Sorry for the provocative subject line. I was looking at using one of those integrated ESP32 + SX1276 + SSD1306 boards (there are a few that have popped up) in a battery powered application. I would like to be able to use the Wi-Fi / Bluetooth features and the LoraWAN features, but probably not at the same time or in the same application even.
I looked up all those part datasheets, and by my reading they should all operate down to 1.8V. Someone asked me, "could you just run it off of two AA batteries?" Let's not worry about questions of battery life for now, and treat that question as "is that a plausible thing to do without fundamentally compromising basic performance?"
Electrically, it seems plausible to wire battery power to the 3.3V header pin, bypassing the module regulators. But my gut said that radio performance might suffer from unregulated power, and that using a 1.8V regulator between the battery and board would be a better idea, but I wasn't satisfied with my confidence in giving that answer, which is what brought me here.
So what are the pros and cons of bringing a regulator to the party here?