What to do when my Apple iPhone 6 turns black?

I have an iPhone 6.  I have used it for about two years. My battery finishes quick. Also if I use my phone for more than 5min it switches of itself and has the loading system. When the phone turns back on it says 10% even if it was 100%

Hi Alisha. Looks like you have a bad battery. Take it to an Apple service center and get a battery replacement.

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