Why does my phone lose its charge so fast?
My phone can't hold a charge for more than a few hours when it used to be able to run for well over a day of me using it. Help?
Try closing all open apps, by pressing the recent apps button on the bottom of the screen. Close the apps by swiping them to the right.
If closing all the apps doesn't help with your battery life issue, it may be a problem with the battery itself or the phone may need to be recalibrated. Check out HTC One (M8) Troubleshooting for more information pertaining to your phone.