Why is my iPhone dying at 100%?

So recently my phone has been dying at 50% until 2 days ago where it can barely go without being constantly charged. I have an iPhone 5s, and it's updated to iOS 8.3. If you have answers it'll really help, this is so inconvenient.

Hmm… I don't have an expertise in how batteries work or atoms but I'll try (because this seems abnormal).

Not exactly sure what you mean "dying at 50%", if you can clear that up I'll edit my answer. There's two possible issues though. 1) Being that you have your phone plugged in too much. Doing this will increasingly cause your phone to be more dependent on a constant energy source. Therefore causing it to die much faster. 2) Your battery doesn't seem old, but it may be broken. Charging a phone has a bunch to do with atoms, bonding atoms and breaking them. I don't really know the science behind it but it just means you need a new battery.

Best of luck

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