although I'm quite new to Rpi I have some knowledge with electronics in general. I need to run my Rpi ZERO by one 3.7 V lithium cell. Since voltages needed for Rpi ZERO are generated from 5V USB input by integrated circuit PAM2306 on board itself, and PAM2306 datasheet says that input can be from 2.5 to 5.5 V, can I just desolder USB micro connector and replace it with direct CABLE way to Li-Ion cell? As I see it from schematics (https://www.raspberrypi.org/documentati ... matics.pdf) it would not be a problem, right? All I lost during this are GPIO pins 2 and 4 because they use the 5 V input directly. That is totally not a problem for me since I'm not about to use them. Also HDMI output use 5V but again, I have no use for it (will use TV output anyway).
Anyway, there can be same reason blocking this approach I don't yet realized. What do you think?