Never even thought of that.
not really a problem.. it is not necessary to open an HDS to measure battery voltage, we can just rely on the double blinks described in the manual:
"Your flashlight will double-blink once every two minutes to remind you that the battery needs to be changed when the battery is no longer capable of maintaining a 50 lumen output level."
I kind of like the ability to get around low voltage protection.
for that scenario
what follows is unverified speculation:
(Trust but Verify)
I think the double blinking and 50 lumen limit, starts when the LiIon battery drops below 3.3V..(entering CR123 Voltage range)...
this means that if we intentionally Want to sacrifice the LiIon battery in an emergency, we can disable the LiIon LVP, and the 50 lumen limit, when the double blinks start.
By doing a battery detect reset: (unscrew the body while the light is on, then screw it back together with the depleted LiIon still inside)
per the manual:
"The simplest way to perform a reset is to turn on your flashlight (with the button released) and open the battery compartment until your flashlight turns off and then replace the battery compartment. "
The light would then think the depleted LiIon is a fresh CR123.
That means the output limit would go back up to maximum, and the double blinks, and 50 lumen limit, and the LiIon LVP would all be disabled.
end unverified speculation ;-)