I had like 90something battery last night. Left the phone on my nightstand. Woke up late because didn't hear the alarm. The phone was off. Wouldn't turn on when I held down each button. Wouldn't respond to being plugged in through the computer nor the wall and this was after I left it charging for like 20 mins while I got ready for work. On the way to work, thinking I'd hit Apple during lunch, I hold down both buttons and the **** turns on with like 80something battery. It works normal now.