I have coils between 2.4 and 2.8. I have two 3400 mah's charged and waiting for my Vamo. Some days I am sucking on my binkie all day, others I might go an hour or two without. What'd be my range? Should I just coax the last of the battery life out of my two twists in the transition, or hold them back fully charged for emergencies?Heh. My 3400 mah lasts me about a day.