My phone had the same situation. My friend installed some fake iphone thing. I recently uninstalled it, but this morning i unplugged it from the charger and it said that it was still charging. I didnt think anything of it, being 13, a phone which doesnt run out of battery is ideal to be honest. But later on tonight it started vibrating. Like when you unplug the charger it'll vibrate or beep notifying you have unplugged it. Same when you plug it back in. My phone started doing this, constantly, i didnt know what to do. Im on my dads vodaphone contract and cannot get another replacement phone. I went into privacy setting and did a factory reset turned it off and left it charge. I unplugged it once fully charged and thought finally its fixed. Then noticed it still claimed it was charging. I looked this up and found this answer. Ive moved it a little bit it went back into the place. Then pressed the home button as i would if it was off and charging and the battery symbol didnt appear. Think ive fixed. But what if its burning out on the inside, is it safe to turn on now? how do i know if its burning out?
cheers so much, meggan x