i too was frustrated by cheaper batteries performance and moved to an i-taste svd.i still use it but moved on to mechanical mods (with standard resistance coils) and invested in a good charger, the best batteries (thanks Batitude) and began learning the finer points of vaping. research is your best friend right now before you make another purchase. best of luck in your search...
I've been taking a good long look at the information on mechanical mods. I do physical work and it seems like those are the things to have in your pocket that aren't going to break. I've been on vacation since I started vaping and am still until late next week, so I guess I will see how my EVOD handles a work day and then make a decision.