My Apple watch
Apple watch model MWW02LL/A battery will not hold a charge anymore. How do I get another battery? Thank you
Apple Watch Series 5, watchOS 9
Question marked as
For repair & service:
watch Repair - Official Apple Support
watch Service Pricing - Apple Support
Your best option may be to make an appointment at the Genius Bar in an Apple Store near you and let them look at it:
Genius Bar Reservation and Apple Support Options - Apple