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@LMN,
The way it works is, when your phone is idle and not on charge, Android will limit the background activity of applications that are being optimised. So for example, if you receive an email while your phone is idle, you may not receive the notification for that email until you next wake your phone.
Since I updated my Xperia 3 D6603 my Stamina has been completely replace with Battery usage.No sign of Stamina. Will it return also in days or weeks time?
Welcome to the community.
Stamina Mode was replaced by Doze in 6.0, which is built in to the core operating system of Android. As it performed a similiar function to Stamina Mode, it was not included in this update.
Due to popular demand however, a form of Stamina Mode will be added to a future firmware update.
Yes, but the rumor is that it will be re-implemented
As of right now it has Doze
Settings > battery > menu