I've tried lots of clearomisers and other tank types but I always go back to the iclear 16 type that fits on these batteries as they just give the best cigarette-like experience (ex-smoker who was finally able to give up because of the invention of vaping) I like batteries that are slim and easy to carry around in a pocket etc. and don't have a lot of fancy features that just complicate matters. It's getting harder to find them. I vape a LOT and tend to buy two at a time to have one on charge at home and one with me. Bought the 650mAh ones at first but found myself having to carry around a charged spare all the time as they don't last too long for me. Then Ttried the 1100mAh and they were great! They last me at least all day once fully charged. They last about a year before the battery starts to lose performance and they need replacing. I have since replaced them with the same model a couple of times now.