I, too, just started experiencing battery drain. I noticed the mm-qcamera-daemon draining 86% of my battery. I do not have Yahoo Messenger. I did follow the uninstalled applications most people posted on the web. Deleted or at least tried to uninstalled all google stuff but it won't let me. My guess is they are factory installed. I also trashed my camera icon off the home screen. That did not help. It thought it was the Flashlight but I uninstalled that, too. I have a Note 3. Powered down twice.