My first AW was a refurb S4 that arrived to me a year ago with like ~82% health, so it was a few years old when I got it, but still had day long battery. Eventually it dropped and is now 78% which means it will last all day as long as I don’t use it TOO much, but a workout or listening to music meant charging 2x a day. So I found a refurb S7 last month and it has 90%, easily lasts 1 day including a workout and music, plus I kept my 4 as backup (charge to at least 60% then turn OFF in settings menu til I need it).