Fenix E28R V2.0: How to Use, Charge & TroubleshootUpdated 7 days ago

How to operate, charge, and troubleshoot the Fenix E28R V2.0. Key specs: 1,700 lumens max, 273 m beam, USB-C rechargeable 18650, IP68. For the full mode-by-mode output and runtime table, the downloadable reference manual, and current price, see the Fenix E28R V2.0 product page.

Operating Instructions

On/Off: With the light unlocked, press and hold the side switch for 0.5 seconds to turn on/off the light.

Mode Switching: Mode A is General mode, Mode B is Flash (Strobe) mode, and Mode C is Warning light mode. From off, press and hold for 0.5 seconds to enter Mode A; press and hold 1.2 seconds from Mode A to enter Mode B; triple click from off to enter Mode C.

Output Selection: Mode A: single click to cycle Eco → Low → Med → High → Turbo. Mode C: single click to cycle Red constant-on → Green constant-on → Red breathing → Green breathing.

Intelligent Memory Circuit: Memorizes the last selected General Mode output, excluding Turbo; activates in High mode if switched off in Turbo.

Lock/Unlock: With the light off, double click the switch to lock (blinks twice in Eco); double click again to unlock and recall the previously used output.

Battery Specifications

Fenix ARB-L18 Series (18650, 3.6V): Recommended.
Non-rechargeable Lithium Battery (CR123A, 3.0V): Usable (no charging).
Rechargeable Li-ion Battery (18650, 3.6–3.7V): Caution.
Rechargeable Li-ion Battery (16340, 3.6–3.7V): Banned.
Rechargeable LiFePO4 Battery (16340 or 18650, 3.2V): Banned.

Battery Replacement: Unscrew the light body and insert the battery with the anode side (+) towards the light head, then screw the light body back on.

Charging

Turn off the light, open the anti-dust cover, and connect the USB Type-C end of the charging cable. The indicator displays red while charging and turns green when full. Only Eco and Low output can be used while charging. Normal charging time is about 3 hours with a 5V/2A adapter. Recharge a stored light every four months.

Battery Level Indication

Green on: saturated 100–85%. Green flashes: sufficient 85–50%. Red on: poor 50–25%. Red flashes: critical 25–1%. (Works only with a Fenix ARB-L18 Series battery.)

Intelligent Overheat Protection

At 60°C/140°F or above, the light automatically steps down output to reduce temperature, gradually recalling the standard output level as it cools.

Low-Voltage Warning

When voltage drops below the preset level, the flashlight downshifts until Eco is reached, then blinks red to prompt recharging. Works only with a Fenix ARB-L18 Series battery.

Troubleshooting

Light won't turn on: It may be locked. With the light off, double click the switch to unlock. If it still won't turn on, recharge the battery and check it is inserted with the positive (+) end toward the light head.
Flickers or turns on intermittently: Recharge or replace the battery, then clean the battery contacts with a cotton swab soaked in rubbing alcohol.
Brightness drops on its own during use: This is normal. The light steps down at 60°C/140°F to protect itself and recovers as it cools. It also downshifts when the battery runs low; recharge it.
Turbo, High or Med aren't available: While the light is charging, only Eco and Low can be used. Unplug it to use the higher outputs.
Charging or battery indicator doesn't respond: The charging and battery-level indicators only work with a Fenix ARB-L18 series battery. A CR123A battery can't be charged in the light.

If the above methods don't work, please contact Fenix Store support through live chat (the chat button on any page of fenix-store.com) or at [email protected].

Usage and Maintenance

Disassembling the sealed head can cause damage to the light and will void the warranty.
Fully charge the light in time to ensure normal function the next time it is needed.
Fenix recommends using an excellent quality battery.
If the light will not be used for an extended period, remove the battery to avoid damage from electrolyte leakage or battery explosion.
Long-term use can result in O-ring wear; replace with an approved spare to maintain a proper water seal.
Periodically clean the battery contacts with a cotton swab soaked in rubbing alcohol.

What's Included

Fenix E28R V2.0 flashlight, ARB-L18-3400 battery, USB Type-C charging cable, lanyard, spare O-ring, user manual, warranty card.

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