Hello all,
I want to introduce ESP32-S3 PowerFeather, a dev board that should make it a little easier to create solar + Li-ion/LiPo powered projects! It uses a charger IC that's smarter than most other similar boards: Texas Instruments BQ25628E; and also has an on-board LC709204F fuel gauge. Deep-sleep current can be under 20 uA. It has an Arduino/ESP-IDF SDK to help manage the use of the charger and fuel gauge, as well as the other power-related features. More details and link to documentation can be found on:
https://powerfeather.dev/.