Iphone 13 battery draining faster after ios 17 update

@Apple are not here

Give it three days and if no better, backup, erase all content and settings, then restore from backup.

If still a problem erase again and set up from scratch without restoring the backup without any frivolous or security apps.

Ensure all your data is sync'd to iCloud first - iPhone Settings, [your name], iCloud, (show all) everything turned on.

Downgrade to ios 16.7 update it’s usually due to the features that apple have added in ios 17 those require more power from processor so it makes the battery drain faster.