I am currently working on a node with the CubeCell board and a BME280 to track THP every 15 min.
When it comes to the power supply, I tried a coin cell (CR2450 with 640mah). But it gave a battery voltage of 240 mv, and after a few messages it stopped working, so I assume the peak current was too high for the coin cell.
Coming to the LiPo option, since the sleep current is much higher and LiPos have a higher potential for failures (also fire), I wanted to stay away from that. Additionally, I am not sure which LiPo has a low self discharge current and want to use them inside, so solar panels are not an option.
This is why, I wanted to give a try with the coin cell.
Do you have other suggestions?