Iphone 6 is not turning on for no reason?

I was on my phone before i went to bed (it was working just fine), i put it on the charger and now it won't turn on. It showed a no charge sign once so i put it on a different charger, but it has been charging for two days now and it won't turn on/show anything on the screen?! I've also tried restarting it by holding the home and power button down and nothing!

Water damage or battery burn out

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