Thanks! IIRC it's a V2 because it has the RMS option.
I should clarify that the 100 ohm resistor is only in the circuit for a few seconds, after connecting the batteries but before turning on the Vamo board with five clicks. Once the board is going, it is connected directly to the batteries. Bucking the input through a linear regulator would kill the efficiency of the system and run super hot even if I could fit a parallel setup in there.
Linear regulators like the humble LM317, especially when stacked or used to drive a high-current transistor, make decent e-cig regulators. However, few things make them less desirable than something like an OKR-T/6. Running those regulators in parallel means going from a monolithic solution to a small circuit with discrete components. It's a pain in the ... to fit them on a small PCB and then another pain in the ... to fit all that in a mod. Also, linear regulators aren't very efficient as compared to switching regulators, so they kill batteries faster and are definitely going to run hot.
Would I make a linear regulator mod as a passthru? Absolutely. Space and power aren't really issues there. Would I make one into a battery mod? No freakin' way.
It's not a charging port. The mod can be used as a passthru on a USB hub, though it pulls the voltage down a lot, so the practical wattage limit on the mod is more like 9-10W in that case. At home, I use it with an ATX power supply which I turned into a bench supply. 5V regulated with plenty of current available.
