As I've detailed here, some models of Pi can be operated from a power supply as low as 3.3 volts. So, I've decided to build a minimum-cost battery operated Pi Zero.

I'll need the battery of course, and it should have a protection module: I don't want any fires. And a power switch of some kind. I'll also need some way to charge the battery. And before you say anything, an all-in-one charging-protection-boost module is cheating!

The downside of this setup (there's always one, isn't there) is that some USB devices won't work at 3.3 volts. But my WiFi adapter certainly will, so I plan to make a battery operated access point as a test case.

Let the hack begin!