i have a note 9 which was good in android 8.0 battery was little less but after the android pie update my phone was terrible graphics were not loading and picture quality was dropped very bad experience after buying a phone like note 9 which is a flagship device for 70k and not even getting performance like a oneplus 6 as i reached to samsung service center regarding the issue they just did the factory reset and gave me back the phone still same problems and i even sent feedback in memebrs app sent log data but no use never buy a samsung phone.i do not recomendt to anyone ever.
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Yes me also facing the same problem, my Note 9 after update to Pie very worst in battery Backup, not even till afternoon. So every day afternoon i recharge it again. Andriod 8.0 was very very Good Backup in battery and all and was last till night 11PM and more. But this Pie update to Galaxy Note 9 is totally waste waste, I wasted my money. Why this bledy bledy Samsung Electronics was not done properly this Pie update.