2 layers25.7 × 21 mm

Esp pmc
ldab/esp-battery-pmb
ESP32, ESP8266 and the likes Battery Management Board, Power your device with a single Battery or 2xAAA. With a buit-in Boost and Buck converter + Nano Timer - Sleep Current < 1uA.
27 parts1MIT
KiCad boards from 2 GitHub repositories tagged “boost”, the most starred first; open any of them in PCBKit.

ldab/esp-battery-pmb
ESP32, ESP8266 and the likes Battery Management Board, Power your device with a single Battery or 2xAAA. With a buit-in Boost and Buck converter + Nano Timer - Sleep Current < 1uA.
