Today, my phone was on 40% and all of a sudden it started dropping extremely quickly to 1% in a matter of a few minutes without me even using it. I then turned it off, in hope that when i turned it back on it would be fixed. It just stayed off and showed me the low battery symbol. So i put it on the charger and it took half an hour or more to turn on and when it did it remained on 1% and hasn't moved since. Please help?!