Well I've owned it for 6 months on the original version ,with the understanding it was running on a single battery so I was building my coils accordingly to maximise my battery life . this week end I wanted to see if the latest firmware upgrade was worth it and it isn't let me tell you, before update I was vaping at 35w and averaging 450 to 485 puffs on the counter so not too bad, since upgrade same tank same coils same juice and fresh cotton and 245 on puff counter so I'll be going back to original version I only use it on power mode. Does anyone have an explanation or some kind of reasoning behind this drastic drop in battery life not bloody impress