The one up there who said it would burn out isn't stupid, is it? Since the battery is installed backwards, that means that the phone and the battery contact is not on, it is impossible to get electricity, let alone burn the phone. As for you saying that you can't open the machine now, it's probably because you didn't find it in time after the installation was reversed, and the contact of the cell phone battery slot was damaged, and it won't cost much to repair it at the mobile phone repair shop.