the kgo comes off the charger @4.2v and runs @3.7 most of the way. you will notice a small drop off little before battery goes dead. version 1 kgo's are very very good.....the v2 hoosierecig is selling has given me nothing but problems. the "slight improvement" that someone mentioned...im suspecting that they have not tried the v2.
i had mine replaced because i thought it was faulty, turns out it wasnt. (all 4 batteries acted the same way) if you take drags longer than 4 seconds, the light will start blinking and it turns off. you have to do a 5 click operation to get it going again, only to blink 5 more times few puffs later.
until you actually HAVE used up the whole battery, mine requires me to do the 5 click operation about 20 times. kinda annoying. the version 1 (which they dont sell anymore) never had this problem, ran strong for over a year. why they have to mess with a good thing is beyond me.
how do you know what version it is?