Why does my iPhone 4 battery run out so quickly?

I have an iPhone 4 running IOS 7, and my battery runs or way to quickly. I did all the things in the settings that are supposed to help battery life but they didn't work. I also always close out of my apps. Is it just IOS 7, or do I need a new battery. It runs out at a rate of about 1%/per one and a half minutes on usage, and 10%/hr on standby.

That happens with my iPhone 4 to, it was on 100% charge this morning and now it's on like 20%, it's probably just ios 7 because when mine was on ios 6, the battery was actually good. On ios 7, it will take very quick to fully charge and very quick to die out. I'd say this is nothing to worry about.

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