Plus GB40 are looking at two portable lithium jump starters built for very different jobs. The GOOLOO GT4000S is a larger, high-capacity power pack aimed at full-size trucks, medium-duty diesel engines, and 100W USB-C device charging, whereas the NOCO Boost Plus GB40 is a compact 2.4-pound booster built for everyday gas passenger cars and small SUVs up to 6.0 liters.
Picking the wrong unit creates real problems when a battery dies in cold weather. A compact 24Wh booster can run out of reserve capacity if you try to crank a large V8 or a cold diesel engine beyond its 6.0L gas / 3.0L diesel ceiling. On the other hand, buying a larger 4,000A peak pack without reading the owner’s manual can leave you surprised by conflicting engine ratings on the maker’s own page, missing clamp measurements, or the need for a separate 100W wall adapter to get fast recharge speeds.
We reviewed the official product pages, technical data sheets, and owner’s manuals from GOOLOO and NOCO to verify every published number. Where a maker’s documents disagree with each other or leave a specification out, we show both figures and explain how to size your choice safely.
Quick answer
- Choose GOOLOO GT4000S ifYou drive a gas engine above 6.0L or a diesel up to 8.0L, want 800A of 3-second cranking current from a 99.2Wh (manual) / 88.8Wh (comparison page) pack, need 100W two-way USB-C charging, or need to recharge the pack between 14°F and 32°F.
- Choose NOCO Boost Plus GB40 ifYou drive a 12V lead-acid gas vehicle up to 6.0L or a diesel up to 3.0L, want a glovebox-ready 6.7 x 3.2 x 1.7 inch pack weighing 2.4 pounds with clamps, and prefer documented 8 AWG clamp hardware.
- Plan on GOOLOO’s lower engine figureGOOLOO’s GT4000S product page lists 12.0L gas / 10.0L diesel in one section and 10.0L gas / 8.0L diesel in another; always size your purchase around the lower 10.0L gas and 8.0L diesel rating.
- What neither brand prints upfrontGOOLOO lists 800A (3s) starting current in its manual but does not publish clamp cable length or wire gauge; NOCO publishes 8 AWG wire and a 23-inch overall clamp assembly on its replacement clamp spec page but lists cranking amps as not published.
GOOLOO GT4000S vs NOCO Boost Plus GB40 at a glance
The table below compares only specifications verified on GOOLOO and NOCO product pages, data sheets, and owner’s manuals. Any specification omitted by the manufacturer is marked “not published.”
| Specification | GOOLOO GT4000S | NOCO Boost Plus GB40 |
|---|---|---|
| Peak amps | 4,000A (product page & user manual) | 1,000A (specs page & user guide) |
| Cranking / starting amps | 800A for 3s (in user manual; not on product page) | Not published |
| Rated gas engine size | 12.0L gas AND 10.0L gas on same product page (plan on 10.0L) | Up to 6.0L gas |
| Rated diesel engine size | 10.0L diesel AND 8.0L diesel on same product page (plan on 8.0L) | Up to 3.0L diesel |
| Battery capacity (Wh / mAh) | 99.2Wh in user manual; 88.8Wh (24,000mAh at 3.7V) on GOOLOO comparison page; Amazon listing title says 20,000 mAh | 24Wh lithium-ion (mAh not published) |
| Cable gauge | Not published | 8 AWG (on NOCO GBC003 replacement clamp specs page) |
| Cable length | Not published | 12 in (30.5 cm) cable / 23 in (58.4 cm) overall w/ clamps |
| USB-C charging input | 100W Max PD (5V/3A, 9V/3A, 12V/3A, 15V/3A, 20V/5A); ~1.2 hr full charge w/ 100W charger | USB-C 5V 2.1A Max (10.5W); recharge time not published on the GB40 specs page |
| Power outputs | USB-C PD 100W out, USB-A QC 3.0 18W, USB-A 5V/2.4A, 15V/10A DC (150W max) | USB-A 5V 2.1A Max out (no 15V DC port) |
