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Go to Settings -> Power Management -> Battery Usage and check what apps are draining your battery most.
Hi,
The Battery usage menu that Quester mentioned, shows what functions that has used battery since the last charge. So you should check this menu when you have around 5-10% left of the battery.
Hi @Seba0284
I also suggest check these links:
http://talk.sonymobile.com/t5/FAQ/Battery-time-and-enhancement-features/m-p/347874#U347874
I'm at disposal for any question.
Best Regards,