Why won't my phone turn on?

My phone's had some battery issues for the past 3 months, but this is the peak of it. I have an iPhone 6 and have had it for a little more than 2 years. My phone died, and I plugged it back in. The phone shows that it is charging (it registers the cable) but it's been charging for 5 hours and still hasn't been able to turn on. What can I do?

Battery replacement. Setup an appointment at a apple store and have them take a look at it.

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