I just recently got into the eRoll. It's a little bitty battery (90mah), but it has a 1000 mah pcc (personal charging case) with it, in the kit. In the kit, you get....2 batteries, 2 atomizers, 1 (sometimes 2) cones, 3 cartidges, pcc, charging cable, wall plug.
You treat the battery like a cigarette. When you are done with your vaping session, you put it back into the pcc, for the next time. It consists of the battery, an ego c type A atomizer, an atomizer cone, and a 1/2 ml tank/cartridge. The battery can last up to an hour of my vaping (moderate to heavy), but it's not meant to be used that way and is harder on the battery. I've only had it for a few days, so can't tell you about long term, but I have not used any of my other batteries since I got the kit on Tuesday. It is a 3.7 regulated battery, and hits as good as, if not better than the regulated mini ego batteries that I have.
Here are some people's complaints (besides battery life).....
.....small tank size - I plan on taking filled extras or a needle nosed bottle for refilling
.....needing a needle nosed bottle for refilling - there is a removable plug on the cart, so is not really necessary
.....no storage for extras in the pcc
I'm sure I've forgotten something. Here's the link that talks about everything
http://www.e-cigarette-forum.com/forum/general-e-smoking-discussion/340059-joyetech-eroll.html
My opinion is, I LOVE IT. I got it because I wanted to decrease my pacifier time. It seems to be doing the trick. I feel like I'm smoking again (forgot, that was another complaint someone had). Take it out of the pack, vape for a few minutes, put it back into the pack. I'm one of those that started vaping due to health problems starting, or I'd still be on cigarettes.
Here's where you can get the kits......
JOYE eRoll Parts : Rocky Mountain Vapor, The Mountain top of Electronic Cigarettes Use coupon code 20rocky and get 20% off.
Sorry, I wrote a book. I get excited talking about my new toys, and gotta spread the word.