I think the PureSmokers Ace (KR808D-1) cartomizer vape better at 3.7v anything higher then that will literally cook the juice in the (KR808D-1) cartomizer and will dry up quicker so i've notice. I wish that steve would some how have the option of a 3.7v battery the would fit in the v2 am sure their are others out their who are thinking the same way as me. On certian atomizers like the 510 seem to vape better at 3.7v i think 5v is a little too harsh on the 510 and certain other atomizers that's my opinion..
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