Type
Dimensio
ns
Nominal
voltage
Usability
Fenix ARB-L18 Series
18650
3.6 V / 3.7V
Recommended √√
Non-rechargeable Battery
(Lithium)
CR123A
3V
Usable
√
Rechargeable Battery (LiFePO4)
16340
3.2V
Usable
√
Rechargeable Battery (LiFePO4)
18650
3.2V
Usable
√
Rechargeable Battery (Li-ion)
18650
3.6 V / 3.7V
Caution*
！
Rechargeable Battery (Li-ion)
16340
3.6 V / 3.7V
Banned
×
Warning: *18650 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 light head to insert the battery with the anode side (+) towards the light head, then
screw the light head back on.
Battery Level Indication
With the light switched off, single click the side 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-L18 Series 18650 rechargeable Li-ion battery.
Intelligent Overheat 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 60°C or above, the light will automatically step down a
few lumens to reduce the temperature. When the temperature drops below 60°C, it will then allow
the user for the reselection of Turbo mode.
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
battery level indicator blinks red to remind you to timely recharge or replace the battery.
Note: This only works with Fenix ARB-L18 18650 Li-ion battery.
Usage and Maintenance
