Switches

The round tail switch is the tactical switch for instant activation.

The oval tail switch is the functional switch for output selection and instant strobe.

On/off

Tap the tactical switch to momentarily turn on the light, release it and the light will go out.

Fully press the tactical switch to constantly turn on/off the flashlight.

Output Selection 

With the light switched on, single click the functional switch to cycle through Low→Med→High→Turbo.

With the light switched on, press and hold the functional switch to enter the strobe mode, single click the functional switch once again to cycle through Strobe→SOS. 

Strobe

With the light switched off, press the functional switch to enter the strobe mode, release it and the light will go out.

With the light switched on, press and hold the functional switch to enter the strobe mode.

Intelligent Memory Circuit

The light memorizes the last selected output excluding strobe and SOS. When turned on again the previously used output will be recalled.

Battery Specifications

*21700 Li-ion batteries are powerful cells designed for commercial applications and must be treated with caution and handled with care. Only using quality batteries with circuit protection will reduce the potential for combustion or explosion. Cell abuse or short circuiting are considered user induced damage and are not covered by any Fenix warranty or liability.

Battery Replacement

Unscrew the tail cap and insert the battery with the anode side (+) towards the light head, then screw the tail cap back on.

Charging

1. Open the anti-dust cover to reveal the USB Type-C charging port and plug the USB-A socket of the charging cable into an an appropriate AC powered USB plug/outlet, then connect the USB Type-C socket of the charging cable to the flashlight.

2. The indicator will display red while charging, and will turn to green when fully charged. 

3. Once charging is completed, be sure to unplug the charging cable and close the anti-dust cover. 

Note:

1. When charging fails or the battery is inserted backwards, the battery level indicator will flash red to notify the user to check the battery condition.

2. The normal charging time of the flashlight is approximately 3.5 hours from depletion to fully charged. The flashlight cannot be operated while charging.

3. Recharge a stored light every four months to maintain the optimum performance of the battery.

*Note: These features only works with a Fenix ARB-L21 series rechargeable battery.

Battery level indication

Each time the light is turned on, the indicator 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 feature only works with a Fenix ARB-L21 series rechargeable battery.

Intelligent Overheat Protection            

The lamp will accumulate a lot of heat when used at high output levels for extended periods. When the light reaches a temperature of 65°C/149°F or above, the light will automatically step down a few lumens to reduce the temperature. When the temperature drops below 65°C/149°F, 

the light automatically recalls the previously used output level.

Low-voltage Warning

When the voltage level drops below the preset level, the lamp is programmed to downshift to a lower brightness level until Low output is reached. When this happens in Low output, the battery level indicator blinks red to remind you to replace or recharge the battery. 

*Note: This feature only works with a 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 an excellent quality battery. 
• If the light will not be used for an extended period, remove the battery, or the light could be damaged by electrolyte leakage or battery explosion.
• 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 lamp's performance as dirty contacts may cause the lamp to flicker, shine intermittently or even fail to illuminate for the following reasons:
  A: Poor battery level.
  Solution: Replace or recharge the battery (Ensure the battery is inserted according to the manufacturer’s specifications).
  B: The threads, PCB board contact or other contacts are 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 NOT place this flashlight in the reach of children!
• Do NOT shine the flashlight directly into the eyes of anyone!
• Do NOT place light head near flammable objects as high temperatures can cause objects to overheat and become flammable/ignite!
• Do NOT use the flashlight in inappropriate ways such as holding the unit in your mouth. If the battery were to fail while doing so death or serious injury could result.
• This flashlight will accumulate a lot of heat while operating, resulting in a high temperature of the flashlight outer case. Pay close attention to the thermal condition of the flashlight to avoid burns.
• Remove the battery from the flashlight to prevent accidental activation when the flashlight is placed in a closed-in and flammable environment such as pockets and backpacks!
• The LED of this flashlight is not replaceable; so the whole flashlight will need to be replaced when the LED reaches the end of its lifespan.

What kind of LED is used in HT18R?

A: A Luminus SFT70 white LED with a lifespan of 50,000 hours.

What is the product positioning of HT18R? 

A: The Fenix HT18R is specifically designed for outdoor hunting.

What is the color temperature of HT18R?

A: Around 6500K.

What is the operating voltage of HT18R?

A: The operating voltage is 3.0 - 4.2 V.

How to prevent accidental activation of the HT18R?

A: Unscrew the light cap, or remove the battery to prevent accidental activation.

Why does the HT18R downshift to a lower mode after being used for a while and the higher mode cannot be selected?

A: There are two reasons:

1. Intelligent Overheat Protection

The flashlight will accumulate a lot of heat when used at high output levels for extended periods. When the light reaches a temperature of 65°C or above, the light will automatically step down a few lumens to reduce the temperature. 

2. Low-voltage Warning

When the voltage level drops below the preset level, the flashlight is programmed to downshift to a lower brightness level until the Low mode is reached. 

 Why does the HT18R happen to flicker?

A: The reasons that may cause the light to flicker, shine intermittently or even fail to illuminate:

1. Poor battery level.

Solution: Recharge or replace the battery.

2. 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.

What kind of battery can be used in HT18R?

A: It is recommended to use a Fenix ARB-L21-5000 V2.0 battery, a Fenix ARB-L21-5000U battery, or a Fenix ARB-L21-4000P battery. Other Li-ion batteries are not recommended. As an unmatched battery may cause the flashlight to fail to work normally.

Is the HT18R internally waterproof?

A. Yes, the light is internally waterproof and is thus still waterproof without the port cover in place.

What should I do if the HT18R needs repair?

A: 

1. 15-day replacement: Fenix will replace identical or equal products with documented manufacturing defects within 15 days of purchase.
2. 5-year free repair: Fenix will repair a light free of charge within 5 years (rechargeable battery and other accessories: 1 year) of purchase if problems develop with normal use.
3. Lifetime limited warranty: If repair is required after 5 years from the date of purchase, Fenix will charge for parts. The total repair fee is dictated by the cost of the replaced materials.
4. If you need warranty service, fill out the warranty form at https://www.fenixlighting.com/pages/warranty-repairs to start your repair claim.