NOCO GB40 Manual: A Comprehensive Guide
This manual details installation‚ operation‚ and maintenance for optimal performance of your NOCO Genius Boost GB40‚ offering a complete resource for users.
The NOCO GB40 is an ultra-compact‚ portable lithium jump starter designed for a wide range of vehicles – cars‚ boats‚ motorcycles‚ trucks‚ and more. It’s a powerful device capable of delivering 1‚000 Amps of peak current‚ making it suitable for engines up to 6-liter gasoline and 4-liter diesel. Beyond jump-starting‚ the GB40 functions as a portable power bank‚ featuring USB ports for charging smartphones‚ tablets‚ and other USB devices.
This manual provides comprehensive instructions on safely and effectively utilizing all the features of your GB40. It covers everything from understanding the LED indicators to detailed jump-starting procedures‚ charging options‚ and essential safety precautions. Properly following these guidelines will ensure reliable performance and longevity of your NOCO Genius Boost GB40.
What’s Included in the Box
Upon opening your NOCO GB40 package‚ you should find the following components: the NOCO Genius Boost GB40 portable jump starter‚ a set of heavy-duty jumper cables with positively and negatively marked clamps‚ a USB charging cable for recharging the GB40 itself‚ a microfiber storage bag to protect the device‚ and this comprehensive user manual.
Additionally‚ the box contains a quick start guide for immediate use and a list of safety precautions. Carefully inspect all items to ensure everything is present and undamaged. If any components are missing or appear defective‚ immediately contact NOCO support for assistance. Retain the original packaging for potential warranty claims or returns.

Understanding the GB40 Features
The NOCO GB40 is an ultra-compact lithium jump starter‚ power bank‚ and USB device charger‚ designed for versatility and portability.
LED Indicators and Their Meanings
The GB40 utilizes a series of LED indicators to communicate its status. A solid green light signifies a fully charged unit‚ ready for use. Flashing green indicates a charging process is underway. Red LEDs display the battery’s state of charge‚ decreasing with use – three lights mean 75%‚ two indicate 50%‚ one shows 25%‚ and a flashing red light signals low charge requiring immediate recharging.
During jump starting‚ the LEDs also provide crucial feedback. A blinking red light during the process suggests a poor connection‚ while a solid red light indicates an error. Understanding these visual cues ensures safe and effective operation of your NOCO GB40‚ preventing potential issues and maximizing its lifespan.
Safety Precautions
Always wear eye protection when working near a vehicle battery. Batteries contain corrosive acid and can explode. Never attempt to jump start a damaged battery. Ensure proper ventilation during charging and use; batteries release flammable gases. Do not expose the GB40 to extreme temperatures or moisture.
Avoid short-circuiting the clamps. Connecting the positive and negative clamps directly can cause sparks and damage. Disconnect the GB40 immediately if sparks occur. This device is not intended for use by children. Read all instructions carefully before operation to ensure safe and effective use of your NOCO Genius Boost GB40.
Technical Specifications
The NOCO GB40 is a lithium-ion jump starter with 1000 peak amps and 750 cranking amps. It features a battery capacity of 16‚000mAh and can start vehicles up to 6.0-liter gasoline and 4.0-liter diesel engines. Input is 5V/2A‚ 12V/1A‚ and output via USB ports is 5V/2.1A.
Its dimensions are 6.5 x 2.8 x 0.8 inches‚ and it weighs approximately 2.4 pounds. The GB40 includes reverse polarity protection‚ over-charge protection‚ and short-circuit protection. Operating temperature ranges from 32°F to 104°F (0°C to 40°C). It functions as both a jump starter and a portable power bank for devices.

