Yesterday, my istick lasted about 5 hours with my Orchid on it with a 1.1 coil, running about 9.5w. I got home around 6pm and plugged the almost dead istick (turned off) into a wall charger. It's the little white brick shaped adapter that charges my iphone, with the micro usb that came with the device. I left it charging for about two hours, then pulled it off and vaped till bedtime. That was about 4 hours, from coming off the charger to light's out, vaping fairly heavily, using an old T3S tank with a 2.1 coil because right now I'm so annoyed with every other tank I own that I could post a whole other thread about it. This morning, we left the house and did some errands and driving around, and I vaped fairly heavily because being in the car is a big "smoking trigger" for me. About 4pm, the istick died deader than dead. I did this on purpose
I'd never run it all the way down before so I wanted to see how long it would take. By my math
I got about 10 hours of vaping life off the thing. Using a 2.1 coil, about 5-7 second puffs, set at 3.9v, I felt like I could literally watch the battery icon move when I was vaping. Better than most of my old eGo batteries, nothing like my MVP or the two days worth of heavy vaping that some people seem to be getting.
BUT
because I am a dummy, I did not realize that when the istick is fully charged, the battery icon goes away on the screen. So, it is pretty likely that mine has NEVER had a full charge.

So I'm guessing that my lacking battery life might be due to user error. I've got it plugged in now and am not taking it off until the battery icon disappears. Then I'm going to see how long I get off of it. I also ordered two more from eciggity today. Because I want to see if it is possible that my first one is wonky and others might have higher battery life. And because overall I LOVE the istick. It is a great design, it feels good to hold, it doesn't feel like a brick in my purse like my MVP does, and if I have a few to swap out I feel like that is a pretty good way to meet my vaping needs. I don't want to blow clouds, I don't want or need 50+watts
I just want something simple that works so I can vape and get on with my day. NOW if I could just find a tank to put on the darn thing that holds enough juice, doesn't spit, doesn't gurgle, doesn't taste burnt when chain-vaping, and doesn't have the BVC funk that puts me off my juice...