So, I received an iPhone from a teacher at my school to work on today. She said she didn't know what was wrong with it, only that it wouldn't hold a charge and that they just wanted a new battery so they could sell it. I assured her that I'd check it out and see if it would even need one. This is what the screen says when I turn it on: Can anyone tell me how many years I'll have to tell her it'll take me to test the battery? How do I reset the phone?