I know a lot of people say that you shouldn't discharge below 3.5V. I have a dual parallel 18650 mech mod which when fully charged reads 4.1V on the volt metre. But when I add the rda(.24 Ohm dual clapton build) on the volt metre and fire, it goes down to 3.3V. and when I remove the rda it goes back up to 4.1V. So I wanted to know should i be keeping an eye on the voltage when the RDA is connected or Without the RDA in terms of when to recharge the batteries?