The way I see it if you like the battery life on the small batts, by all means get another. But really you won't find much difference in vapor or anything else unless you try different cartos. The only main difference would be a 510 at 3.2 volts regulated, and a kr808 at 3.7 unregulated. All the diff names really mean squat. I would get an ego kit with 900-1000mah bats, with a 5 button off/on feature, and also a passthrough feature. Or go variable voltage mod which you could find for $100. I have a couple epowers and provari, and maxi roughstack, 808 bats, a joker av, ect... but I find I like the 1000mah ego passthrough battery with a 2.6-2.8 ohm xl ce2 clearomizer and use it much more than any other devices. For me the tried and true ego is the best for a good price.
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