Why is my iphone 5c dying so fast?

So i don't know why it's dying so fast. I barely got it and i don't know. Is it iOS 7? Is it because I charged wrong the first night. I didn't let it die all the way because I heard it wasn't necessary.

Let me guess, you constantly text for 5 hours straight and then wonder why the battery isn't 90%. Lol

Because Apple doesn't know how to put a bigger battery into a phone. 1, 510 mAh battery, lol.
@Markus, nope because Apple sucks balls at making a phone with good battery.

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