bapgood. He has a 6400mAh 90a continous lipo battery in his custom SX350 mod. He should be able to tell you how bypass mode compares to a mechanical mod. I'm curious as well. But I'm pretty sure stacked batteries won't operate the chip at all.
@bapgood How well does your 90a lipo SX350 compare to mechanical mods when sub ohming to the point where it pulls well over 35w from the battery?