@Nca78 Thanks you for you detailed answer.
The power source i am going to use is a CR2032. My bad, I overlooked the three RAW, VCC and GND connectors (yellow) on the power board site.
For my case, i think shout circuit of JPOWER will be a even better solution

If the "power" board is used, shall I keep the voltage regulator on Arduino? Without it, i think powering the board from RAW pin will not work.