Share your experience!
Try to disable task killers,free ram apps.Restart the phone regulary.Try a force stop for your phone.
http://www.xperiablog.net/2013/04/06/xperia-sp-manual-now-available/
Repair phone software with sony update service.
Stock rom has inconsistant battery drain, sometrimes its good othertimes bad. Hopefully 4.3 will fix it. Look at my screenshot below, standby drain increased 4x for no reason, most times restarting doesn't fix it, just seems random.
@Nabeel
Suggestion in your link
http://talk.sonymobile.com/t5/FAQ/Facing-problems-with-abnormal-battery-and-shutdown/td-p/320375
to press and hold volume up and Power button to invoke force shutdown does NOT work on SP
On SP you can try to press the shut down button:http://www.xperiablog.net/2013/04/06/xperia-sp-manual-now-available/