Platine LilyPad – ATmega32U4 Board
Company: Arduino

LilyPad LED sewable
https://www.sparkfun.com/products/10081

To calculate the consumption of your circuit and if he needs to be in parallel or series your can use this calculator website: LED center


Lipo battery 3.7v 1200mAh/25C
AliExpress


Coin Cell Battery – 20mm (CR2032)


Coin Cell Battery Holder – 20mm (Sewable)