battery drains

[AjAygorade]

sony plz fix the battery issue of xperia p its horrible after update of 4.2 jb stamina mode also dosent work plz fix this in a new update 

[Hampus]

Hi and welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.

How did you update your phone to Android 4.2? The latest & final version for Xperia P is Android 4.1.

I suggest that you take a look at the following FAQ-topic:
http://talk.sonymobile.com/t5/FAQ/Battery-time-and-enhancement-features/m-p/347874

You could also check battery consumption via Settings > Power management > Battery to see if you find anything abnormal.