Why does my iphone battery die fast?

It will say I have like 20% or 30% then die on me. Anybody else have this problem?

According to the apple site you have to let the phone go down below 20% once a month and then charge to get an accurate battery reading. So if you haven't been doing that, the reading may be wrong.

That link below about to manage you battery for perform

I actually did have this exact same problem with my iPhone 5. At first, I tried restoring it to see if that would fix it but it didn't. So I went to the Apple store and they took a look at it. They opened up the phone and found out that something wasn't connected right. The guy there told me that although he could fix it, it would probably disconnect again and you would have the same issue. So he replaced my phone for free. (I only had like 5 days left on my warranty too lol)

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