Fenix HM70R Rechargeable Headlamp

Max Lumens: 1600
Modes: 8
Battery: 21700
(40 customer reviews)


The Fenix HM70R Rechargeable Headlamp features a high-capacity 21700 battery, that not only boosts this headlamp to a maximum 1600 lumens, but also allows for a 100 continuous hour runtime when using 30 lumens on Low. Press and hold the large, glove-friendly switch to change over to the Functional mode to access two levels of neutral white light, a red reading light, and a red flash. The hidden USBC port adds to its IP68 dustproof/waterproof rating and allows you to quickly charge your headlamp with a 2A charging current. Battery level indicator, intelligent memory, and lock out function, round out the features of the Fenix HM70R Rechargeable Headlamp.

For commercial orders and large purchases, contact us at (888) 775-9996 x6, or
WARNING. Be aware of counterfeit Fenix merchandise in the U.S. marketplace.

Max Lumens: 1600
Modes: 8


HM70R Size

Length: 3.72” (94.5mm)
Width: 2.01” (51mm)
Height: 1.81” (46mm)

HM70R Weight

7.27 oz. (206g) including battery and headband

HM70R Battery Type

One included 21700 rechargeable li-ion battery


ARB-L21-5000 li-ion battery, USB Type-C charging cable, spare O-ring


Limited Lifetime Guarantee from Fenix Lighting USA

fenix hm70r ansi specs

Additional Features of the Fenix HM70R Rechargeable Headlamp

  • A Luminus SST40 white light LED, an XP-G2 HE neutral white LED and two 2835 red light LEDs.
  • Included a 21700 Li-ion battery, a 18650 Li-ion battery can be used as well (together with an ALF-18 battery holder).
  • White, neutral white and red lights combined.
  • Toughened ultra-clear glass lens with an anti-reflective coating.
  • Hidden USB Type-C charging port supports 2A charging current.
  • Large thumb-sized switch for easy and fast operation.
  • Digitally regulated circuit for maintaining a stable output.

Fenix HM70R Rechargeable Headlamp Operating Instructions


  • Press and hold the switch for 0.5 seconds to turn on/off the lamp.

Mode Switching

  • With the lamp switched off, single click the switch for 0.5 seconds to enter General mode, and double click the switch to enter Functional mode.
  • Press and hold the switch for 1.2 seconds to enter the other mode.

Output Selection

  • In General mode, single click the switch to cycle through Low→Med→High→Turbo.
  • In Functional mode, single click the switch to cycle through Red→Med→High→Red Flash.


  • Lock: when the lamp is switched off, press and hold the switch for 3 seconds, the lamp will blink red three times to indicate locked status. In locked status, clicking the switch will activate 3 one-second red blinks to indicate locked status.
  • Unlock: when the lamp is locked, press and hold the switch for 3 seconds, the lamp will be activated with 3 one-second red blinks and activated on Red Light mode.

Intelligent Memory Circuit
The headlamp memorizes the last selected output. When turned on again the previously used output will be recalled.

Battery Specifications for the Fenix HM70R Rechargeable Headlamp

Type Dimensions Nominal Voltage Usability  
Fenix ARB-L21 Series 21700 3.6V Recommended √√
Fenix ARB-L18 Series 18650 3.6V Usable (with ALF-18 battery holder)
Rechargeable Battery  (Li-ion) 16340 3.6V Banned ×
Rechargeable Battery  (Li-ion) 18650 3.6V Banned ×
 Rechargeable Battery (LiFePO4) 16340 3.2V Banned ×
 Rechargeable Battery (LiFePO4) 18650 3.2V Banned ×

Warning: *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 cap to insert the battery in accordance with the polarity marks, then screw the cap back on.

Indication: The indicator on the battery case will display red while charging, and will turn to green when fully charged. * This only works with Fenix ARB-L21-5000 battery.


  1. Uncover the anti-dust cap and plug the USB Type-C side of the charging cable into the charging port of the lamp.
  2. The normal charging time of the included Fenix ARB-L21-5000is about 4 hours with the lamp being switched off.
  3. When charging is complete, replace the anti-dust cap to ensure the waterproof and dustproof ability.
  4. Recharge a stored headlamp every four months to maintain optimal Li-ion battery performance.
  5. When charging, the Med output level of General mode can be used. The headlamp will not automatically power on after full charging.

Battery Level Indication
With the lamp switched off, single click the switch to check the battery status, the indicator 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-L21-5000 battery.

