NOCO Boost GB40 1000A Lithium Jump Starter
A pocket-size lithium jump starter for 12-volt cars with gas engines up to 6.0 liters and diesels up to 3.0 liters, with spark-proof clamps, a USB power bank and a flashlight.
Quick verdict
- Best for:
- Starting a car with a flat battery, alone.
- Watch out:
- Too small for big diesels.
Amazon US listing and availability checked October 26, 2026. Prices and stock can change.
Reviewed October 17, 2026 · How we review
Part of our buying guide: Choosing a Portable Jump Starter: Engine Size, Safety Features and Upkeep
Our Take
A jump starter lets you start a car with a flat battery on your own, without a second car or jumper cables. NOCO rates the GB40 at 1,000 amps peak for 12-volt lead-acid batteries, gas engines up to 6.0 liters and diesel engines up to 3.0 liters, with up to 20 jump starts per charge. The clamps are spark-proof and protected against reverse polarity, so connecting them the wrong way round doesn't cause a spark. NOCO lists a 24 Wh lithium battery, a USB port that charges a phone, a 100-lumen flashlight with seven modes including SOS, an IP65 rating against dust and water, 2.45 lb, and a one-year warranty. It recharges over USB-C in about three hours at 2.1 amps. The limit is engine size: a big V8 truck or a larger diesel needs NOCO's bigger GB50 or GB70. And it starts a car; it doesn't fix a battery that keeps going flat. We haven't tested it ourselves.
Specs (This Configuration)
- Peak current
- 1,000 A, 12 V lead-acid (NOCO)
- Engines
- Gas up to 6.0 L, diesel up to 3.0 L (NOCO)
- Battery
- 24 Wh lithium-ion; up to 20 starts per charge (NOCO)
- Charging
- USB-C in, USB out, 5 V 2.1 A (NOCO)
- Size and weight
- 7.72 × 3.16 × 1.71 in, 2.45 lb; IP65 (NOCO)
- Warranty
- 1 year (NOCO)
Best For
- Cars and small SUVs with gas engines up to 6.0 L
- Keeping in the glovebox for a flat battery
- Drivers who don't want to rely on a second car
Skip If
- You drive a big diesel or a large V8 truck
- Your battery keeps going flat and needs replacing
- You need to start 24-volt equipment
What We Like
- Spark-proof clamps with reverse polarity protection
- Small enough for a glovebox
- Doubles as a phone power bank and flashlight
What To Know
- Rated for gas engines up to 6.0 L and diesels up to 3.0 L
- Recharge it every few months so it's ready when you need it
- Our photo shows a unit photographed in 2017; NOCO's current spec sheet lists a USB-C input
Pros
- Sold by Amazon.com on the listing we checked
- Up to 20 jump starts per charge (NOCO)
- Dust- and water-resistant IP65 housing
Cons
- Too small for big diesel engines
- One-year warranty
- Doesn't charge or test the car battery
Alternatives
- NOCO Boost GB50 (1500A) — The next size up: NOCO rates it for gas engines up to 7.0 L and diesels up to 4.5 L.View on Amazon
- NOCO Boost GB70 (2000A) — For big engines: NOCO rates it for gas up to 8.0 L and diesel up to 6.0 L.View on Amazon
- NOCO GENIUS5 battery charger — For a battery that keeps going flat: it charges and maintains the battery instead of jump-starting it.
Why PriceDropIQ Selected It
A dead battery on a cold morning is the most common reason a car won't start, and a jump starter in the glovebox gets you going without waiting for help or a second car. The GB40 covers most cars and small SUVs, and its clamps won't spark if you connect them the wrong way round. For a big diesel or a V8 truck, choose the GB50 or GB70.
Before You Buy
- Check your engine: gas up to 6.0 L, diesel up to 3.0 L
- Check that the seller is Amazon.com
- Charge it fully when it arrives and top it up every few months
Frequently Asked Questions
Will it start my truck?
NOCO rates the GB40 for gas engines up to 6.0 liters and diesel engines up to 3.0 liters. For larger engines, NOCO sells the GB50 and GB70.
Is it safe if I connect the clamps the wrong way?
NOCO says the GB40 is spark-proof and has reverse polarity protection, so it won't send power if the clamps are reversed.
Can it charge my phone?
Yes. NOCO lists a USB output of 5 volts and 2.1 amps, and the GB40 recharges over USB-C in about three hours.
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Reviewed October 17, 2026. Check the current offer, seller, availability, and shipping details on Amazon.
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Product photo by Tony Webster (CC BY 2.0). Full image credit