Introduction
This manual provides detailed instructions for the safe and effective use of your Nitecore EDC31 Flashlight. Please read this manual thoroughly before operating the device and retain it for future reference.

Image: The Nitecore EDC31 flashlight, accompanied by its USB-C charging cable, a lanyard, and a Nitecore sticker, showcasing the complete package contents.
Package Contents
- Nitecore EDC31 Flashlight
- USB-C Charging Cable
- Lanyard
- Clip
- Nitecore Sticker
Setup
1. Initial Charging
Before first use, fully charge the Nitecore EDC31. Connect the provided USB-C charging cable to the flashlight's charging port and to a USB power source. The power indicator lights will show charging status.

Image: Close-up of the USB-C charging port on the Nitecore EDC31 flashlight, indicating where to connect the charging cable.
2. Attaching the Lanyard and Clip
Attach the lanyard to the designated loop on the flashlight for secure carrying. The clip can be used to secure the flashlight to pockets, belts, or gear.
Operation
Tactical Tail Button

Image: A diagram illustrating the functions of the tactical tail button: a half press adjusts brightness levels or activates SEARCH mode, while a full press turns the flashlight on/off or activates LUMIN SHIELD™.
- Half Press: Adjusts brightness levels or activates SEARCH mode.
- Full Press: Turns the flashlight On/Off or activates LUMIN SHIELD™.
Rapid Lock™ Mechanism
The EDC31 features a sliding lock switch to prevent accidental activation.

Image: A close-up view of the Rapid Lock™ sliding switch on the Nitecore EDC31, showing its position for seamless operation and preventing accidental activation.
- Full Lockout Mode: Slide the Rapid Lock™ to the locked position to completely prevent activation.
- Half Lockout Mode: Allows access to certain functions while preventing others.
- Unlock: Slide the Rapid Lock™ to the unlocked position for full functionality.
Brightness Levels and Modes
The EDC31 offers multiple brightness levels and specialized modes:
- LUMIN SHIELD™ (Floodlight): 3,500 Lumens. Activated by a full press and hold of the Tactical Tail Button. (Unavailable in Full Lockout Mode).
- SEARCH (Spotlight): 1,500 Lumens, 380m range. Activated by a half press and hold of the Tactical Tail Button. (Unavailable in Full Lockout Mode).
- High: 1,100 Lumens.
- Mid: 300 Lumens.
- Low: 70 Lumens.
- Ultralow: 5 Lumens.

Image: The Nitecore EDC31 flashlight emitting a wide, powerful 3500-lumen LUMIN SHIELD™ beam, illustrating its use for instant personal defense.

Image: The Nitecore EDC31 flashlight projecting a focused beam for 380 meters in Tactical SEARCH Mode, cutting through darkness.
Power Level Display
The flashlight features four green indicator lights to display the remaining battery power:

Image: A diagram showing the four green LED indicators on the Nitecore EDC31, representing battery levels from 75-100% (4 lights) down to 0-25% (1 light).
- 4 Constant-on: 75% - 100%
- 3 Constant-on: 50% - 75%
- 2 Constant-on: 25% - 50%
- 1 Constant-on: 0% - 25% (Charge as soon as possible)
Maintenance
Cleaning
Wipe the flashlight body with a clean, soft cloth. For stubborn dirt, a slightly damp cloth can be used. Avoid using harsh chemicals or abrasive materials.
Battery Care
To maintain optimal battery life, charge the flashlight regularly. Avoid fully depleting the battery for extended periods. If storing the flashlight for a long time, charge it to approximately 50% every few months.
Water Resistance
The EDC31 has an IP68 rating, meaning it is waterproof and submersible up to 2 meters. Ensure the USB-C port cover is securely closed before exposing the flashlight to water.
Troubleshooting
- Flashlight not turning on:
- Ensure the Rapid Lock™ switch is in the unlocked position.
- Check battery level and recharge if necessary.
- Ensure the tail cap is tightened securely.
- Light output is dim or inconsistent:
- Recharge the battery.
- Clean the lens and reflector with a soft cloth.
- Flashlight gets hot on high settings:
- This is normal for high-lumen flashlights due to heat dissipation. The EDC31 has built-in thermal regulation to prevent overheating, which may cause a temporary step-down in brightness.
- Avoid prolonged use on the highest settings if heat is a concern.
Specifications

Image: A table detailing the technical specifications of the Nitecore EDC31, including lumens, runtime, beam distance, and intensity for various modes.
| Feature | LUMIN SHIELD™ (Floodlight) | SEARCH (Spotlight) | HIGH | MID | LOW | ULTRALOW |
|---|---|---|---|---|---|---|
| Brightness | 3,500 Lumens | 1,500 Lumens | 1,100 Lumens | 300 Lumens | 70 Lumens | 5 Lumens |
| Runtime | — | — | 4h | 5h | 24h | 57h |
| Beam Distance | 330m | 380m | 200m | 173m | 85m | 20m |
| Peak Beam Intensity | 28,800cd | 35,630cd | 10,098cd | 7,489cd | 1,826cd | 109cd |
| Impact Resistance | 2m | |||||
| Waterproof Rating | IP68, 2m (Waterproof and Submersible) | |||||
Note: The stated data is measured in accordance with the International flashlight testing standards ANSI/PLATO FL1-2019 using the built-in Li-ion battery (3,800mAh). Data may vary in real-world use due to different environmental conditions.
General Specifications
- Special Features: Durable, High Lumens, Impact Resistant, Lightweight, Rechargeable
- Color: Black
- Power Source: Battery Powered (Built-in Lithium Ion)
- Light Source Type: LED
- Material: Anodized Aluminum
- Product Dimensions: 0.89"D x 0.91"W x 4.46"H (22.6mm D x 23.1mm W x 113.2mm H)
- Item Weight: 4 ounces (100g)
- Voltage: 3.7 Volts (DC)
- Battery: Built-in Lithium Ion (Note: Some source data indicates '1 AA batteries required', which contradicts the built-in Li-ion battery mentioned elsewhere. The primary power source is the built-in Li-ion.)
- Model Number: EDC31

Image: A diagram illustrating the compact dimensions and weight of the Nitecore EDC31 flashlight, highlighting its suitability for everyday carry.
Warranty Information
The Nitecore EDC31 Flashlight comes with a Limited Warranty. For detailed information regarding warranty terms, conditions, and duration, please refer to the official Nitecore website or contact their customer support directly. Please retain your proof of purchase for warranty claims.
Support and Contact
For further assistance, technical support, or inquiries, please visit the official Nitecore website or contact their customer service. You can also visit the Nitecore Store on Amazon.
Manufacturer: Sysmax Innovations Co.





