NanoCell ESP32 board


Battery-powered ESP32-C3 IoT board.


The NanoCell V2.1 is a development board built around the Espressif ESP32-C3 SoC (system-on-a-chip) preloaded with ESPHome firmware for low-power applications and improved Lithium battery management. The development board is a white printed circuit board with gold-plated contacts and a battery fuel-gauge IC, designed by Frapais’ lab in Greece.

As the name suggests, the NanoCell V2.1 is the latest in a series of iterations of ESP32-C3-based devices targeted at low-power applications. Compared to earlier versions, it offers a better user experience and improved power efficiency.

It features a buck-boost converter that reduces standby current consumption to 66uA (excluding the current consumed by the ESP32 module).


  • Microcontroller – ESP32-C3 RISC-V microcontroller @ 160MHz, with Wi-Fi and Bluetooth 5 (LE)
  • Battery Management
    • battery capacity measurement IC
    • Li-ion/Li-po battery charging & protection ICs
    • Accurate battery capacity measurement IC (MAX17048), accessible via I2C on pins 2 and 3.
  • USB – USB Type-C for charging and uploading firmware
  • Buttons – Reset and Boot
  • LEDs – Charging and USB power LED indicators
  • Breadboard-compatible pin headers break out all the pins of ESP32-C3, USB, battery, and VCC voltage.