The supermini has a nrf52840 soc with 1MB of flash on board. It cost roughly 10€. The table below was just there to test the power draw of different hardware configurations.

Power draw uapsuResistorstateside
3500stockstocknormalleft
2500customstocknormalleft
605stockstockdeepsleepleft
665customstockdeepsleepleft
260stockstocknormalright
570stockstockdeepsleepright
120stockcustomnormal/typingright
100stockcustomnormalright
2.5stockcustomdeepsleepright
2500customcustomnormalleft
54customcustomdeepsleepleft
100customcustomnormalright
330customcustomnormalleft

Vcc battery 3.46V

Custom PSU xc6220 Custom resistor 10Mohm

Nice Nano

Power draw uapsuResistorstateside
380stockstocknormalleft

Modification

MACmod
C0:65:75:2E:8E:7Fpsu changed