| IP rating | IP65 water-resistant (splash-proof, no immersion) | IP65 (with ports closed) |
| Operating temperature | -4°F to 140°F (-20°C to 60°C) | -4°F to 122°F (-20°C to 50°C) |
| Charging temperature | 14°F to 113°F (-10°C to 45°C) (user manual) | 32°F to 104°F (0°C to 40°C) (data sheet & user guide) |
| Dimensions | 9.05 x 3.93 x 2.12 in (product page) | 6.7 x 3.2 x 1.7 in (manual) / 7.72 x 3.16 x 1.71 in (specs page) |
| Weight | Not published on GT4000S product page or manual | 2.4 lbs (1.08 kg) with clamps and accessories, 1.65 lbs (0.74 kg) bare unit (data sheet); the specs page lists 2.45 lbs (1.11 kg) |
| Safety certification | UL Std. 2743 & RoHS (user manual) | FCC Part 15 Class A (user guide; UL 2743 not published) |
| Warranty | 18 months base (manual); extendable to 30 months (18+6+6 months) | 1-year limited warranty |
| Price band | $$ | $$ |
| Price | Check price | Check price |
Detailed review of both jump starters
Because these two units target different engine sizes and storage constraints, there is no single winner for every garage. Here is how each model stacks up against its own official documentation.
GOOLOO GT4000S Jump Starter
Best for: Trucks, SUVs, and diesels up to 8.0L, 100W USB-C laptop charging, and cold-weather recharging down to 14°F
Choose the GOOLOO GT4000S if you need heavy cranking reserves and high-wattage USB-C charging. On the GOOLOO GT4000S product page, the unit is rated at 4,000A peak current with an IP65 water-resistant housing, a 3.2-inch LED display, a 400-lumen three-mode flashlight, and a 15V/10A (150W max) DC port. In the GOOLOO GT4000S user manual, GOOLOO publishes a 3-second starting current of 800A, an internal capacity of 99.2Wh, UL 2743 compliance, and an 18-month base warranty that can be extended up to 30 months under the GOOLOO warranty policy.
On Keepa, we checked the sales-rank trend, rating history, review count, and seller stability for the GT4000S child listing to verify steady demand in the jump starter category.
Fine print: Two spec conflicts appear across GOOLOO’s own pages. First, the GT4000S product page claims “12.0L gas and 10.0L diesel” near the top of the page, yet states “10.0L gas/8.0L diesel” further down the same page—buyers should plan on the lower 10.0L gas and 8.0L diesel rating. Second, the user manual states 99.2Wh capacity while GOOLOO’s GT4000 vs GT4000S page states 88.8Wh (24,000mAh at 3.7V). In addition, clamp cable length, wire gauge, and unit weight are not published on the product page or manual, and hitting the 1.2-hour recharge time requires either the included 100W car charger or a separately purchased 100W USB-C wall adapter.
What we like
- User manual publishes a sustained 800A (3s) starting current and UL 2743 certification
- Holds 88.8Wh to 99.2Wh of capacity (3.7x to 4.1x the GB40) and supports 100W two-way USB-C PD plus 15V/10A DC output
- Recharges in ambient temperatures down to 14°F (-10°C) and carries an 18-month base warranty (up to 30 months extended)
Watch out for
- Maker sources disagree on engine ceiling (12.0L/10.0L vs 10.0L/8.0L on the product page) and watt-hours (99.2Wh in manual vs 88.8Wh on comparison page)
- Clamp cable length, AWG wire gauge, and unit weight are not published
- Larger 9.05 x 3.93 x 2.12 inch footprint ships with a storage bag rather than a hard case, and no AC wall brick is included
Verdict: Choose the GOOLOO GT4000S if you drive a large V8 truck or a diesel up to 8.0L, want a 100W laptop-capable power bank, or need to recharge your jump starter in a cold garage down to 14°F. Skip it if you want a compact glovebox unit with consistent spec sheets and published 8 AWG clamp dimensions.
