NOCO Boost Plus GB40 Review: Specs and How to Use It

Update: The NOCO Boost Plus GB40 remains one of the most compact 1000A jump starters you can buy, at 2.4 lb and $99.95 list on NOCO’s site. I’ve added NOCO’s full spec table, a step-by-step jump starting guide, how it compares with the bigger GB50 and GB70, and worked examples for charging and phone top-ups.

A dead battery always seems to happen at the worst time. A portable jump starter means you don’t have to wait for another car or call for help, as long as you actually keep one in your vehicle.

For this review, I checked out the NOCO Boost Plus GB40 1000A Jump Starter. I looked at its compact size, connected the jumper clamps, tested the built-in flashlight modes, and used the USB charging feature to power smaller devices. This one wasn’t sent to me by NOCO.

In this NOCO Boost Plus GB40 review, I’ll cover the specs, what I tested, the safety features, the pros and cons, and who it’s for.

Products Used in My NOCO GB40 Video

👉 NOCO Boost Plus GB40 1000A Jump Starter

For business inquiries and collaborations: luisangel@ryzzun.com

Affiliate Disclosure: If you purchase an item through the links provided, I may receive a commission from the Amazon Influencer Program, at no additional cost to you. Thank you for supporting the channel.

What Is the NOCO Boost Plus GB40?

The NOCO Boost Plus GB40 is a 12V, 1000-amp portable lithium jump starter. NOCO rates it for engines up to 6.0L gas and 3.0L diesel, with up to 20 starts per charge. It weighs about 2.4 pounds, so it fits in a glove box or emergency kit.

Key Specs and Features

• 1000A peak current
• Starts gas engines up to 6.0L and diesel engines up to 3.0L
• Up to 20 starts per charge, per NOCO
• Spark-proof and reverse polarity protection (UltraSafe)
• Built-in USB power bank
• 100-lumen LED flashlight with 7 modes, including SOS and strobe
• IP65 water and dust resistance
• Heavy-duty jumper clamps
• Recharges in about 3 hours, per NOCO
• About 2.4 lbs
• 1-year limited warranty

NOCO Boost Plus GB40 Specs at a Glance

Spec	NOCO Boost Plus GB40
Peak current	1,000A
Voltage	12V
Engine rating	Up to 6.0L gas, up to 3.0L diesel
Starts per charge	Up to 20
Phone recharges	Up to 4 smartphone recharges
Recharge	About 3 hours from a 2.1A USB port
Flashlight	100 lumens, 7 modes incl. SOS and strobe
Protection	Spark-proof, reverse polarity protection
Enclosure	IP65 water resistant
Operating temperature	-4°F to 122°F (-20°C to 50°C)
Weight	2.4 lb
List price	$99.95 at no.co (Oct 2026)

What I Tested

Compact Size

What stands out most is how compact the GB40 is compared to traditional jump starter setups. It stores easily in a glove box or trunk while still offering enough power for emergencies.

The Clamps

I connected the jumper clamps to show how they attach. NOCO’s spark-proof and reverse polarity protection is designed to prevent sparks and wrong connections, which is reassuring if you don’t jump cars often.

Flashlight Modes

I tested the built-in flashlight modes. Having a light, plus SOS and strobe, is useful at night on the side of the road or when you’re working under the hood.

USB Charging

I also used the USB charging feature to power smaller devices. That makes the GB40 useful beyond jump starting, like keeping your phone alive in an emergency.

How to Jump Start a Car With the NOCO GB40

NOCO designed the GB40 to be mistake-proof, but the order still matters. Here’s the basic sequence from NOCO’s guide:

Screenshots in this post are from my YouTube video.

1. Turn off the ignition, lights and accessories.
2. Connect the red (positive) clamp to the positive battery terminal.
3. Connect the black (negative) clamp to the negative terminal or a solid, unpainted metal ground on the engine or frame.
4. Press the power button. The Boost LED shows the GB40 is ready.
5. Start the vehicle. If it doesn’t start, give the GB40 a short rest before the next attempt.
6. Once the engine runs, disconnect the black clamp first, then the red clamp.
7. Recharge the GB40 once you’re home so it’s ready next time.

Very low batteries: if the vehicle’s battery is below about 2V, the GB40 may not detect it. NOCO’s Manual Override handles this: hold the button for 3 seconds until the Boost LED flashes. Override bypasses the safety protection, so double-check the clamps before you use it.

NOCO Boost Plus GB40 Pros and Cons

Pros

• 1000A in a compact, 2.4 lb package
• Spark-proof and reverse polarity protection
• Flashlight with SOS and strobe modes
• USB power bank for phones and small devices
• IP65 water and dust resistance
• Fits in a glove box

Cons

• Rated for engines up to 6.0L gas and 3.0L diesel, so bigger engines need a larger model
• No built-in air compressor
• 1-year warranty

Is 1000A Enough for My Engine?

