Robuta

https://www.adafruit.com/product/2124

Adafruit LiIon/LiPoly Backpack Add-On for Pro Trinket/ItsyBitsy : Adafruit Industries, Unique &...

Adafruit Industries, Unique & fun DIY electronics and kits : -

add on adafruit liion lipoly backpack

https://www.adafruit.com/product/5580

Adafruit MAX17048 LiPoly / LiIon Fuel Gauge and Battery Monitor [STEMMA JST PH & QT / Qwiic] :...

Adafruit Industries, Unique & fun DIY electronics and kits : -

fuel gauge adafruit lipoly liion battery

https://www.adafruit.com/product/1304

Adafruit Micro Lipo - USB LiIon/LiPoly charger [v2] : Adafruit Industries, Unique & fun DIY...

Adafruit Industries, Unique & fun DIY electronics and kits : -

adafruit micro lipo usb liion