I got a HTC one a little over a month and a half ago and battery seemed normal, then all of a sudden it started showing high Android System useage and it drained pretty quick. Then an update came through and all seemed to work well. But now in the past couple days when I charge my phone within 40 min or less it drops 10% battery and im not even using it. I even took it to an att store today to have them look at it and nothing inside was wrong. They said an update was available so i had em reboot it with the new update and I take it home and charge it and when its done, within 48 min it drops to 86%. There has to be something going on. Any help?