Hi
Do you have any experience in powering Pisound with Li-ion batteries and boards / hats such as:
- Waveshare 18306 UPS HAT
https://www.waveshare.com/wiki/UPS_HAT - Seedstudio 114992299 UPS with RTC and Coulometer
https://www.seeedstudio.com/UPS-With-RTC-Coulometer-For-Raspberry-Pi-4B-3B-3B-p-4639.html
?