Single Ni80 fused clapton around 0.18-0.2 with a P28, get a full bottle per battery - blue is full battery, blue/orange is about half way, orange only means it's getting low and it also has low battery cut-off so it'll flash orange and not fire once the battery is down to 3.3-3.2v.
It acts as a mech does in the sense it'll only put out whatever voltage is in the battery, so the output decreases as the battery power goes down, but from previous testing there's either a slight boost on the board or it has less voltage losses than a straight mech as it gives a wee touch more power with same atty/battery over a similar mech squonker (I tested using a Runt Arc with all silver contacts, same atty, same type/age of battery and the Aspire had a wee bit more oomph to it)
I'd suggest building slightly lower than your preference on a regulated mod, you'll get longer over the course of the battery of your preferred vape.
I haven't used the stock atty/coils, got three or four of them lying around but they just don't appeal to me.