This app shows where your car's battery health stands compared to other Model 3 cars with the same milage. BatteryCompare: for EV Cars
That's from the Stats developer. I was thinking it should be included for those who already have Stats, but it's the developer's choice on how he wants to make a living.
That would be the stats app. Once you install on your phone or tablet, you can install the Tesla watch features, using Apples watch app.
Not on mine, I only see efficiency and phantom drain compared to others, not battery health. If they would add as an integrated in app purchase, I would get it. But I believe it is a separate app at this point. Also unlike stats that automatically gathers all the data, compare my battery requires the manual entry of data.