A deft sidestep 
Actually, during the day I'll normally run them until I notice vapor production going down (don't care if the LED flashes, since getting vapor is what counts to me). At night though it's nice to toss the second battery on the charger even if I've only used it an hour or so, so I start with two fully charged ones in the morning.
Actually, during the day I'll normally run them until I notice vapor production going down (don't care if the LED flashes, since getting vapor is what counts to me). At night though it's nice to toss the second battery on the charger even if I've only used it an hour or so, so I start with two fully charged ones in the morning.