Why does my iphone battery run out so fast?

My battery was lasting normal but all of a sudden I don't even use it and it drains my battery and I always lock it when I'm done using it

Maybe all your applications are running. Double click the home button, all the running apps will pop out. Press and hold an application to turn it off

Too much apps running or an app is using gps consonantly.

Clear multitasking
Press the home button twice, press and hold an app, when it starts to shake, press the red icon with the minus symbol. Do this until there's until there's no more apps.

Check gps
http://lifehacker.com/...ur-battery

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