Using the NOCO GB40 for Jump Starting
Safely connect the GB40’s clamps to the vehicle battery terminals‚ following the correct polarity (red to positive‚ black to negative)‚ to initiate the jump start.
Connecting the GB40 to a Vehicle Battery
Before connecting the NOCO GB40‚ ensure the vehicle is turned off. Identify the battery terminals – positive (usually marked with a “+” symbol or red cover) and negative (usually marked with a “-” symbol or black cover). Attach the red clamp to the positive terminal first‚ then the black clamp to a solid‚ unpainted metal surface on the vehicle’s chassis‚ away from the battery.
Avoid connecting the black clamp directly to the negative battery terminal‚ as this can create sparks near the battery’s flammable gases. Double-check the connections to ensure they are secure and making good contact. Incorrect connections can damage the GB40 or the vehicle’s electrical system. A firm‚ stable connection is crucial for a successful jump start.
Jump Starting Procedure ⎼ Step-by-Step
Once the GB40 is securely connected‚ turn the unit ON by pressing the power button. The LED indicators will illuminate‚ showing the charge level. Attempt to start the vehicle as you normally would. If the engine doesn’t start immediately‚ wait up to 30 seconds before trying again. Avoid prolonged cranking (more than 10 seconds at a time) to prevent overheating the GB40.
If the vehicle still doesn’t start after several attempts‚ check the connections and consult a qualified mechanic. Once the vehicle starts‚ carefully disconnect the clamps in reverse order: black clamp first‚ then red clamp. Store the GB40 in a safe‚ dry place.
Safety Guidelines During Jump Starting
Always wear eye protection during jump starting to shield against potential sparks or acid spray. Ensure the vehicle is in Park or Neutral with the parking brake engaged. Do not smoke or allow open flames near the battery during the process. Avoid contact between the clamps; never allow them to touch each other or any metal part of the vehicle.

If the battery is cracked or leaking‚ do not attempt to jump start it. Disconnect all accessories before jump starting. Keep the GB40 away from flammable materials. Follow the vehicle manufacturer’s recommendations for jump starting procedures.

Charging the NOCO GB40
The GB40 can be charged via the included 12V DC adapter or a USB port‚ offering flexible charging options with varying time requirements.
Charging Options and Times
The NOCO GB40 offers versatile charging solutions to suit your needs. Utilizing the included 12V DC adapter‚ a full charge typically takes approximately 3-4 hours. This method is ideal for charging from a vehicle’s accessory socket or a standard wall outlet with an adapter. Alternatively‚ you can charge the GB40 via a USB port‚ though this method will significantly extend the charging time – potentially taking 8-12 hours for a complete recharge.
Charging time can also be influenced by the ambient temperature and the current charge level of the GB40. It’s recommended to charge the unit in a dry‚ well-ventilated area. The charging indicator lights provide real-time feedback on the charging progress‚ allowing you to monitor the status effectively. Always use the provided charging accessories to ensure optimal performance and safety.
Understanding the Charging Indicator Lights
The NOCO GB40 utilizes a series of LED indicator lights to communicate its charging status. A solid red light indicates the unit is currently charging and receiving power. When all four lights flash red‚ it signals a low-voltage condition or potential issue requiring attention. A solid green light signifies a full charge‚ meaning the GB40 is ready for use or can remain connected for maintenance charging.
During charging‚ the number of illuminated green lights represents the approximate charge level. For example‚ two green lights indicate roughly 50% charge. If the lights blink amber‚ it suggests a potential fault or overheating condition; disconnect and allow the unit to cool before attempting to recharge. Regularly checking these indicators ensures optimal performance and longevity.

GB40 as a Portable Power Bank
The NOCO GB40 functions as a power bank‚ utilizing its USB ports to conveniently charge smartphones‚ tablets‚ and other USB-powered devices.
Using the USB Ports for Device Charging
The NOCO GB40 boasts integrated USB ports‚ transforming it into a versatile portable power bank for your electronic devices. These ports allow you to conveniently charge smartphones‚ tablets‚ cameras‚ and other USB-powered gadgets directly from the GB40’s internal battery. Simply connect your device using a standard USB cable to one of the available USB outputs on the unit.
The GB40 typically features multiple USB ports‚ potentially including both standard USB-A and faster USB-C ports. Utilizing the USB-C port‚ when available‚ can significantly reduce charging times for compatible devices. The GB40 intelligently detects the connected device and delivers the appropriate charging current for optimal and safe charging performance. This feature ensures efficient power delivery and protects your devices from overcharging or damage;
Power Bank Capacity and Output
The NOCO GB40 offers substantial power bank capacity‚ capable of recharging smartphones multiple times and providing power to other USB devices. Its lithium-ion battery stores a significant amount of energy‚ making it a reliable power source when access to traditional outlets is limited. The exact capacity is typically measured in milliampere-hours (mAh)‚ and the GB40 delivers a robust output.
The USB output of the GB40 is generally rated at 5V/2.1A‚ providing sufficient power for most mobile devices. Some models may also include a USB-C port with Power Delivery (PD) for faster charging of compatible devices. Understanding the output specifications ensures you can efficiently charge your devices. The GB40’s power bank function is ideal for travel‚ emergencies‚ or any situation where a portable power source is needed.