NOCO Boost Plus GB40 Jump Starter
Best for: Compact cars, sedans, crossovers, and gas pickups up to 6.0L (or diesels up to 3.0L) where small size and light weight matter most
Choose the NOCO Boost Plus GB40 if you drive a standard gas car or small truck and want a compact unit that fits easily in a glovebox. On the NOCO GB40 product page and NOCO GB40 specs page, NOCO rates the unit at 1,000A peak current with a 24Wh lithium-ion battery for 12V lead-acid gas engines up to 6.0 liters and diesel engines up to 3.0 liters, housed in an IP65 enclosure with the ports closed. NOCO’s data sheet lists a bare weight of 1.65 pounds (0.74 kg) and a total weight of 2.4 pounds (1.08 kg) with clamps and accessories, backed by a 1-year limited warranty.
On Keepa, we checked the sales-rank history, customer rating, review count, and seller stability for the GB40 listing to confirm consistent long-term fulfillment.
Fine print: NOCO lists 1,000A peak current on the GB40 specs page, but sustained cranking amps are not published on the product page, data sheet, or user guide. Its 24Wh battery can only be charged between 32°F and 104°F (0°C to 40°C), and its USB-C input is limited to 5V at 2.1A (10.5W). NOCO’s manual also specifies that the GB40 is strictly for 12V lead-acid batteries, must not be used on frozen batteries or in commercial repair shops, and must be stored indoors when not in use.
What we like
- Compact 6.7 x 3.2 x 1.7 inch manual dimensions and 2.4-pound total weight with clamps fit into standard gloveboxes
- Published 8 AWG wire gauge, 12-inch cable length, and 23-inch overall clamp length on the NOCO GBC003 specs page
- Consistent 6.0L gas and 3.0L diesel ratings across NOCO’s product page, data sheet, and user guide
Watch out for
- Cranking amps are not published, and the 24Wh battery is roughly one-fourth the energy capacity of the GT4000S
- Cannot be recharged below 32°F (0°C), and USB-C charging maxes out at 5V/2.1A with no laptop PD or 15V DC output
- 1-year limited warranty is shorter than GOOLOO’s 18-month base warranty
Verdict: Choose the NOCO Boost Plus GB40 if you drive a 12V lead-acid gas vehicle up to 6.0L (or diesel up to 3.0L) and want a lighter 2.4-pound booster with documented 8 AWG clamps and consistent maker specs. Skip it if you own a larger diesel, need 100W USB-C charging, or need to recharge the pack between 14°F and 32°F.
Why GOOLOO’s own pages disagree on engine size and watt-hours
A close read of the maker documents in GOOLOO GT4000S vs NOCO Boost Plus GB40 exposes two contradictions inside GOOLOO’s own published specs, along with missing figures from both brands that buyers should factor in before ordering:
- GOOLOO’s self-contradictory engine ratings (12.0L/10.0L vs 10.0L/8.0L): On the GOOLOO GT4000S product page, the top summary states that the pack revives 12V gas engines up to 12.0L and diesel engines up to 10.0L. Scroll down the same product page, however, and the description states that the unit works with vehicles up to 10.0L gas and 8.0L diesel. Do not rely on the higher headline claim—plan on the lower 10.0L gas and 8.0L diesel figure so you have a safety margin in cold weather.
- GOOLOO’s 99.2Wh vs 88.8Wh capacity split: The GT4000S product page omits battery watt-hours and starting current. Those figures appear in the Technical Specification table of the user manual (linked from the GOOLOO user guide page), which lists 800A (3s) starting current and 99.2Wh capacity. However, GOOLOO’s GT4000 vs GT4000S comparison page lists the battery capacity as 88.8Wh (24,000mAh at 3.7V). The two GOOLOO sources disagree by 10.4Wh, and the GT4000S Amazon listing title adds a third figure, 20,000 mAh. Either Wh figure still gives you more than triple the watt-hours of the 24Wh NOCO GB40, but treat any single GOOLOO capacity number with caution.
