Is it worth the price over cheaper alternatives?

For frequent drivers who value a compact, well-built unit with proven reliability, the GB40's combination of build quality, safety features, and portability justifies the price; budget buyers who need far higher capacity or extra features may prefer larger, feature-rich rivals.

How many jump starts can I expect per charge?

Expect roughly one to two jump starts per full charge in typical conditions; reviewers and lab tests consistently report limited usable Wh (around ~15–16 Wh usable) compared with larger packs.

What size engines will it start?

NOCO rates the GB40 for up to about 6.0L gasoline and 3.0L diesel engines; reviewers confirm reliable starts for most 4- and 6-cylinder cars but note it can struggle with the largest V8s and heavy diesel engines.

Can I use it in cold weather?

Yes for routine emergency use near freezing — reviewers achieved cold starts around ~32°F — but expect reduced capacity in deep-freeze; for sustained cold or repeated cold-weather jumps consider a higher-capacity or more climate-hardened model.

What charging accessories are included?

The GB40 ships with a micro-USB charging cable and a thin nylon pouch; it does not include a wall AC or 12V car charger, so those must be sourced separately if desired.

How should I maintain it while stored?

Top off the charge every 3–6 months, store at moderate room temperature away from direct sun/heat, and keep clamps dry and free of corrosion to preserve long-term battery health.

What's included in the box?

Included are the GB40 unit with attached boost cable assembly (approx. 23" boost cables, 8 AWG), a micro-USB charging cable, and a thin carry pouch; no AC or 12V charger is included.

Our Pick

NOCO Boost Plus GB40 UltraSafe Lithium Jump Starter

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NOCO

NOCO Boost Plus GB40 UltraSafe Lithium Jump Starter

Name: NOCO Boost Plus GB40 UltraSafe Lithium Jump Starter
Brand: NOCO
SKU: 1782436036219x421768864933333
Price: 75.96 USD
Availability: InStock
Rating: 3.9 (3 reviews)

AI-RESEARCHED INSIGHTS

Quick Verdict

Great For

Glovebox-sized emergency jump-starter for small-to-medium gasoline and diesel vehicles, roadside backup for everyday drivers, car-camping and short road trips where portability matters

Not Ideal For

Heavy-duty fleet or professional use, very large V8/diesel trucks, repeated multi-jump scenarios without recharging, extreme deep-freeze conditions

Ultra-compact, lightweight, and highly portable — easy to store in a glovebox or under a seat

Limited battery capacity — typically only one to two jumps per full charge

$75.96

Frequent promotions on major sale days (Prime Day, Black Friday, Memorial Day) where it can drop ~30-40% to ~$60–80

Community Rating:

Key Specifications

Model Update

Weight

2.4 lbs(38 oz)

Packed Size

6.4 x 2.3 x 9.4 inches (approx.)

Materials

Hard polymer (plastic) shell with rubberized end caps; heavy-gauge steel clamps with molded insulated handles

About This Gear

The most thoroughly tested compact jump starter in its class — top pick at TechGearLab, CNN Underscored, and one of three finalists in a 19-unit head-to-head comparison. It reliably starts gas engines up to 6.0L (and diesel to 3.0L), with verified cold-weather performance including three consecutive starts of a drained 4.0L V6 at 33°F. Glovebox-sized insurance for group car-camping trips; recharge it every six months in storage to keep the pack healthy — a self-discharged lithium cell is the primary failure mode. For the largest V8s in deep cold, the GB50 or GB1000 provides additional cranking margin.

