I bought my watch in november 23. The battery was lasting like 10 days.
Suddenly, since february 24, I don’t know why but it doesn’t last more than 24 hours. I charge it to 100%, I go to sleep with it (no heart rate monitoring enabled, neither oxygen) and after 8 hours of sleeping, it went to 65%, with NO USE.
Sometimes it lasts less than 24 hours, and, with luck, it supports 48 hours.