This is my first “lament” for any Apple product I’ve ever owned. My Apple Watch was purchased 20 months ago, at just over $500. Today the battery sometimes fails within an hour of removing it from the charger, and typically will only last about eight hours during the day. The Battery app shows 86%. An Apple Store Genius ran diagnostics (no issues), then a total reinstall of the OS. I went to the Apple Store with the intention of having the battery replaced ($79 on Apple’s support site), but Apple won’t replace the battery (even though I’m paying!) unless the battery is below 80%. So, the watch goes into the dresser drawer until the battery reaches 79%.