Pros & Cons

Synthesized from expert reviews and user feedback

What People Love

4 positive findings

Ultra-compact, lightweight, and highly portable — easy to store in a glovebox or under a seat
Everyone agrees
Rugged build quality with heavy-gauge clamps and solid polymer housing
Most reviewers
Reliable starting power for small-to-mid-size engines (rated to ~6.0L gas / 3.0L diesel)
Most reviewers
Built-in safety features (spark-proof clamps, reverse-polarity protection) and extra utility (USB power output, LED flashlight)
Most reviewers

Things to Consider

5 considerations

Limited battery capacity — typically only one to two jumps per full charge
Most reviewers
Short, stiff clamps and relatively short leads that can be hard to squeeze or awkward with gloves
Most reviewers
No bundled AC or 12V charger and only a thin carry pouch included
Most reviewers
Slow charging via micro-USB and limited power-bank capability (single USB-A port)
Most reviewers

Weather & Conditions

How this gear performs across different environments and seasons

Best Seasons3 season gear

springsummerfall

Temperature Range

0°FMin rated

32°F - 95°FOptimal comfort

120°FMax rated

Performs best in moderate ambient temperatures; Li-ion capacity and charging are diminished in deep cold and high heat (avoid charging below 32°F and prolonged exposure above ~104–105°F)

Weather Performance

Rain

Humidity

Wind

Snow

Heat

Climate Suitability

Desert / AridModerate

Alpine / MountainModerate

CoastalExcellent

Humid SubtropicalGood

TemperateExcellent

Excels In

mild rain and splash-prone roadside use
moderate temperatures and temperate climates
coastal and dusty conditions where IP65 dust protection helps

Limitations

not recommended as a primary solution for prolonged winter camping or professional cold-weather use
battery performance and number of jumps per charge decline in extreme cold or heat

What People Are Saying

Aggregated insights from expert reviews and user feedback

Community Consensus

Users overwhelmingly praise the GB40 for its compact size, build quality, and dependable starts for small-to-medium vehicles; common complaints focus on limited battery capacity, short/stiff clamps, and the lack of a bundled charger or robust case.

What Users Love

easy setup
durable build
compact and lightweight
reliable starts for small/medium engines

Common Concerns

limited jumps per charge
short/stiff clamps
slow micro-USB charging and limited ports

Durability Notes

many users report years of trouble-free service; a minority report eventual battery degradation or swelling after multi-year use

Warranty & Support

Manufacturer lists a 1-year limited warranty; most users report adequate warranty support but some return-to-retailer cases are noted

Expert Reviews

TechGearLabBest Compact Model

3.2/5

This rugged, compact model delivers solid, trustworthy performance... great for small-to-medium cars and pickups

Read full review →

Car and DriverMost Compact (2026 Best Portable Jump Starters)

4/5

The Noco GB40 is the smallest jump starter in our test with decent power and an easy interface; we wouldn't recommend banking on more than one or two jumps per charge

Read full review →

The DriveBest Overall (2025)

4.5/5

Reliable, consistent — not soon to let you down; heavy-duty cables and reverse-polarity protection stand out

Read full review →

Care & Maintenance

Keep your gear performing at its best with these tips

Maintenance Tips

Keep it in top condition

store dry and at moderate temperatures
top off charge every 3–6 months
dry and inspect clamps after wet use and clean corrosion if present
replace charging cable or use recommended USB-C wall adapter for faster charging where applicable

Watch Out For

Known issues to monitor

battery self-discharge if left uncharged
long-term capacity fade and occasional reports of battery swelling after years

No known recalls or safety issues

Alternatives to Consider

Compare with similar products that might better fit your needs

AstroAI

AstroAI S8 Ultra

Key Differences

much higher peak output (~4,000A)
heavier and larger
includes multiple USB/USB-C ports and often additional features like air compressor

Consider this when

when you need much higher cranking power and extra ports/features on a budget

NOCO

NOCO GB50

Key Differences

higher cranking capacity (~1,500A)
greater weight and price
often includes 12V charging options on higher models

Consider this when

when you want a similar, slightly higher-capacity NOCO model for bigger engines/more jumps

These alternatives were identified based on similar features, use cases, and price range to NOCO Boost Plus GB40 UltraSafe Lithium Jump Starter.

Frequently Asked Questions

Common questions about this gear

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Last updated June 25, 2026

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