Here is a tried and tested sample circuit of a Li-Ion battery charger that can be used to charge any 3.7V Li-Ion battery using a 5VDC (USB, Solar Panel…) power supply. At the heart of the circuit is ...

The ESP32-S3 Plus features two CPU cores that run at up to 240 MHz and integrated support for WiFi 4 and Bluetooth 5.0 LE.