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My Xperia Z also show about 4 days with Stamina mode on. Your battery its fine. The battery can last longer if you don't use it that much, remember that your phone is learning as you use it.
Don't let youtube videos fool you, there are myriad reasons as to why your battery wont last as much as other users, it has to do on how many apps, how many background apps, network coverage, how often you use your phone, alarms, sync, etc etc
Don't forget to give Kudos
This thread should explain it better
STAMINA mode explained
http://talk.sonymobile.com/t5/Xperia-Z-ZL-ZR/STAMINA-mode-explained/m-p/314643/highlight/true#M6296
Don't forget to give Kudos
Indeed its normal, btw it doesn't hurt to have the latest firmware
Update Service (SUS)
http://www.sonymobile.com/gb/tools/update-service/
http://www-support-downloads.sonymobile.com/Software%20Downloads/Update_Service_Setup-2.11.12.5.exe
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
Don't forget the Kudos