Why is my battery running down on an iPhone 4 running iOS 7?

Why is my battery running down on my iPhone 4 when I'm not using my phone and all apps are closed? My phone will have a full charge at night, no apps running. Bluetooth is off, automatic updates are off, backgroud app refresh is off, and by morning the battery's charge has dropped to 50%. Some nights it will only drop 1-2% though, with no changes made. How can I fix this?
Also, since the update I am not receiving push notifications for some apps that I have them turned on for (turned on both in settings, and the app itself).
Any helpful advice is greatly appreciated.

I had been having battery problems with my Iphone 5 and decided to make a trip to the genuis bar, in the end they replaced my battery and reset my software because i had a failing battery and the hardware was malfunctioning. You may have something similar. I would recommend making a reservation to the genius bar online. They can then run a diagnostic on your iphone and get back detailed results on the current condition of your battery and wether or not the software controlling it is working. If you have applecare currently then they can replace the battery for free, if not there is a charge of around $70. If it turns out you have a different problem than they probably will be able to find out and give you better advice than I can!
Good Luck!

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Has anyone else found his/her battery draining more quickly than normal.
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Dear friends from BlackBerry,
First, I´m sory for my bad english.
I live in Brazil and i have a blackberry curve 8520, my problem is the battery.
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Why is my battery running down on an iPhone 4 running iOS 7?

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