- Missing clamp specs vs missing cranking amps: GOOLOO lists clamp cable length and AWG wire gauge as not published across both its product page and manual. Conversely, NOCO publishes 8 AWG wire size, 12-inch cable length, and 23-inch overall clamp length on its GBC003 clamp specs page, but leaves sustained cranking amps for the GB40 not published.
GOOLOO GT4000S vs NOCO Boost Plus GB40 capacity and charging math
Peak amps only describe a brief surge, while battery watt-hours (Wh) and input wattage tell you how much stored energy is inside the pack and how long it sits on the charger after a roadside jump. You can check the cranking amps your engine requires with our jump starter size calculator and estimate refill times across different adapters using our battery charge time calculator.
Stored energy ratio and USB-C input comparison
Step 1 (Lower GOOLOO capacity figure): 88.8Wh (GT4000S comparison page) ÷ 24Wh (GB40) = 3.70x stored energyStep 2 (Higher GOOLOO capacity figure): 99.2Wh (GT4000S user manual) ÷ 24Wh (GB40) = 4.13x stored energyStep 3 (Max USB-C charging input): GT4000S = 20V × 5A = 100W | GB40 = 5V × 2.1A = 10.5W (9.52x faster input wattage on GT4000S)Example (maker-published recharge time): GT4000S = about 1.2 hours with a 100W PD wall charger (user manual) | GB40 = not published on the GB40 specs pageDespite holding 3.70 to 4.13 times the watt-hour capacity of the GB40, the GT4000S accepts about 9.5 times more USB-C input power, and GOOLOO’s manual quotes about 1.2 hours for a full recharge on a 100W PD wall charger. Sources: GOOLOO User Guide Portal, GOOLOO Comparison Page, NOCO GB40 Specs.
Four manual checks that decide between the GT4000S and GB40
1. Engine displacement (gas and diesel)
Match the jump starter to the largest engine you own. The NOCO Boost Plus GB40 is rated for 12V lead-acid gas engines up to 6.0L and diesel engines up to 3.0L. That covers four-cylinder sedans, V6 midsize SUVs, 5.0L to 5.7L V8 gas pickups, and small 2.0L to 3.0L diesel passenger vehicles. For any gas engine above 6.0L or any diesel above 3.0L, the GB40 is undersized.
Planning on the lower rating printed on the GOOLOO GT4000S product page (10.0L gas and 8.0L diesel rather than the 12.0L gas / 10.0L diesel headline), the GT4000S covers heavy-duty gas V8 trucks and 6.6L, 6.7L, or 7.3L turbo-diesel pickups, supported by its manual-published 800A (3s) starting current.
2. Cold-weather charging limits (14°F vs 32°F)
Both jump starters share a -4°F (-20°C) minimum operating temperature for jump-starting, while the GT4000S is rated for higher heat up to 140°F (60°C) versus 122°F (50°C) for the GB40.
The sharper difference is the minimum charging temperature allowed by each manual:
- GOOLOO GT4000S charging temperature range: 14°F to 113°F (-10°C to 45°C) per Warning #23 in the user manual.
- NOCO Boost Plus GB40 charging temperature range: 32°F to 104°F (0°C to 40°C) per the NOCO GB40 data sheet and user guide.
If you recharge your pack in an unheated garage or via a 12V car port when ambient temperatures sit between 14°F and 32°F, the GOOLOO GT4000S is rated to charge while the NOCO GB40 cannot be charged below freezing. GOOLOO also asks you to let the GT4000S cool for 30 minutes after a jump start before recharging it, while NOCO asks you to rest the GB40 for 15 minutes before attempting another jump start.
3. Warranty length (18 months base vs 1 year)
The NOCO Boost Plus GB40 carries a 1-year limited warranty from the original retail purchase date. The GOOLOO GT4000S user manual includes an 18-month base replacement warranty for manufacturing defects, and GOOLOO’s warranty policy and extended warranty page allow buyers to add 6 months by registering on GOOLOO’s site and another 6 months via social sharing (up to 30 months total).
