I've been having the same issue with my series 4 since I upgraded to watchOS 7.1, 7.2 and now 7.3. Went to the shops and was told everytime, to just wait for the updates. Tried unpairing, re-pairing, resetting and still drains like crazy. Battery used to last about 2 days. Now, it drains 5%-10% every hour, normal usage. I have to charge it at least twice a day. Please fix this, Apple.
ooijosephine
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Penang, Malaysia