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I Got Xperia U 15 Days Ago It Very Nice n Attreactive Phone Loving It.Bt 4m 2-3 Days It Starts Giving Me Battery Problem.It Works Properly For 2 weeks.Bt Now It's Battery is Draining Fast.Yesterday I Charged It 100% Before Gng To Sleep.After Charging It I Used Net For Apprx 10 mins Then I Go 4 a sleep.When I wake up i saw its battery Remaining is only 48% everything is off on it like data cnnctn,wifi,bluetooth,auto-sync,facebook etc. When I Se Battery Graph Its Showing Me Baatery used in Dispaly 55%,Android Os 10%,Cell Stanby 9%,Phone Idle 6%,Android System 4%,Reccomnder 2%.Is It Hardware Or Software Problem?plz Suggest a Solution.
Try to use this app. It helped me a lot. But i'm not sure with your case 
https://play.google.com/store/apps/details?id=com.easy.battery.saver&hl=en
Phone Got A Preinstalled Power saver bt i dont use it only use it when battery is less then 25%.And About Battery Ma Always Have 60-70% Brightness Level and Very Less Use Of Data,wifi,3g etc I Only Use It For Sometimes Playing Game Of TAking Pictures.
Your usage seems normal.
Some points to remember...
I have a bought xperia U before 15 days and i am facing a battery issue.
The mobile heats up easily during 3g internet usage with full brightness, that is not the main problem though!!
When mobile battery reaches 40% or below (and is heated due to 3g use), there is some sound in the device and it shuts off just like that..
When i connect to the charger it starts only after 5 minutes and the battery shows 1% and charging..
I thought it would be an initial issue due to new battery but its not being solved.
Please help me.
Murtaza.
Yesterday I Updated Ma Phone By The Update Service.And At Night I Charged It 100%.Today When I Wake Up Its Battery Showing Me 90% Remaining With Ol Data Cnnctn,wifi,3g etc. Off.I Also Disabled Mobile Bravia Engine And Changed Live Wallapaper Too.In Battery Use Graph It Shows Display 43%,Cell Standby 26%,Phone Idle 17%,Android Os 11% And Android System 2%.
Why Display Is Using 43% Of Battery When Ma Phone Is On Standby Mode?
And IS Ma Battery Ok?or Shld I Go To Service Centre N THnx 4 Ol Ur Opinion And Advices.
it's using 43% of that 10% of battery that was used, not that it used 40% of your total battery, how long was the Display on?
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i knw dat and i used it for apprx 5-10 mins only when i locked screen its batter level is 99%
Hey Bro Now New Problem Appear Whenever I Turn On Data Cnnctn And Surf For A While The Signal Drops And After Few Seconds It Regains The Signal Bt After Few Seconds It Agains Drop It Happens Till When I Disccnct The Data Cnnctn
how old is your SIM card?
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It's Two Year Old Bt The Phone ALso have Same Problem With The New Sim Too.Plz Help I Am Sony's Fan N Its Ma First Phone Of Sony Before It Am Having A Nokia Cell n I Never Faced Any Issue In 2 Years With It Like Battery,Signal Or Any Other.