I just did a test to see what I can get out of a battery.
I did 15 sec cycles (so click on, heating, draw, click off is 15 sec this means 12 second draws,
drawing pretty hard)
I got a total of 20 draws this way, meaning 5 minute total battery life.
3 on 3, 6 on 3.5, 2 on 4, 5 on 4.5 and 4 on 5...