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NOCO GB40 Boost+ 1000-amp jump starter and portable power bank

Item # 598GB40

The GB40 power pack is designed to solve life's little charging problems.

The GB40 power pack is designed to solve life's little charging problems.

California customers:
Please click here for your Proposition 65 warning.

11 questions - 32 answers

Item # 598GB40

In stock

About the NOCO GB40 Boost+

Bob Bihlmayer

Dead battery blues

At some point, your vehicle will need a jump start. And if you use portable electronic devices, eventually you'll need to power them when an outlet's not available. NOCO designed their GB40 power pack to solve life's little charging problems. The GB40 portable lithium-ion power pack delivers 1000 amps to jump start your vehicle's battery, and it also features a microUSB port which allows you to charge the GB40 from any USB-powered port like a wall charger, car charger, or laptop.

Dead battery blues

At some point, your vehicle will need a jump start. And if you use portable electronic devices, eventually you'll need to power them when an outlet's not available. NOCO designed their GB40 power pack to solve life's little charging problems. The GB40 portable lithium-ion power pack delivers 1000 amps to jump start your vehicle's battery, and it also features a microUSB port which allows you to charge the GB40 from any USB-powered port like a wall charger, car charger, or laptop.

Start your car up to 20 times

The GB40 can start a typical vehicle up to 20 times on one charge. The pack's battery holds its charge level for over a year, and it's rated for over 1000 charge cycles. The GB40 is suitable for jump starting cars, boats, RVs, trucks, and other vehicles with gas engines up to 6 liters and diesel engines up to 3 liters. Its patented safety protection ensures spark-proof connections and reverse polarity protection.  

LED flashlight

As well as charging, the GB40 also includes a built-in LED flashlight with seven modes, including SOS and emergency strobe. Its 100-lumen output will help you see at night, and also serves as a warning light when your vehicle is disabled and needs roadside assistance. 

This versatile device is made to meet all your 12-volt needs. Whether your problem is a car that won't start or a dark corner of your vehicle, this NOCO will give you the juice you need.


Product highlights:

  • portable jump starter and power bank
  • lithium-ion battery
  • USB inputs and outputs
  • 1000A jump-start current
  • starts gas engines up to 6 liters and diesel engines up to 3 liters
  • 100-lumen dual LED flashlight
  • dimensions: 7-3/4"L x 3-1/4"W x 1-3/4"D
  • warranty: 1 year
  • MFR # GB40

What's in the box:

  • Lithium jump starter
  • Battery clamps
  • 12V/USB car charger
  • 3' microUSB-to-USB cable
  • Storage pouch
  • User Guide
  • Warranty Information

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More details on the NOCO GB40 Boost+

Russ B.

Product Research


UltraSafe Lithium Jump Starter: The Noco Boost Plus GB40 is a portable lithium-ion battery jump starter pack that delivers 1,000-amps (7,000 J3S) for jump starting a dead battery in seconds. The Boost Plus GB40 powerful lithium jump starter is capable of jump starting up to 20 vehicles on a single charge. It's rated for over 1,000 charge cycles and holds its charge level for over a year with minimal power loss. Its designed for a car, boat, RV, truck and more with gas engines up to 6 liters, and diesel engines up to 3 liters.

  • 12V Lead-Acid Battery Compatible: The GB40 is designed to jump start 12-volt lead-acid batteries down to 2-volts. If your battery is below 2-volts, the Boost LED will be "Off". This is an indication that the GB40 can not detect a battery. If you need to jump start a battery below 2-volts there is a Manual Override feature, which allows you to force "On" the jump start function.
  • Spark-Proof Connection & Reverse Polarity Protection: It features a patented safety technology that provides spark-proof connections and reverse polarity protection making it safe and easy for anyone to use.

Note: Most vehicles will immediately start. Some vehicles may require the GB40 to be connected for up to 30 seconds before starting. If the vehicle does not start right away, wait 20-30 seconds and try again. Do not attempt more 5 consecutive jump starts within a 15 minute period. Allow the GB40 to rest for 15 minutes before attempting to jump start the vehicle again.

Simple User Interface: Noco designed the GB40's user interface to be simple and easy to understand. LED status indicators display the internal lithium battery's charge level and charging status. Error indicators show when connected in reverse polarity or temporarily disabled for thermal protection. Or simply turn on the LED flashlight, recharge a USB device, or use manual override for deeply discharged batteries.

Heavy-Duty Battery Clamps: The included heavy-duty battery clamps span 23" in length, and capable of reaching most battery posts or chassis ground. It features a high-temperature silicone wire insulation that remains extremely flexible down to 0°F and withstands high levels of duress and even prolonged exposure to high temperatures.

