My friend dropped his iPhone 7 and his iPhone was messed up. I don’t know the full story but he says it only charges to 3% on a dead battery. Recently he took it to a repair store where they took it apart and when they put it back together it showed the connect to iTunes/restore. They said to restore it at home and right now he is trying to fix it. Is this a common problem? I’m asking these questions because I’m debating weather I should buy this iPhone for a cheap price.