This is awesome I think I have all the components on hand.Below is the LTspice simulation of a circuit that will cut off the output at its set voltage.
It uses a TLV431 (not TL431) low power voltage reference as a comparator controlling a P-MOSFET switch.
It switches when the Ref voltage equals 1.24V, as determined by the voltage divider consisting of U2 and R3.
Pot U2 can be adjusted to get the desired cutoff voltage for the particular battery you have (set for 3V in the simulation).
The P-MOSFET must be a logic-level device that can fully turn on at a Vgs of -3V.
View attachment 167521
OK as I re-read there post a few times, I started to think that it had the module in it. But some times you need another set of eyes to assist you. On another note I think it would be in a good form to build YOUR circuit to "have in my pocket" in case I come across a case where there is not a module built in. So again thank you for that.It does appear to have it built in, so you shouldn't need the circuit I posted.
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by Steve Arar