100-Lumen Dual LED Flashlight: The GB40 feature's a built-in rechargeable, lithium-powered LED flashlight with seven light modes - 100%, 50%, 10%, SOS, Blink, Strobe, & Off. With multiple luminosity settings, it's immediately adaptable to a variety of situations. Use it's powerful flashlight will help you see your engine, changing a tire at night or even warn oncoming traffic when disabled and needing of roadside assistance.

Built-in 2.1A USB Output: The built-in 5V/2.1A USB out port can power and charge your USB devices - such as smartphones, GoPro cameras, wireless headphones, and more. Devices that are frequently being used, like phones and cameras, often require more power to run all day than the device's battery is rated for. The GB40's battery pack extends the life and running time of your device. Plus, powering your device from an external battery pack will reduce the internal battery's charge cycles, extending the usable life.

microUSB Charging Input: Recharge the GB40 using its microUSB input, the included microUSB-to-USB cable, the supplied 12V car charger, and your vehicle's 12V power port or cigarette lighter adapter port. It can also be recharged from any USB powered port - like an AC adapter, computer/laptop, and more. The microUSB Input is rated at 5V/2.1A to ensure safe and efficient charging of the internal lithium battery. The time to recharge the GB40 will differ based on the discharge level and the power source used (actual results may vary due to battery conditions).

USB Charger Rating 0.5A 1A 2A
Charging Time 12 hours 6 hours 3 hours


  • The GB40 comes partially charged out of the box and needs to be fully charged prior to use.
  • Due to FCC regulations, we recommend not to charge and discharge the unit at the same time.

Charge LEDs: The GB40 has four Charge LEDs - 25%, 50%, 75% and 100%. These Charge LEDs indicate the internal battery's state-of-charge (SOC).

  • The 25% Charge LED will pulse while charging and will be solid Red when the internal battery is 25% charged.
  • The 50% Charge LED will pulse while charging and will be solid Red when the internal battery is 50% charged.
  • The 75% Charge LED will pulse while charging and will be solid Yellow when the internal battery is 75% charged.
  • The 100% Charge LED will pulse while charging and will be solid Green when the internal battery is fully charged.

Rugged Compact Design: This compact, pocket-sized lithium jump starter is IP65 rated (with ports closed) to protect it against water, shock, dirt, and dust. It's 8X smaller and lighter than traditional battery booster packs and conveniently stores in a glove compartment, center console, trunk, or toolbox.

Protection Circuitry: The GB40 will display an Error Condition when a reverse polarity condition is present, a battery below 2 volts, or the internal battery overheating. The Error LED will be solid Red when polarity is reversed or will blink Red when the internal battery is too hot. The Boost Light will not come on if the connected battery is below 2 volts.

Auto Shut Off: The GB40 has a built in energy saving feature that will automatically turn the unit off after 7 hours. To continue using, simply power on the unit again.

