More good news from the Anduril thread, especially for “blinkers” : there is Low Voltage Protection specifically for the aux and button LED. LVP means at 2.8 V the aux/button LED should turn off.
Note that for lights with single-color aux LED like this Wurkkos TS21, the protection is for blinking mode only, NOT dim mode (strange isn’t it?).
I don’t have a chance to test yet, but if you have any battery that dips to 2.8 v level please check to see if it works.
SammysHP:
Yes, multi color LEDs are safe and single color in Anduril 2 if you use the blinking mode.