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Power Pins
Both ItsyBitsy 32u4's have BAT G USB on the top left, right next to the micro USB port
These pins are:
BAT - battery input for an alternative power source to USB.
On the 5V itsy, this pin can be 5.5-16VDC
© Adafruit Industries
Which do you have?
Look in the middle of the board, you'll see either 32u4
3V 8MHz or 32u4 5V 16 MHz
https://learn.adafruit.com/introducting-itsy-bitsy-32u4
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