On/off
Press the switch for 0.5 seconds to turn on/off the light.
Output Selection
With the light switched on, single click the switch to cycle through Eco→Low→Med→High→Turbo.
Strobe
With the light switched on, press and hold the switch for 1.2 seconds to enter strobe.
Intelligent Memory Circuit
The light memorizes the last selected output excluding Turbo, High and Strobe. When turned on again the previously used mode will be recalled. The Med mode will be activated when turned on again if the light is turned off on Turbo and High modes.
Lock/Unlock
Lock: with the light unlocked and switched off, double click the switch within 0.5 seconds to lock the light, the light will blink twice on Eco to indicate locked status.
Unlock: with the light locked, double click the switch within 0.5 seconds, the light will be unlocked and activated on Eco.
*In locked status, clicking or pressing the switch will activate 2 one-second blinks on Eco to indicate locked status.
Battery Specifications
Only the ARB-L21 Series (21700 3.6V) batteries are recommended
* 21700 Li-ion batteries are powerful cells designed for commercial applications and must be treated with caution and handled with care. Only use quality batteries with circuit protection will reduce the potential for combustion or explosion; but cell damage or short circuiting are potential risks the user assumes.
Battery Replacement
Unscrew the light head and insert the battery with the anode side (+) towards the light head, then screw the light head back on.
Charging
- First switch off the light and plug the USB A socket of the charging cable into an electrical outlet, then connect the USB Type-C socket of the charging cable to the light.
- The indicator will display red while charging, and will turn green when fully charged.
- Once charging is completed, be sure to close the anti-dust cover to maintain the dustproof and waterproof ability.
- Recommended to use 5V/2A and above adapter.
Note:
- The normal charging time of the included Fenix ARB-L18-5000 V2.0 rechargeable battery is approximately 3 hours from depletion to full charging.
- Recharge a stored light every four months to maintain the optimum performance of the battery.
- Do not take out the battery during charging, and the light is available while charging (excluding Turbo, High and Strobe).
Battery Level Indication
With the light switched off, single click the side switch to check the battery status, the indicator with last for 3 seconds. Each time the light is turned on, the indicator in the neck of the flashlight will indicate the battery level and will last for 3 seconds.
- Green light on: saturated 100% - 85%
- Green light flashes: sufficient 85% - 50%
- Red light on: poor 50% - 25%
- Red light flashes: critical 25% - 1%
Note: This only works with Fenix ARB-L21 series rechargeable battery.
Intelligent Overheat Protection
The light will accumulate a lot of heat when used on High or Turbo modes for extended periods. When the light reaches a temperature of 60°C or above, the light will automatically step down a few lumens to reduce the temperature. When the temperature drops below 60°C, it will then allow the user the reselection of High or Turbo modes.
Low-voltage Warning
When the voltage level drops below the preset level, the flashlight is programmed to downshift to a lower brightness level until Eco mode is reached. When this happens in Eco mode, the battery level indicator constantly blinks red to remind you to timely recharge or replace the battery.
Note: This only works with Fenix ARB-L21 series rechargeable battery.
Usage and Maintenance
- Disassembling the sealed head can cause damage to the light and will void the warranty.
- Fenix recommends using only a high-quality protected battery.
- If the light will not be used for an extended period, remove the battery for proper storage.
- Lock the light or remove the battery to prevent accidental activation during storage or transportation.
- Long-term use can result in O-ring wear. To maintain a proper water seal, replace the ring with an approved spare．
- Periodic cleaning of the battery contacts improves the light's performance as dirty contacts may cause the light to flicker, shine intermittently or even fail to illuminate for the following reasons:
A: Poor battery level.
Solution: Recharge or replace the battery
B: The contact or contact point of the battery or flashlight is dirty.
Solution: Clean the contact points with a cotton swab soaked in rubbing alcohol.
If the above methods don't work, please contact your authorized distributor.
Warning
- Do place this light out of the reach of children!
- Do NOT shine the light directly into the eyes of anyone!
- Do NOT shine flammable objects at close range, to avoid burning objects or causing danger due to high temperature!
- Do NOT use the light in inappropriate ways such as biting in the mouth, to avoid personal injury or life threats when the light or internal battery fails!
- This light will accumulate a lot of heat while working, resulting in a high temperature of the flashlight shell. Pay attention to safe use to avoid scalding.
- Turn off and lock the light or remove the battery from the light to prevent accidental activation when the light is placed in a closed and flammable environment such as pockets and backpacks!
- The LED of this flashlight is not replaceable; so the whole light should be replaced when the LED reaches the end of its life.
