One question. The voltage keeps changing on my mod... Resistance is not changing, steady at 0.6, wattage set to 120, should be ~8.5 V... and sometimes shows 8.5 V... then drops to 6.0, 5.5 etc... Batteries are showing half charge, is this why? I'm on a Tesla 120, dual 18650 in series, Samsung 25r's... I'm well within the amp limit, this setup at accurate 8.5V pushes under 15 A (mod itself limits at 24A which is lower than the batteries' limit)... I'm new to super high power, I figure it's probably voltage drop & inability to boost enough but am I right? And if so, is this a flaw in the mod I've had less than 2 weeks and never taken over 70W til this coil, or is this normal with batt drain?