I got high drain 14500s with my Wetbox and while they're a huge improvement over the RN4081 batteries, they don't last as long as I expected. I was reading posts where people were claiming things like "12 hours of HEAVY vaping" and "I change mine every 2 or 3 days", etc. Personally, I am a moderate-to-heavy vaper (not much during the day, but I use it like a pacifier at night) and I burn through both of my batteries in a day. The one I use in my Wetbox hits the charger as soon as I get home. The other get charged when I get to work the next day. All-in-all, I suspect I am averaging about 6 hours from each battery. AND I am using regular (not LR) 510 cartos. They're the high drain 600mAh 14500s manufactured for Nhaler.
I just picked up a couple of regular, gray Ultrafire 900mAh 14500 batteries from COV, which are charging as I type. I will be curious to see how they compare, especially in terms of how long they hold a charge.