NOCO rates its packs by engine size, which is the number to check. Here’s how the GB40 compares with its bigger siblings:

Model	Peak amps	Gas engines	Diesel engines
GB40 Boost Plus	1,000A	Up to 6.0L	Up to 3.0L
GB50 Boost XL	1,500A	Up to 7.0L	Up to 4.5L
GB70 Boost HD	2,000A	Up to 8.0L	Up to 6.0L

Worked example: a Honda Civic (2.0L), a Toyota RAV4 (2.5L) and a V6 Ford F-150 (3.5L) all sit well inside the GB40’s 6.0L gas rating. A 6.2L V8 truck or a 6.7L diesel pickup is GB70 territory. Cold weather makes engines harder to crank, so if you’re near the top of the range and live somewhere cold, the next size up gives extra margin.

Worked Example: Phone Charging and Recharge Time

Task	NOCO rating	What it means
Jump starts	Up to 20 per charge	Plenty for a season of emergencies
Phone recharges	Up to 4	A long day of navigation and calls after a breakdown
Recharging the GB40	About 3 hours at 2.1A	Plug it into a USB wall charger overnight

A simple habit keeps it ready: check the charge level when you change the clocks in spring and fall, and top it up after any use. If you also want an air compressor in the same pack, my AUXBEAM 3500A review covers that style, and the S ZEVZO H021 review covers a higher-amp option.

Who Is It For?

I think the NOCO Boost Plus GB40 is a great fit for:

• Daily drivers with cars, small SUVs, and small trucks
• Motorcycle, ATV, and boat owners
• New drivers who want a foolproof jump starter
• Anyone building a vehicle emergency kit

Looking at other car tools on this site? See my AUXBEAM 3500A Jump Starter review if you want a pack with a built-in air compressor, or my S ZEVZO H021 Jump Starter review for a higher-amp option.

Building a Glove Box Emergency Kit Around the GB40

The GB40’s small size makes it the center of a compact car kit. Pair it with a tire gauge, a pair of gloves, a reflective triangle, and a USB cable for your phone. Because the GB40 has its own 100-lumen light with SOS and strobe, you can skip a separate flashlight. NOCO’s operating range of -4°F to 122°F covers most climates, so it can live in the car year-round.

Frequently Asked Questions

What engines can the NOCO GB40 start?

NOCO rates it for gas engines up to 6.0L and diesel engines up to 3.0L.

Is the NOCO GB40 safe to use?

It has spark-proof and reverse polarity protection to help prevent mistakes.

Can it charge my phone?

Yes. It has a built-in USB power bank.

Is it waterproof?

It has an IP65 rating for water and dust resistance.

Is the NOCO GB40 worth it?

Yes if you want a compact, glove-box-friendly jump starter with spark-proof clamps, a flashlight, and a USB power bank. Skip it if you need a built-in air compressor or more than a 6.0L gas / 3.0L diesel rating.

How many amps is the NOCO Boost?

The NOCO Boost Plus GB40 is rated at 1000A peak current. The Amazon listing calls it the NOCO Boost GB40 12V 1000A UltraSafe Portable Lithium Jump Starter.

Are NOCO jump starters any good?

Based on what I checked for this unit: it is compact, safe to use with UltraSafe spark-proof and reverse polarity protection, and useful beyond a dead battery thanks to the flashlight and USB charging.

How long does the NOCO GB40 take to charge?

About 3 hours from a 2.1A USB port, per NOCO.

What is NOCO Manual Override?

A mode for batteries below about 2V that the GB40 can’t detect. Hold the button for 3 seconds until the Boost LED flashes. It bypasses the safety protection.

How much does the NOCO GB40 weigh?

2.4 lb.

What’s the difference between the GB40 and GB70?

The GB70 is rated 2,000A and up to 8.0L gas and 6.0L diesel engines. The GB40 is 1,000A for up to 6.0L gas and 3.0L diesel.

Is the NOCO Boost Plus GB40 Any Good?

Yes. In this NOCO GB40 review, the NOCO Boost GB40 jump starter is a solid everyday pick: about 2.4 pounds, fits in a glove box, and delivers 1000 amp peak power for engines up to 6.0L gas and 3.0L diesel. I checked the clamps, flashlight modes, and USB charging, and the UltraSafe spark-proof and reverse polarity protection is reassuring if you do not jump cars often. The trade-offs are the engine-size limit, no built-in air compressor, and a 1-year warranty.

Final Verdict

The NOCO Boost Plus GB40 1000A Jump Starter is one of those emergency tools that’s easy to keep in your vehicle without taking up space. It’s compact, safe to use, and the flashlight and USB charging make it useful beyond a dead battery.

Watch My NOCO GB40 Review

In my video, I walk through the NOCO Boost Plus GB40, including the clamps, flashlight, and USB charging. You can watch the full video on my YouTube channel, Ryzzun Reviews:

▶ NOCO Boost Plus GB40 Jump Starter Review (1000A Portable Starter)

👉 NOCO Boost Plus GB40 1000A Jump Starter

For business inquiries and collaborations: luisangel@ryzzun.com

If you purchase an item through the links provided, I may receive a commission from the Amazon Influencer Program. Thank you for supporting the channel.

Sources: NOCO GB40, GB50 and GB70 product and support pages (accessed Oct 2026).