Summary#
The NOCO Boost GB40 is a 1000-amp portable lithium jump starter that safely revives dead car batteries in seconds with spark-proof technology. With up to 20 jump starts per charge, a built-in power bank, 100-lumen LED flashlight, and IP65 waterproof rating at just 2.5 pounds, it's the essential emergency tool for any vehicle up to 6.0L gas or 3.0L diesel engines.
At a Glance#
Product : NOCO Boost GB40 Jump Starter
Brand : NOCO
Best For : Drivers who want reliable emergency starting power without the hassle of traditional jumper cables
Form Factor : Portable lithium battery pack with clamps
Buy Now : NOCO Boost GB40 on Amazon
Key Highlights:
- 1000 peak amps safely starts most passenger vehicles
- UltraSafe spark-proof and reverse polarity protection
- Up to 20 jump starts on a single charge
- Built-in USB power bank for emergency device charging
- Compact 2.5 lb design fits in glove box or trunk
Who Should Buy This#
The NOCO GB40 eliminates the worst-case scenario every driver fears: a dead battery far from help. Traditional jumper cables require another vehicle, the right technique, and can damage electronics if connected wrong. The GB40 does it all by itself, safely, in under 30 seconds.
Perfect for:
- Solo drivers who commute alone and can't rely on strangers for a jump
- Parents with teen drivers who want foolproof emergency equipment in every car
- Classic car enthusiasts who store vehicles for months and return to dead batteries
- Road trip families who travel through remote areas with limited roadside assistance
Design & Build Quality#
The GB40 packs serious power into a surprisingly compact package. At just 7.2 x 3.4 x 1.6 inches and 2.5 pounds, it tucks into a glove compartment or sits unobtrusively in a trunk emergency kit.
The rubberized housing feels industrial-strength despite its portable size. NOCO rates it IP65 for water and dust resistance - meaning it survives rain, snow, and the general abuse of life in a vehicle. The heavy-duty clamps connect securely and feature the same rubberized overmolding for confident grip even with wet or oily hands.
Key Features#
UltraSafe Spark-Proof Technology#
Traditional jumper cables create visible sparks when connecting, which can ignite battery gases in rare but dangerous situations. The GB40's patented UltraSafe technology eliminates this entirely - the unit won't deliver power until it detects a proper connection. Connect the clamps in any order, even touch them together accidentally, and nothing happens until you're connected correctly.
Reverse polarity protection means even if you connect red to black and black to red, the GB40 simply won't activate. No sparks, no damage, no fried electronics. For drivers who've never jump-started a car before, this foolproof safety is worth the premium alone.
1000 Peak Amps of Starting Power#
The lithium battery delivers 1000 peak amps - enough to crank engines up to 6.0 liters gasoline or 3.0 liters diesel. That covers virtually every passenger car, SUV, pickup truck, and crossover on the road today. You'll get up to 20 jump starts from a single charge on typical 4-cylinder vehicles, fewer on larger V8 engines but still multiple starts.
The high-discharge lithium technology maintains power even in cold weather, unlike traditional lead-acid jump packs that lose capacity when you need them most.
Integrated Power Bank#
The USB-A port transforms the GB40 into an emergency power bank delivering 2.1 amps to smartphones, tablets, and other USB devices. Stranded with a dead car battery AND a dead phone? The GB40 handles both.
While it won't replace a dedicated high-capacity power bank, having emergency phone charging capability integrated into your jump starter means one less device to remember.
100-Lumen LED Flashlight#
Seven light modes including steady on, strobe, and SOS turn the GB40 into an emergency beacon. The 100-lumen output illuminates engine bays for nighttime jump starts or signals for help on dark roadsides. It's bright enough to be useful without being a gimmick.
Technical Specifications#
Peak Amps : 1000A
Cranking Amps : 500A
Battery Capacity : Lithium-ion (internal)
Engine Compatibility : Up to 6.0L gas, 3.0L diesel
Jump Starts Per Charge : Up to 20
USB Output : 5V 2.1A (USB-A)
LED Flashlight : 100 lumens, 7 modes
Water Resistance : IP65
Dimensions : 7.2 x 3.4 x 1.6 inches
Weight : 2.5 lbs (1.1 kg)
Recharge Time : 3 hours
Pros & Cons#
Pros:
- UltraSafe technology makes wrong connections impossible
- Compact enough for glove box storage
- Up to 20 jump starts handles repeated emergencies
- Built-in USB charging rescues dead phones too
- 100-lumen LED flashlight with emergency modes
- IP65 rating survives automotive environment abuse
Cons:
- Won't start very large engines (over 6.0L gas)
- USB-A only, no modern USB-C power delivery
- Requires recharging every 3-6 months even unused
- Higher cost than traditional jumper cables
Final Verdict#
Buy it. The NOCO Boost GB40 transforms a stressful emergency into a 30-second inconvenience. The UltraSafe technology means anyone can use it correctly regardless of mechanical experience, and the compact size means you'll actually keep it in your vehicle instead of leaving it in the garage.
Our recommendation: Get one for every vehicle your family drives. At this price point, the peace of mind is worth it - and with 122,000+ reviews averaging 4.6 stars, you're in good company. NOCO Boost GB40 on Amazon