4. Size, weight, and power bank ports
For compact glovebox storage, the NOCO GB40 has a clear advantage. Its user guide lists dimensions of 6.7 x 3.2 x 1.7 inches (7.72 x 3.16 x 1.71 inches on the GB40 specs page) and a total weight of 2.4 pounds (1.08 kg) with clamps and accessories, or 1.65 pounds (0.74 kg) for the bare booster. The GOOLOO GT4000S measures 9.05 x 3.93 x 2.12 inches, and GOOLOO does not publish the unit’s weight on the product page or in the manual.
In exchange for the larger case, the GT4000S adds a 3.2-inch percentage screen, a 100W two-way USB-C PD port for laptops, an 18W QC 3.0 USB-A port, a 5V/2.4A USB-A port, a Low Current Mode (activated by holding POWER and BOOST for 2 to 3 seconds for sub-200mA devices), and a 15V/10A (150W max) DC output with a cigarette-lighter adapter for tire inflators. The GB40 uses four LED charge indicators, a single 5V/2.1A USB-A output port, and a 100-lumen seven-mode LED flashlight.
When to skip either jump starter
Neither model is a bad pick when matched to the right vehicle, but the official manuals spell out clear boundaries where each unit should be skipped:
| Jump Starter | Choose It If… / Skip It If… |
|---|---|
| GOOLOO GT4000S | Choose it if: You drive a gas vehicle up to 10.0L or a diesel up to 8.0L, want 800A (3s) starting current, need 100W USB-C laptop charging or 15V DC tire-inflator power, want an 18-month base warranty, or recharge between 14°F and 32°F. Skip it if: You want a small glovebox booster with published clamp length, AWG gauge, and weight, or you need -40°F battery pre-heating (which is only on the GT4000, not the GT4000S). |
| NOCO Boost Plus GB40 | Choose it if: You drive a 12V lead-acid gas vehicle up to 6.0L or a diesel up to 3.0L, want a compact 2.4-pound pack that fits in a small glovebox, and want documented 8 AWG clamps. Skip it if: Your engine exceeds 6.0L gas / 3.0L diesel, you need to recharge the pack below 32°F, you want a published cranking amp figure, or you need 100W USB-C PD / 15V DC ports. |
How we chose these picks
For this GOOLOO GT4000S vs NOCO Boost Plus GB40 comparison, we did not lab-test physical units; we checked Keepa sales history, official maker product pages, technical data sheets, and owner’s manuals to verify every specification.
Sources: GOOLOO GT4000S Product Page, GOOLOO User Manuals, NOCO GB40 Specs, NOCO Downloads
Bottom line: Your engine displacement, winter charging temperature, and storage space decide the outcome in GOOLOO GT4000S vs NOCO Boost Plus GB40. When comparing GOOLOO GT4000S vs NOCO Boost Plus GB40, choose the GOOLOO GT4000S (planning around its lower 10.0L gas and 8.0L diesel rating) if you need 800A of 3-second starting current, 99.2Wh / 88.8Wh of capacity, 100W USB-C fast charging, an 18-month base warranty, and cold charging down to 14°F; choose the NOCO Boost Plus GB40 if you drive a 12V lead-acid gas car or light truck up to 6.0L (or diesel up to 3.0L) and want a compact 2.4-pound glovebox booster with 8 AWG clamps.
Frequently asked questions
What engine size is the GOOLOO GT4000S rated for compared to the NOCO GB40?
What are the cranking amps and battery watt-hours of the GOOLOO GT4000S vs NOCO GB40?
Which jump starter can be charged in colder weather, the GT4000S or the GB40?
Does the GOOLOO GT4000S include the -40°F pre-heating feature?
What are the cable length and wire gauge on the GOOLOO GT4000S and NOCO GB40?
How does the warranty compare between the GOOLOO GT4000S and NOCO Boost Plus GB40?
Researched by Shahzad
Amazon seller who researches products using sales-rank history, price tracking and owner reviews before recommending anything. Read our disclosure.