4 layers100 × 75 mm

OpenAirScope
emertcakir/OpenAirScope
Open-source air quality and environmental monitoring node with STM32H743 + ESP32-C3, LoRaWAN, RS485, USB-C, Li-ion charging, and multi-sensor support.
282 parts26MIT
KiCad boards from 3 GitHub repositories tagged “lipo-battery”, the most starred first; open any of them in PCBKit.

emertcakir/OpenAirScope
Open-source air quality and environmental monitoring node with STM32H743 + ESP32-C3, LoRaWAN, RS485, USB-C, Li-ion charging, and multi-sensor support.

hnz1102/temp-logger
Logging Thermocouple Temperature and Send Data to InfluxDB system.

taguko/passive-lipo-balancer-nano
Passive LiPo cell balancer based on Arduino Nano.