I basically asked the same thing a week ago. like 3.5v. imr could go lower but shortens it's life. icr not really safe. if it goes till it shuts off like 2.5v discard the battery. do not attempt to charge it again. or do so at your own risk. you will notice it drops below 3.5 because vapor production should be greatly reduced. unless you are using a carto/clearo. like a pro tank or nautilus. then you just need to get to know the battery. easiest way to do this is by ml. if I use a 1600 imr I change it every 10 ml of heavy vaping.
I change out my battery when I feel a drop off in vapor intensity, usually around 3.6-3.8. A fully charged 18650 reads 4.1-4.2 even though it's technically a 3.7 battery. I also only use mechanical mods.
I check my batteries all the time with a dmm. Cheap and just plain old good practice imho. I drain them till they drop just below 3.7 but don't let them go below 3.6
On my mechanicals, I can tell when it's time for a battery change, by the reduction in vapor. When I pull the battery out and check it, it's usually around 3.6-3.7.
Until you get a feel for your battery charge state, check the voltage occasionally while you're vaping. As others have stated, eventually you'll know when it's time to put a fresh battery in because the quality of your vape will change.
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