I picked up the eGo-c Vision kit and a F-16 tank. I was told that the tank center was cheaper than replacing the Vision clearomizers. The clearomizers are good but the cost moved me to the larger tank. I've found through trail and error that when refilling I fill the tank and put the top back on just to form a seal then turn it to the side and finish pushing the cap on. I found that doing this prevents leaking out the bottom of the tank. I guess this is because when you put the top on with the liquid at the bottom of the tank it forces the liquid out. My battery lasted two days with the clearomizers and only about a day and a half with the tank on. Being that I'm new to this (steady for two weeks with no other smokey treats) I just want to know if there's something better and are there bigger batteries that last longer. Now I'm fine with what I've got just wondering if there's something better.