Long battery life for ESP32

[pekkin]

Hello, Experts.

I would like to run ESP32 for 48 hours and I understand that it depends on operating mode.
Briefly about it :
1)SPI read for approximately 48 hours
2)No data transfer by Wi-Fi
3)Write data on SLC NAND memory module

Could you help me to calculate the minimum battery capacity, please? Or share the links with similar information?
Thanks!

[tommeyers]

Begin by measuring the current in each of the states you listed with time in each state.

Post your results.

[boarchuz]

What is the interval between SPI/flash activity? That will determine if/which sleep modes are viable.
If you wanted to be very aggressive about it, you might even use the ULP to bitbang SPI and buffer the received data, while the SoC wakes intermittently to write the data to flash when the buffer is full.