I have the series 4 with 74% battery health. Usually have it all day and it lasts the whole day for me, including jogs and workouts. I just charge it at night. That being said it’s WiFi only and I have it notifications set to only iMessage and calls.
I use my Apple 8"s for health and sleep stats. One for daytime with a more rugged protective band. The other for night time, so charging is not a worry. Still using old Fitbit charge 4 under sock above ankle for accurate steps/miles. Don't update to Apple 9 or Ultra 3, as of Jan 2024 their oxygen sensors are disabled.
