I've been vaping all day on my Ego twist and Boge 2.0 cartomizer and I just ran out of charge,So I started to use my backup which I set it to the same volts and it immediately produced more vape.There could be a few factors involved here either it could be that it does weaken prior to dying,or the charged twist is running w/ more power hotter at first then evens out.Or there are differences in the 2 twists,I don't know but is there anyone who does experience this using different twists??