On/Off

Tap the tail switch to momentarily activate the light (release and the light will go out), fully press to constantly activate the light, then press again to turn off the light.

Output Selection for the HT18

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

Strobe

With the light switched on, press and hold the side switch for 0.8 seconds to enter strobe, single click the side switch again to turn back to the previously used general mode.

HT18 Intelligent Memory Circuit

The light memorizes the last selected brightness level on general mode (excluding strobe). When turned on again the previously used brightness level will be recalled.

Battery Specifications

Warning: 

1. The Fenix dedicated ALF-18 battery holder must be used together when using 18650 Li-ion battery.
2. Do not use CR123A or 16340 battery. Doing so may cause damage to the flashlight or the battery being used.

*18650 /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; but cell damage or short circuiting are potential risks the user assumes.

Battery Replacement of HT18

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

Battery level indication

When the light is switched on, the battery level indicator inside the side switch will light up to display the battery status, the indicator will stay on for 3 seconds before it goes off. 

• 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 21700 and Fenix ARB-L18 Series 18650 rechargeable Li-ion battery.

Intelligent Protection

The light will accumulate a lot of heat when used on Turbo output level for extended periods. When the light reaches a temperature of 65°C or above, the light will automatically step down by a few lumens to reduce temperature, until it reaches the output of 800 lumens. When the temperature has been reduced, the output will gradually return to Turbo. Note: The above data is the test results given by Fenix through its laboratory testing. The true performance may vary according to different working environments.

Low-voltage Warning

When the voltage level drops below the preset level, the flashlight is programmed to downshift to a lower brightness level until Low output is reached. When this happens in Low output mode, the indicator in the mid of the side switch will flash red to remind you to recharge or replace the battery. To ensure normal use, the flashlight will not turn off automatically and will work till the battery runs out completely. Note: This only works with Fenix ARB-L21 Series 21700 and Fenix ARB-L18 Series 18650 rechargeable Li-ion battery.

Usage and Maintenance of the Fenix HT18 Long Distance Hunting Flashlight

• 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.
• Li-ion battery needs to be charged even if the battery is not exhausted, charge immediately when the battery is exhausted; it has no memory effect.
• Unscrew the tail cap half a turn or take out 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: The battery needs replacing. 
  Solution: Replace battery (Ensure 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

1. This flashlight is a high-intensity lighting device capable of causing eye damage to the user or others. Avoid shining the flashlight directly into anyone’s eyes.
2. This flashlight will accumulate a lot of heat when used for extended periods, resulting in high temperature of the flashlight shell. Pay attention to safe use to avoid scalding.

FAQs about HT18 flashlight 

Q1. What is the product positioning of HT18? And who are the target customers? 

A: The Fenix HT18 is specially designed for hunting illumination. It stands out with its surprisingly long-distance beam shot of 925 meters, different hunting environments can be easily managed when filter adapters of red and green are added. Included a large-capacity Fenix ARB-L21-5000U USB rechargeable 21700 Li-ion battery; and one 18650 rechargeable Li-ion battery can be used as well by combination of the Fenix ALF-18 battery holder. Taking various application scenes into consideration, there are four output levels for free option. IP68 rating and tactical tail switch, this HT18 is bound to be the trustworthy helper in long-distance lighting such as hunting and searching. 

Q2. What are the key features and benefits of HT18? 

A: 1) 1500 lumens maximum output and 1011 yards (925 meters) maximum beam distance.  

  2) Included a Fenix ARB-L21-5000U USB rechargeable 21700 Li-ion battery. 

  3) A 18650 rechargeable Li-ion battery can be used together with the ALF-18 battery holder. 

  4) Included red and green filter adapters, offering triple-colored lighting. 

  5) Instant power activation with momentary tactical tail switch. 

  6) Simple output selection with side switch. 

Q3. What kind of LED is used in HT18? 

A: One Luminus SFT40 LED with a lifespan of 50,000 hours. 

Q4. Does the lamp have intelligent protection? 

A: Yes. The light will accumulate a lot of heat when used on Turbo output level for extended periods. When the light reaches a temperature of 65°C or above, the light will automatically step down by a few lumens to reduce temperature, until it reaches the output of 800 lumens. When the temperature has been reduced, the output will gradually return to Turbo. 

Q5. What kinds of batteries can be used in HT18 ? 

A: Rechargeable 21700 Li-ion battery can be directly used; a 18650 rechargeable Li-ion battery can also be used together with the ALF-18 battery holder. 

Q6. What should I do if the HT18 needs repair?

A: 1. 15-day replacement: Fenix will replace identical or equal products with documented manufacturing defects within 15 days of purchase.

2. 2-year free repair: Fenix will repair a light free of charge within 2 years of purchase if problems develop with normal use.

3. Lifetime maintenance: If repair is required after 2 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.

Q7.  What are the parameters when used together with red and green filter adapters? 

A: See the parameters below: