SKY Battery Drop Out Voltage?

What is the SKY Battery Drop Out Voltage?

I’m down to 2.86V, Anker Alkaline, probably not the best choice for winter (although we have been unusually warm this year), but I had a pack and they have a good reputation for not leaking (they were on sale too):

(I have Lithiums in the AIR unit)

How low can the SKY voltage go while still maintaining proper operation?

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