Lowest power (battery compatible) breakout board for LoRa and ESP32 or ARM processors

[bluejedi]

@ecosoph

I’ve searched a lot for the most efficient lora boards that consume let’s say below 100µA in deep sleep and also read carefull through this topic:

Big ESP32 + SX127x topic part 3

However, when I have tried the TTGO or Heltec boards, I’ve had deep sleep currents of 12mA or 2mA respectively.

You may have missed this:

Is there a ESP32 LoRaWAN board for battery operation?

If you want very low power consumption during deep sleep (in the uA range), then most of the current ESP32 LoRa boards will not be suitable for that (at all). You may try a Heltec Wireless Stick Lite. It has an advertised deep sleep current of 30 uA. (I don’t have personal experience with this board.) Another possible option may be the TTGO T-Beam V1.0 (the most recent version). It uses a special power management chip that can enable/disable power for parts of the board. I am not aware of it…

@ecosoph

This one seems super interesting to me:
3. Heltec cubecell with arm processor:

Above post also mentions Heltec CubeCell, which is further detailed in its own topic:

Heltec CubeCell - part 1
Heltec CubeCell - part 2