I had an issue where battery life would be "normal" for me the first day (roughly drop 20-25%), then the second day would drain from 75% to 15-20%. I restarted my watch and still waiting to see the results of the second day, which is today. I'm at 75% now (9:15am ET). My typical second day would end with 50-65% battery remaining, so I can get 3 days out of it.
Please try clearing the system cache and rebooting your device.
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