Sorry if this has been posted before, but I can't find it. You would think that the manufacturers of these mods with the oled screen could include a cute lil battery level readout instead of just giving you the battery voltage. It's my understanding that when a single 18650 drops to 3.6 volts it's time to recharge. Can anyone tell me at what voltage level it is time to recharge a single 18350 in order to avoid over draining it? Thanks.