Intelligent Overheat Protection
The lamp will accumulate a lot of heat when used at relatively high output levels for extended periods. When the lamp reaches a temperature of 65°C or above, the lamp will automatically step down a few lumens to reduce the temperature. When the temperature drops below 65°C, it will then allow the user for the reselection of the modes.

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

Note: This only works with Fenix ARB-L21-5000 battery.

Headband Assembly

  1. The headband is factory assembled by default.
  2. Adjust the headband by sliding the buckle to the required length.

Usage and Maintenance for the Fenix HM70R Rechargeable Headlamp

  • Disassembling the sealed head can cause damage to the lamp and will void the warranty.
  • Fenix recommends using an excellent quality Fenix battery.
  • If the lamp will not be used for an extended period, remove the battery, or the lamp could be damaged by electrolyte leakage.
  • Loosen the cap or take out the battery to prevent accidental activation during storage or transportation.
  • 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 the battery (Ensure battery is inserted according to the manufacturer’s specifications).
    B: The contact point or contact of the battery or headlamp is dirty.
    Solution: Clean the contact points with a cotton swab soaked in rubbing alcohol.If the above methods don’t work, please contact the distributor.


  • The headlamp is a high-intensity lighting device capable of causing eye damage to the user or others. Avoid shining the lamp directly into anyone’s eyes.
  • This headlamp will accumulate a lot of heat when used for extended periods, resulting in a high temperature of the headlamp Pay attention to safe use to avoid scalding.
  • The LED of this headlamp is not replaceable; so the entire lamp should be replaced when the LED reaches the end of its life.
  • All information provided in this manual is subject to change without prior notice.

40 reviews for Fenix HM70R Rechargeable Headlamp

Based on 40 reviews
  1. Todd Green (verified owner)

    Very happy with your product

    (0) (0)
  2. John B. (verified owner)

    The real deal! Super bright light.
    Flood or spot…..if it’s not enough, better wait for the sun to rise!

    (0) (0)
  3. grandma (verified owner)

    Only used one day, but it is fantastic. Switched all my lights (headlamp, bike headlight, bike taillight) to Fenix products. Thoughts:
    + One huge, simple, responsive button for all functions. Previously had a Black Diamond head lamp before and there were so many functions (red/blue/green/flood light/spot light/intensity/lock) tied to an unresponsive, mushy button. I always had to stop and think what secret series of presses will lead me from one mode into another. This Fenix is so intuitive.
    + USB-C charging (even C2C, which a lot of manufacturers apparently fail to implement)
    + Headband is really comfortable (non slip silicone strip, reflective, stretchy, top band). Thought heavier weight would make it a bad running light. The top band does a great job managing weight distribution so it’s not a problem for running short to medium distances. Like he grey and orange headband contrast, which makes it easy to find on both light and dark surfaces.
    + Metal feels so much nicer to use than the usual plastic on headlamps
    + Perfect set of options (flood, spot, red, lock, dim to extremely bright). No flashing or colors or other fluff to needlessly cycle through.
    + Screw cap closures for charge port and battery are robust. Other lights use some silicone flap that tears off after 2 years and are spongy, so you can’t always feel that it’s closed without looking (so more at risk of moisture).
    + When you long press, the light remembers your spotlight intensity. When you double press, the light does not remember your floodlight/red light selection. I first thought they forgot to add memory to the double press. But since it starts in red light, and does not have memory, it means you’ll never double press and get a white floodlight that kills your night vision. Such a thoughtful touch.

    – Would like option to simultaneously use both flood light for close distance work and spotlight for long distance work.
    – Would like easier way to add/remove headband. I use this both for running (with headband) and for cycling (without headband but with helmet attachment). Swapping the headband takes a couple minutes each time.
    – Light seems to not always charge. Last night used it for running ~45 minutes, came back, charged it, but charger was green indicating fully charged, not the expected red charge indicator.
    – Little concerned that the plastic nub that allows for angle adjusting will wear off over time. Happy that the product has a lifetime warranty so may not be an issue.

    (1) (0)
    • Dianne (store manager)

      I have asked warranty to reach out to you to discuss the charging to see if there is something going on.

  4. [email protected] (verified owner)

    I purchased this headlamp for the increased capability of the 21700 battery over the 18650 battery… I’ve been a huge fan of the HL60R after several years of flawless performance in all conditions… So I was very excited to put this headlamp to use in much the same way as the HL60R… So far this light has performed perfectly…
    Fenix has been my favorite brand because its products have exceeded my expectations time and again… I’ve had many people ask about my Fenix lights after witnessing the superior performance of my lights over their lights…

    (0) (0)
  5. Ryan Gookstetter (verified owner)

    Best addition to my backpacking gear in awhile

    (0) (0)
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