With charging it every day, the battery is going to last 2-3 years before you'll want to have it replace because it doesn't last the full day after that many charges. By the time you need to get the battery replaced, you might find it's probably better off to spend that $79 battery replacement fee towards the newest Apple watch. I hate that these things are pretty much disposable tech now. Not as disposable as the Airpods but not that far off.