Help needed! Last night I put the iPhone charging as usual. However at the morning the battery percentage was even lower. So it didn't charge at all. Now it is 0 % and the phone is dead. It still says it is charging but actually isn't. Now I can't even turn it on because it only shows the charging symbol. I already tried different cables and chargers (all Apple). I also tried to restore the phone on iTunes. It actually installs the software but after that turns off and won't turn on again. So I couldn't even restore it from the backup... Is the problem the battery or something worse? Thank you.