The Pixel Watch was previously known for poor battery life but was improved in the sequel. However, recent updates seem to be affecting battery life. Users are reporting faster draining of their smartwatches since the June 2024 update. This issue appears to be more widespread than previous updates. Google may need to address this problem with a future update. The 9to5Google community is also experiencing battery life issues with their Pixel Watch 2 units. It remains to be seen if Google will provide a solution to this problem in the future.
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https://9to5google.com/2024/06/21/pixel-watch-battery-update-issues-reports/