Datasheet

there's no way to disable the charger

Do not use 7.4V RC batteries on the battery port - this will destroy the board

The Feather

is not designed for external power supplies

- this is a design decision to make the board compact and low

cost. It is not recommended, but technically possible:

Connect an external 3.3V power supply to the 3V and GND pins. Not recommended, this may cause unexpected

behavior and the EN pin will no longer. Also this doesn't provide power on BAT or USB and some

Feathers/Wings use those pins for high current usages. You may end up damaging your Feather.

Connect an external 5V power supply to the USB and GND pins. Not recommended, this may cause unexpected

behavior when plugging in the USB port because you will be back-powering the USB port, which

could

confuse

or damage your computer.