Horrible battery life with Oreo


My wife and I both bought Note 8's less than 2 weeks ago.  I immediately updated to Oreo; she hasn't yet.  My battery life is horrible.  I've been off the charger for 2 hours, and I'm down to 64%.  Hers isn't great, but her phone can last all day.  I've disabled background data for a lot of apps, but that doesn't seem to help. 

It appears that there are a lot of other people having issues with Oreo/Note8 battery life.  Do I have any options, other than returning the phone for a warranty replacement and not upgrading the new phone to Oreo?

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