I have a Apple Watch Series 5 GPS only thats been at 80% for months but the battery life is horrible. Getting worse. Once it drops below 80, I plan to take it to Apple for a battery replacement. Do they replace the battery or give me a refurbished unit?
They charge more the older the model is. I just did this, I don’t have Apple Care, and it cost me around 20,000 yen (I’m in Japan). Don’t be surprised if it costs you over $100.
You do get a whole new refurbished unit though, which is nice.