I was always interested in knowing at which voltage the protection trips. Protected LiIon cells? All I possess are some Ultrafire 10440's, these Trustfire 14500's, and 2 cells of XTAR 18650's. I've used the Ultrafire and Trustfire cells EXCESSIVELY for runtime tests for BLF posts. in my most recent 10440's test with iTP A3 XP-G R5, i measured 2.653V, and today i happened to measure 2.627V with these Trustfire 14500's.
How did i measure it?
the cell was in my Xeno E03 XML on Ultralow Mode. When the light shut off due to the cell's tripped protection, i quickly took out the cell and placed it in my charger for 1.0 second. After that (again quickly) i measured the voltage. And there it was: 2.627V.
Now we know it.
While common advice on forums is "Dont let your liions discharge below the 3.6V mark", in reality the cell manufacturers dont let the protection trip until the nominal 2.75V mark. With slow discharge currents (e.g. in ultralow mode), this mark is even undershot (2.627V in Xeno, 2.653V in iTP A3, both in Low mode).
good info. i know. thanks.
haha