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You are probably uploading, syncing multiple apps, that's why its using up your battery, re-install the latest update and check again
What does it say if you check under settings > power management > battery? What is draining most of the battery?
The phone needs some time to adapt to new OS.Wait some more,it should stabilise.
Is this Xperia L too?
Ive also gota problem when i updated it to 4.2.2.
Vertical lines on front camera.
I will be visiting the Sony Service Center this weekend for that,,
hoping it is just about software..