I don't recall SI ever stating their batteries were 5V regulated down to 3.x~ish, though they do state that for their regulated PT unit.
One of their batteries is actually disassembled at home right now but I unpacked the battery before reading it (meaning, I opened the foil packet - I was thinking it might be multiple cells, but turns out it's a single cell with the layers rolled up into a cylinder). There might be another auto that I've killed though, so maybe I can take that apart and do an actual reading. My guess is that it's closer to 4.2V than 5V but that's only a guess. I do know that the only electronics in there are on a small board at the bottom containing the LED and pressure sensor. It's not big, so I assume the regulation is a very simple zener/resistor circuit.
If so, while it does regulate voltage it's not going to be exceedingly precise and I don't see why it would have to be given what it is. If it's in the ball park and makes for a more consistent vaping experience with their gear it's still a good thing.
One of their batteries is actually disassembled at home right now but I unpacked the battery before reading it (meaning, I opened the foil packet - I was thinking it might be multiple cells, but turns out it's a single cell with the layers rolled up into a cylinder). There might be another auto that I've killed though, so maybe I can take that apart and do an actual reading. My guess is that it's closer to 4.2V than 5V but that's only a guess. I do know that the only electronics in there are on a small board at the bottom containing the LED and pressure sensor. It's not big, so I assume the regulation is a very simple zener/resistor circuit.
If so, while it does regulate voltage it's not going to be exceedingly precise and I don't see why it would have to be given what it is. If it's in the ball park and makes for a more consistent vaping experience with their gear it's still a good thing.