LOLIN C3 Pico is a tiny ESP32-C3 board with battery charging support
LOLIN C3 Pico is a tiny (25.4×25.4mm) ESP32-C3 RISC-V board with 2.4 GHz WiFi and Bluetooth Low Energy connectivity, a few I/Os, and LiPo battery support including charging circuitry.
I tend to like Wemos/LOLIN boards, because of their small form factor, support for equally tiny shields, and low price. The LOLIN C3 Pico is no exception, and even adds a few features such as an RGB LED, an I2C connector, and support for battery power and charging.
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The board ships with MicroPython firmware, but also support Arduino, CircuitPython, and ESP-IDF programming. Documentation and basic instructions to get started can be found on the wiki.