@rpunkt if 3ma is your current draw while sleeping, you will quickly drain any battery or supercap. The "mini boost buck dc board" itself has a no-load current of 1.77mA.

Might look here for low-power libraries and design considerations:

http://www.home-automation-community.com/arduino-low-power-how-to-run-atmega328p-for-a-year-on-coin-cell-battery/

https://github.com/rocketscream/Low-Power

@sergio-ramos Did you have an issue with one? I have purchased many of them and have not had one problem.

Thanks, I'll check out that library as well.

After four days of operating on a 18650 battery, the battery voltage hasn't dropped from full charge voltage of 4.12v. I was quite pleased with the nrf24 range of these ElectroDragon boards as well.

I received my order of these nrf24duinos and loaded up a Nodemanger BME280 sketch. Currently running on a battery and waking up every 10 minutes.

I installed the spiflash.h library, added the "SPIFlash flash(8);" but flash.powerDown(); throws the an error during compilation "class SPIFlash has no member named 'powerDown".

I opened the spiflash.h library and no powerDown defined. I did see sleep() though.

I am considering ordering several of these for new and future sensors. I thought I saw this board supported by myscontroller bootloader in 13pre or the github dev branch but cant seem to find it at the moment.

Has anyone tried this FOTA?

--Reichard