Apple Watch 4 and iOS 6.2.5 - update and battery

I have the same exact problem. Did all the suggestions from Apple and nothing helped. Waiting a few days didn't help. There is an issue with 6.2.5. I hope they admit it soon and drop a new update. Because of the update, I went from all day use to only about 8 hours. Unacceptable.

Sometimes after an update the battery takes a little while to recalibrate,give it a couple of days to see if it improves.

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Massive battery drain after WatchOS 5.2 u… - Apple Community

Yes! My watch battery dies after 2 hours. I have reset the watch, unpaired and paired, turned everything off and on and it's terrible.