Power Management; Battery + Usb Power - Adafruit ESP32-S3 Manual

Power Management

Battery + USB Power

We wanted to make our Feather boards easy to power both when connected to a
computer as well as via battery.
There's two ways to power a Feather:
1. You can connect with a USB cable (just plug into the jack) and the Feather will
regulate the 5V USB down to 3.3V.
2. You can also connect a 4.2/3.7V Lithium Polymer (LiPo/LiPoly) or Lithium Ion
(LiIon) battery to the JST jack. This will let the Feather run on a rechargeable
battery.
When the USB power is powered, it will automatically switch over to USB for power,
as well as start charging the battery (if attached). This happens 'hot-swap' style so you
can always keep the LiPoly connected as a 'backup' power that will only get used
when USB power is lost.
The JST connector polarity is matched to Adafruit LiPoly batteries. Using wrong
polarity batteries can destroy your Feather.
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