I am a hybrid fan, always with the protuding 510 pin.
I run a 0.3ohm coil.
I only ever use 20700's and 21700's, I have 2 Golisi 21700's S35's, 3.7V, 3750mAh, 30A, a Sanyo T40 21700's, 4000mAh, 45A, 2 Sanyo 20700B's, 3.7V, 4250mAh, 15A and an iJoy 20700, 3.7V, 3000mAh, 40A.
I use them in various...