Why does my I-watch not hold a charge and is not charging
Why does my i watch not hold a charge and has trouble charging
Question marked as
It sounds like the battery is dying. If you tried the steps in:
If your Apple Watch won't charge or it won't turn on - Apple Support
Then if you still need help, contact Apple Support.
For repair & service:
watch Repair - Official Apple Support
watch Service Pricing - Apple Support