Incidentally, just replaced batteries in my Apple Watch S6, MBP M1 2020, and iPhone 12 Pro Max during a one-day visit to Shenzhen. A dude in Huaqiangbei did everything in two hours for a small fraction of what Apple would charge.
ECG stopped working reliably after the battery replacement, but otherwise the watch should be good for another few years (stuck on watchOS 26.x)
ECG stopped working reliably after the battery replacement, but otherwise the watch should be good for another few years (stuck on watchOS 26.x)