https://wccftech.com/watchos-7-brings-battery-health-compatible-apple-watch-models/

When Apple previewed watchOS 7 during its WWDC 2020 keynote, there were lots of features to look forward to when the update would drop later in the year. However, one interesting find by a Reddit user Xx_Kellan_xX will help wearers know if they should replace the battery of their existing Apple Watch or upgrade to a newer version altogether. Yes, you guessed right; Battery Health will be coming to watchOS 7.

The feature was previously available for iPhones and it was delivered after Apple came under fire for deliberately slowing down existing iPhone models in order to preserve battery life. Apple later apologized and introduced the Battery Health feature with which iPhone users could monitor the existing percentage of a battery’s overall capacity. With the feature arriving for compatible Apple Watch models, which in this case is Apple Watch Series 3, and later, owners will be able to check how long before a cell replacement is in order.