Milwaukee 2160-21
Milwaukee REDLITHIUM USB 800L Compact Flashlight Instruction Manual
Model: 2160-21
1. Introduction
This manual provides essential information for the safe and efficient operation, maintenance, and troubleshooting of your Milwaukee REDLITHIUM USB 800L Compact Flashlight. Please read this manual thoroughly before using the product and retain it for future reference.
2. Package Contents
Verify that all items listed below are included in your package. If any items are missing or damaged, please contact Milwaukee customer support.
- Milwaukee REDLITHIUM USB 800L Compact Flashlight
- REDLITHIUM™ USB 3.0 Battery (1 included)
- 2FT Heavy Duty USB Cord

Figure 2.1: Included components of the Milwaukee REDLITHIUM USB 800L Compact Flashlight.
3. Product Features
- TRUEVIEW™ High Definition Output: Delivers 800 lumens for clear visibility.
- Bulls-Eye Beam: Combines spotlight intensity with floodlight coverage for versatile illumination.
- REDLITHIUM™ USB 3.0 Battery: Provides extended runtime and fast charging.
- Durable Construction: IP67 rated for water and dust resistance, and 4-meter drop rated.
- Multi-Functional Button: Offers battery charge status, mode selection, and mode memory.
- Removable Clip: Allows for convenient attachment to pockets or tool bags.

Figure 3.1: Key features and components of the flashlight.
4. Setup
4.1 Battery Installation
- Unscrew the tail cap of the flashlight by turning it counter-clockwise.
- Insert the REDLITHIUM™ USB 3.0 Battery with the positive (+) end facing towards the flashlight head.
- Screw the tail cap back on clockwise until secure.
4.2 Initial Charging
Before first use, fully charge the battery.
- Locate the protective slide on the side of the flashlight. Slide it to reveal the Micro USB charging port.
- Connect the provided 2FT Heavy Duty USB Cord to the flashlight's Micro USB port.
- Connect the other end of the USB cord to a compatible USB power source (e.g., wall adapter, computer USB port).
- The multi-functional button will illuminate to indicate charging status. A solid green light typically indicates a full charge.
- Once fully charged, disconnect the USB cord and close the protective slide over the charging port.

Figure 4.1: Battery insertion and USB charging port location.
5. Operating Instructions
5.1 Power On/Off
- To turn the flashlight ON, press the multi-functional button once.
- To turn the flashlight OFF, press the multi-functional button again.
5.2 Mode Selection
The flashlight features two light output modes:
- High Mode (800 Lumens): Provides maximum brightness for 2.5 hours.
- Low Mode (100 Lumens): Extends runtime up to 11 hours.
To switch between modes, press and hold the multi-functional button while the flashlight is on. The flashlight will cycle between High and Low modes. Release the button to select the desired mode. The flashlight has mode memory and will turn on in the last used mode.
5.3 Battery Status Indicator
The multi-functional button also serves as a battery charge status indicator:
- Solid Green: 75-100% charge
- Solid Amber: 50-74% charge
- Solid Red: 25-49% charge
- Flashing Red: 0-24% charge (recharge immediately)
6. Maintenance
6.1 Charging the Battery
Recharge the REDLITHIUM™ USB 3.0 Battery using the provided USB cable and a compatible USB power source. The battery can be charged while inside the flashlight or removed and charged separately if you have an external charger (sold separately).
6.2 Cleaning
Wipe the flashlight with a soft, damp cloth. Do not use harsh chemicals or abrasive cleaners. Ensure the charging port cover is closed when cleaning to maintain water and dust resistance.
6.3 Storage
Store the flashlight in a cool, dry place away from direct sunlight and extreme temperatures. For long-term storage, ensure the battery is partially charged (around 50%) to prolong its lifespan.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Flashlight does not turn on. | Battery is depleted or incorrectly installed. | Charge the battery. Ensure the battery is inserted with the correct polarity and the tail cap is securely tightened. |
| Light output is dim. | Battery is low or flashlight is in Low Mode. | Recharge the battery. Press and hold the button to switch to High Mode. |
| Flashlight not charging. | USB cable or power source issue; charging port not fully exposed. | Ensure the USB cable is properly connected and the power source is active. Verify the protective slide is fully open to expose the charging port. Try a different USB cable or power source. |
8. Specifications
| Feature | Detail |
|---|---|
| Brand | Milwaukee |
| Model Number | 2160-21 |
| Light Output (High) | 800 Lumens |
| Light Output (Low) | 100 Lumens |
| Runtime (High) | 2.5 hours |
| Runtime (Low) | 11 hours |
| Beam Distance | 150 meters (492 feet) |
| Ingress Protection (IP) Rating | IP67 (Waterproof & Dustproof) |
| Drop Rating | 4 meters |
| Power Source | REDLITHIUM™ USB 3.0 Battery |
| Material | Aluminum |
| Dimensions (D x W x H) | 5.59" x 1.14" x 1.22" |
| Item Weight | 5.81 ounces |
| UPC | 045242570591 |

Figure 8.1: The flashlight's IP67 rating ensures durability in challenging environments.
9. Warranty and Support
The Milwaukee REDLITHIUM USB 800L Compact Flashlight is backed by a Limited Lifetime Warranty. For detailed warranty information, service, or technical support, please refer to the official Milwaukee website or contact their customer service department.
Online Support: Visit www.milwaukeetool.com
Ask a question about this manual
Ask about setup, troubleshooting, compatibility, parts, safety, or missing instructions. Manuals+ will review the question and use this page’s manual context to help answer it.






