I'm testing the board with Esphome, I had the same problem before, when i choose the battery capacity, I have this situation

21:53:07
[W]
[component:237]
Component powerfeather_mainboard took a long time for an operation (56 ms).
21:53:07
[W]
[component:238]
Also I have this warning on webpage
Components should block for at most 30 ms.