battery replacement iWatch
How do I go about replacing the battery on my iWatch?
Apple Watch Series 1, watchOS 6
Question marked as
If your signature is correct and you actually own a Series 1 Watch, you don't. A Series 1 watch is too old to qualify for service at this point. If you own a newer Apple Watch, it would qualify.
See this link --> Apple Watch Service & Repair - Apple Support
It's time to invest instead in a newer, more modern Apple Watch.