Hi Lorenzo - maybe you could ask RAK themselves?
Without anything running (eg. just after boot), Espruino should manage around 20uA from the nRF52832 chip (0.02mA), and with NRF.sleep(); Espruino should do 3uA.
So the increased power draw will likely be from the circuitry around the nRF52832, but I don't know enough about RAK's design to be able to help you out properly.
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