CJMCU-2557 schematics explained?

[martinius96]

Hello, this user provides schematics for CJMCU-2557 board that is based on BQ25570 energy harvesting chip from Texas Instruments. CJMCU looks like no more working, like their website, but modules are still available on Aliexpress.

About the scheme:
Which of these capacitors used is 0,22F supercap that is used on this board?
I don't know it is C3 marked as value 220 or C5 marked as 22UUF? Or isn't it present in schematics?

Also, I think there can be used connection between some pins to disconnect battery if it is too low, or is it already solved on that board. Am I right? Also a bit to explain how it works, and if in reality it can turn on from 330 mV due the supercapacitor? As standardly schematics of BQ25570 says, it starts from 600 mV, but in older revisions of the chip it says 330 mV. So I don't know if supercap here has some advantage in terms of cold-start voltage.

Thanks

Scheme: https://github.com/Edragon/Datasheet/blob/master/TI/CJMCU-2557.pdf