Single click the switch with the light switched off and the battery status LEDs will indicate the current battery level with illumination lasting for 3 seconds.
100% – 85%
Green Constant-On
85% – 50%
Green Flashing
50% – 25%
Red Constant-On
25% – 1%
Red Flashing
Note: Power indicator function only available with Fenix ARB-L21 rechargeable li-ion batteries.