Fenix UC35 V2.0 Flashlight

The Fenix UC35 V2.0 is a tactical, pocket-sized, compact tactical flashlight featuring micro USB recharging with included 3400mAh battery, exquisite appearance, far-reaching beam and one-handed operation. It is fitted with a CREE XP-L HI V3 LED that delivers an output of up to 1000 lumens and a max distance of 266 meters. One tactical tail switch and one functional side switch control five output levels and strobe mode. Boot-up battery level indication ensures users are well-prepared for their lighting needs.

Battery: 18650 (included) or CR123 or rechargeable
Max Lumens: 1000


In stock


  • Uses Cree XP-L HI V3 LED with a lifespan of 50,000 hours
  • Powered by a single 18650 rechargeable Li-ion battery (included) or two non-rechargeable CR123A batteries
  • 5 modes plus Strobe
  • Boot-up battery level indication and low-voltage warning (will only work with 18650 Li-ion battery)
  • Digitally regulated output maintains constant brightness
  • Reverse polarity protection, protects from improper battery insertion
  • Anti-roll and anti-slip body design
  • Tactical tail switch features instant activation
  • Functional metal side switch for output selection
  • Made of durable high strength and oxidation resistance aluminum
  • Premium type HAIII hard-anodized anti-abrasive finish
  • Toughened ultra-clear glass lens with an anti-reflective coating
  • IP68 rated protection

Technical Parameters

ANSI/PLATO FL1TurboHighMedLowMoonlightStrobe
OUTPUT1000 Lumens350 Lumens150 Lumens50 Lumens1 Lumen1000 Lumens
RUNTIME2h 5min4h 5min9h 55min27h 50min750h
WATERPROOFIP68, underwater 2m

Note: The abovementioned parameters (lab-tested by using Fenix ARB-L18-3400 18650 rechargeable Li-ion battery) may vary between flashlights, batteries and environments.

Included with Your Light

  • UC35 V2.0 flashlight
  • ARB-L18-3400 Li-ion battery
  • Micro USB charging cable, Body clip
  • Spare rubber switch boot
  • Lanyard, Holster
  • 2*Spare O-rings
  • User manual
  • Warranty card
  • Information leaflet

Operating Instructions


The tail switch is the tactical, and the side switch the functional switch.



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

Fully press

Fully press the tactical switch to constantly turn on the light; press once again to turn off the light.

Output Selection

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


With the light switched on, press and hold the functional switch for 0.5 seconds to enter strobe, click once again to return to General mode.

Boot-up Battery Level Indication

Each time the light is turned on, the battery level indicator will automatically display the battery status for 3 seconds.

Green constant on: saturated

Green flashes: sufficient

Red constant on: poor

Red flashes: critical

Note: There is no indication when CR123A battery is used.

Intelligent Memory Circuit

The light memorizes the last selected brightness level on General mode. When turned on again the previously used brightness level will be recalled.

Intelligent Protection

The light will accumulate a lot of heat when working at Turbo mode. When the light is overheated up to 60°C or above, the flashlight will automatically step down a few lumens to reduce the temperature; when the temperature is lower than 60°C the output will gradually return to Turbo output level.

Low-voltage Warning

When the voltage level drops below 3V, the flashlight is programmed to downshift to a lower brightness level until Moonlight output is reached. When this happens in Moonlight mode, the battery level indicator will flash red to remind you to replace the battery. To ensure normal use, the flashlight will work until the battery runs out or the battery over-discharging protection activates.

Note: This only works with rechargeable Li-ion 18650 battery.


  1. Turn off the light. Plug the USB side of the charging cable into any USB power supply. Uncover the dust cover of the light, and plug the Micro USB side of the charging cable into the charging port of the light.
  2. The battery level indicator displays red while charging and turns to solid green when charging is complete. The normal charging time of the included Fenix ARB-L18-3500 is about 3.5 hours.
  3. Once charging is completed, be sure to remove the charging cable and replace the dust cover to protect against dust and foreign objects.
  4. Recharge a stored light every four months to maintain optimum performance of the battery.
  5. Only Low output can be used while the light is being charged, but charging time will be prolonged.

Battery Specifications

TypeDimensionsNominal VoltageUsability
Fenix ARB-L18 Series186503.6V/3.7VRecommended✓✓
Non-rechargeable Battery (Lithium)CR123A3VUsable (No charging)
Rechargeable Battery (LiFePO4)163403.2VUsable (No charging)
Rechargeable Battery (Li-ion)186503.6V/3.7VCautious*!
Rechargeable Battery (Li-ion)163403.6V/3.7VBanned
Rechargeable Battery (LiFePO4)186503.2VBanned


  1. Do not mix batteries of different brands, sizes, capacities or types. Doing so may cause damage to the flashlight or the batteries being used.
  2. Flat top batteries cannot be used because of the flashlight design.

*18650/16340 Li-ion batteries are powerful cells designed for commercial applications and must be treated with caution and handled with care. 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 tail cap to insert the battery with the anode side (+) towards the light head, then screw the tail cap back on.

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.
  • 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.


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.


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