I have had my phone since mid- October. Today, unplugged at 4:30 a.m. it was at 100%. Not using any apps, no apps running, wifi on ( as I usually have it) battery is now at 53% ( 8:00 a.m.) Never had it go down that far that fast. Any ideas? Usually, with the way I use it, the battery goes for most of the day. Went down 1% just in this posting.