Troubleshooting Common Issues
This section addresses typical problems like the GB40 failing to power on or experiencing jump-starting difficulties‚ offering solutions for quick resolution.
GB40 Won’t Turn On
If your NOCO GB40 fails to power on‚ begin by verifying it has sufficient charge. Connect the device to a power source using the included USB cable or a compatible wall adapter and allow it to charge for at least 30 minutes.
Ensure the charging indicator lights illuminate‚ confirming a charging connection. If no lights appear‚ try a different USB cable and power adapter. Next‚ confirm the power button is being pressed and held for the required duration – typically a few seconds.
Inspect the clamps for proper connection and ensure they aren’t damaged or corroded. A faulty connection can prevent the unit from activating. If the issue persists after these checks‚ contact NOCO support for further assistance‚ as it may indicate an internal malfunction.
Jump Starting Fails
If the NOCO GB40 fails to jump-start a vehicle‚ first re-check the clamp connections to the battery terminals. Ensure a secure‚ clean connection – corrosion or looseness can hinder the process. Verify correct polarity; red to positive (+) and black to negative (-).
Confirm the vehicle’s battery voltage is within the GB40’s specified range. Severely discharged or damaged batteries may not accept a charge. Allow the GB40 to connect for a few minutes to attempt to provide an initial charge before attempting to start the vehicle.
If repeated attempts fail‚ consult your vehicle’s manual or contact a professional mechanic‚ as there may be an underlying issue with the vehicle’s starting system.

Maintaining Your NOCO GB40
Proper storage and care extend the GB40’s lifespan and performance; keep it in a cool‚ dry place and clean the exterior regularly for best results.

Storage Guidelines
To maximize the lifespan of your NOCO GB40‚ proper storage is crucial. Ideally‚ store the unit in a cool‚ dry environment‚ away from direct sunlight and extreme temperatures. Avoid storing it in locations prone to humidity or freezing conditions‚ as these can negatively impact the internal battery.
It’s recommended to store the GB40 with approximately 50-75% charge. Fully charging and storing for extended periods can lead to reduced battery capacity over time. Periodically check the charge level – every six months is a good practice – and top it off if necessary.
Keep the GB40 away from metallic objects during storage to prevent accidental short circuits. Ensure the ports are clean and free from debris before long-term storage. Following these guidelines will help maintain the GB40’s performance and reliability for years to come.
Cleaning and Care
Maintaining your NOCO GB40’s cleanliness ensures optimal performance and longevity. Regularly wipe down the exterior with a soft‚ dry cloth to remove dust‚ dirt‚ and grime. Avoid using harsh chemicals‚ abrasive cleaners‚ or solvents‚ as these can damage the casing and internal components.
Inspect the clamps and cables for any signs of damage‚ such as cracks or fraying. If damage is detected‚ discontinue use and contact NOCO support. Clean the clamps with a slightly damp cloth‚ ensuring they are completely dry before storage or use.
Do not immerse the GB40 in water or any other liquid. Keep the USB ports free from debris. Proper cleaning and care will help preserve the GB40’s functionality and extend its useful life.

Warranty Information
NOCO GB40 comes with a warranty covering defects in materials and workmanship. Contact NOCO support for details and to initiate a claim if needed.
NOCO GB40 Warranty Details
NOCO Genius Boost GB40 is warranted against defects in materials and workmanship for a period of one year from the date of original purchase. This warranty covers the cost of repair or replacement of a defective unit. However‚ it does not cover damage caused by misuse‚ abuse‚ neglect‚ accidents‚ or unauthorized modifications.
The warranty is valid only for the original purchaser and is non-transferable. To make a warranty claim‚ you must provide proof of purchase and a detailed description of the defect. NOCO reserves the right to inspect the defective unit before determining whether to repair or replace it. This warranty gives you specific legal rights‚ and you may have other rights that vary from state to state.
Contacting NOCO Support
For assistance with your NOCO Genius Boost GB40‚ or to inquire about warranty claims‚ NOCO offers multiple support channels. You can reach their customer support team via phone during business hours‚ or through their comprehensive online help center‚ which features FAQs‚ troubleshooting guides‚ and downloadable manuals.
Additionally‚ NOCO provides email support for more complex issues. Their website‚ www.nooco.com‚ is the central hub for all support resources. NOCO encourages customers to visit the website first to find quick answers to common questions. Prompt and helpful assistance is their priority‚ ensuring a positive user experience with their products.