What kind of coils are those. I’ve found that for me, with larger coils in a dual coil atty, the ramp up with a single battery takes forever (but I am an impatient type of person) and the vapor craps out too fast. I’ve found even with a single coil reasonable fused Clapton, not giant, coming in. 0.3 ohm, it poops out for me above 3.5V, closer to 3.6. With the single coils I use from simple round to a fused with small cores, I generally get maybe a bottle of juice, 6-8 ml depending on bottle, and am ready for battery change. It usually comes out at 3.7-3.8V.
One time out of curiosity I ran a single battery down until not only was the cape cold, but not much vapor period and I was at 3.4V. I just find that for a single battery mech big builds are better off, for me, on a regulated mod I can heat the coil up quickly with, and run the battery down but still have a nice vape. With the mechs I like my little 22 mm single coils that heat right up and stay nice and pretty consistent until the squonk bottle is empty.
I’ve been enjoying my Redemption. I found if I close the air about a third closed, raise the coils up a tad, there’s lots of cloud but surprisingly good flavor for a big dual coil build. That and the Unicorn are my favorite dual coils right now, trailed very close by the Reload X. All my other dual coils don’t keep up with them. Probably should just box them for the stash at this point and empty out my atty rack and make more room.