Chosen Solution

Hey, so before a went to sleep, i left my phone in the charger and when i woke up it was on 100% and then i took it off of the charger and went on it for just about 2 minutes then i put it back on the charger then i left, three hours later i come back and it wont turn on, i try rebooting it, charging it again, pressing sleep and home button, but nothing. Also, this wasn’t just recently, this happened like a month ago and i still can’t find out what happened, so i need your help, please.

It’s most likely the battery, after so many years they become degraded to the point they become unusable. I’m going to attach the iPhone 6 kit ifixit offers.