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Customer Q&A

11 questions already asked

How many cold cranking amps does this have?
ray  Dec 29, 2022
1 answer
Greetings Ray, and thank you for your question. There is no CCA listed for the GB40 booster, but its just a booster for the times your battery does not have enough energy to start your vehicle. You might get CCA information from the manufacture, but if its not listed anywhere, you might not. I have this GB40 myself, and have jumped 7 times on a single charge. Temperature matters as well as colder vehicles use more energy to turn the motor over.
hogan  Dec 29, 2022 (Staff)
Hooked up to my boat battery and it's saying reverse polarity. It's hooked up correctly. Could the battery be too low to jump?
steve  Aug 20, 2022
1 answer
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer.
zachary  Aug 20, 2022 (Staff)
Can you store it inside your car without any problems? The owner's manual says not to store in temps over 122 and never over 178 or around there. What's the point in having a jump starter if you can't keep it in the car?
brian  Jul 11, 2022
1 answer
Greetings Brian, and thank you for your question. The operating and storage temperature is at 122 degrees. The warning is to let one know operating this under any conditions above 122 degrees may result in injury, or damage to the unit itself. I personally own the same GB40, and have kept it in my car since day one in summer and winter. It gets above 122 degrees in my vehicle in the summer months, and have had no issues to this point and its been over a year now. Like a battery, this will lose energy faster at higher temperatures.
hogan  Jul 11, 2022 (Staff)
Will it still charge a car if it's under 32 degrees ?
rosalie  Feb 12, 2021
2 answers
I started my Subaru Forester yesterday when the car temperature was 29 F. The car started immediately. Without the NOCO booster, the car battery could not quite turn over the engine. The NOCO booster was also at 29F. I have not tested it < 29 F.
linus  Feb 21, 2021
I charged a car when the temp was around 24 degrees & the Noco GB40 was in my trunk ice cold & it charged the car with no problem.
vincent  Feb 12, 2021
How long does it take to charge boost box before charging?
tootie  Feb 10, 2021
2 answers
This is NOT a charger, it???s a jump starter. It only took a few hours to get mine fully charged, but it had sufficient charge on arrival to have helped start a car.
paul  Feb 10, 2021
when i first got my Noco boost i think i charged it for six hours.
mart  Feb 10, 2021
How easy. tell me the steps to hook it up to my wife's car battery?
juicey rich  Jan 21, 2021
3 answers
It doesn't work. My wife's car had a dead battery, and I followed the instructions carefully. The unit was fully charged, but my wife's car still wouldn't start. A fellow from the auto dealership showed up with a different brand, and my wife's car started right away.
theodore  Jan 21, 2021
Red cable to positive + and black to the other polo on switch and done
alex  Jan 21, 2021
Easy, just follow the simple instructions given in the manual enclosed with the unit, which it's only different in the connection process. Positive with positive, negative with negative, push the on button and wait for the bars to light up completely. Start the car. Hope this helps you start your wife's car.JADF
jose a  Jan 21, 2021
It says this unit can power 12v devices such as a tire pump, but don't see any 12v "out" port?
m  Oct 01, 2020
1 answer
Has 2 types of USB ports and connection to jump start a battery. Charge last long time even in Texas summer
chase  Oct 04, 2020
where is this product made?
sergio  Apr 05, 2020
8 answers
NOCO GB40 website says USA. You can verify this as I did (on their website). Thanks
jack j  May 20, 2020
Correcting my response from yesterday. Just pulled mine out of the vehicle, it's made in China. Sorry for the previous misinformation.
thomas l  May 20, 2020
Designed in USA but unfortunately it is made in China, but it is a great product.
bobby  May 20, 2020
Sad to say but China
chase  May 19, 2020
Their headquarters, design, and engineering are in the US but manufactured in multiple countries. Mine specifically was made in China. I love these, I???ve had five of these types of devices and these are the only ones that have worked well for me. I was most impressed by it starting a 4.7l v8 where the battery was completely dead, dash lights weren???t even coming on. I will say I???d get the gb50 if money is not an issue.
benjamin  May 19, 2020
Multiple countries of origin
robert  May 19, 2020
I'm pretty certain they are US made. Suggest you Google the company website and message them to confirm. It's a great product.
thomas l  May 19, 2020
darren  May 19, 2020
Will this start a marine battery that has 1000 cranking amps?
steve  Mar 06, 2020
1 answer
It???s rated for 1000 amps and will start Gas engines up to 6 litres, and Diesel engines up to 3 litres
ronald  Mar 08, 2020
how often do I have to charge my unit?
jesse  Oct 25, 2019
10 answers
Not very often. Depending on use. I like to TOP OFF mine every three months or so. With NO USE.
arno a.  Oct 26, 2019
In my experience, very rarely. I've had mine two years and I think I've charged it twice in that time, with one actual use for jump-starting and otherwise just sitting in the car toolbag. If it isn't used it will hold its charge for a very long time. I'd say check it periodically and you'll probably find that it will only need charging after being used a few times or after a long period of storage.
david  Oct 26, 2019
I haven???t needed to charge it very often, maybe once every 3-4 months, especially if I have used it. Fortunately, I have not needed it often, but when I have, it???s always come through. If it hasn???t been used, I have noticed that after about 4 months it still has at least 80-90% charge left in the lithium ion battery, which is plenty for several jump starts. So far, very happy with the unit.
dale  Oct 26, 2019
After using this unit a few times, I fully charged it and have not used the unit for over three months. I just checked the unit today and it is still fully charged.
ben  Oct 26, 2019
Not a lot. I have used mine about 5 times and fully charged it twice.
migdalia  Oct 26, 2019
You should charge it every time you use it. In this way, it always has full charge. Even though you do not use it, it keeps the charge for a long perid of time.
ada de  Oct 26, 2019
I only charge my unit after I use it,or if it's showed its low on the indicator ,
bret  Oct 26, 2019
I gave this to my son as a gift. I was at his home a few months later when his neighbor needed a boost but car was parked where his cables wouldn't reach. My son pulled this "Genius" out of his truck (he had never needed to use it after the initial charge) and used it to start his neighbor's car. So, every few months should be sufficient to re-charge it, depending on either really cold or hot weather. I would certainly err on the side of making sure it's charged before going to the wilderness or taking a road trip. Hope this helps.
robert  Oct 26, 2019
I charged my unit only two times since December 2017, amazing product , very handy and easy to used.
eric  Oct 26, 2019
Charge it before it gets to 25 percent
robert  Oct 25, 2019
is a 117 volt cable available for charging gb40 boost .unit [house current to gb40 ?
jo  Aug 10, 2017
2 answers
everything needed was included on delivery
daniel  Aug 11, 2017
Well the cable included is an usb terminal but you can charged using iphone charger adapter or similar connected to any household electrical terminal then connect the usb terminal similar as you charge mobile phones.
david  Aug 11, 2017

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