In article ,
Martin Gregorie   wrote:
>Has anybody tried running a Pi Zero from a single LiPO cell such as you'd
>use in a RC model aircraft or a drone? The voltage varies with charge
>from 4.2 v down to about 3.7 v
>
>I think it should work since the Pi has a regulator that drops the 5v
>supply voltage to 3.3 for internal use, but I don't know what minimum
>voltage the internal regulator needs to work correctly.

There are bits inside te Pi still need that 5v supply - RAM, HDMI, USB ...

I use the little Adafruit 1000C units with LiPo's. I power a Pi Zero
that's running ~80 multiplexed LEDs plus wi-fi from a 2700mAh cell for
about 7 hours.

See e.g.
https://shop.pimoroni.com/products/powerboost-1000-charger-rechargeable-5v-lipo
-usb-boost-1a-1000c

It can charge and run at the same time and there is a digital output
you can hook into the Pi to give you a low battery indicator.

-Gordon

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