I spent two years with cig-alikes, I had to take seven with me everyday to work, construction. On average I would drop three a week, they were junk after that, and each lasted around 3-4hrs a day. Working 12hr days, I had a lot of charging to do!
Anymore, I refuse to buy anything with an internal battery, why throw away a $40 mod because a $7 battery died?
I can piece together a mech mod with an 18350 battery that will be smaller, lighter and run about as long as your Efog kit.
I've got double and triple 18650 battery regulated mods that run for three days.
I can take what I have and create what suits my needs for the day or the weekend.
Most all of my atomizers are rebuildable and I make my own coils.
So I just can't understand why you want to limit yourself so much. I get you like what you like, believe me! I fought and fought against the sub-ohm movement harder than anyone! At the time the batteries weren't that good and no one cared to learn battery safety!
But if you'd watch some videos, put in a little effort, get a Kayfun lite, build your own coils and get a decent mod, you'd be so much happier with vaping. With the current trend, I don't care to even guess how much longer you will be able to buy the coils you want so badly.