Using a Nexus 5 and your battery is dying fast?
The bug can cause the phone’s CPU to become maxed out — resulting in battery drain — when using the camera, with “mm-qcamera-daemon” showing high battery consumption in Android’s power consumption display. via Google pinpoints Nexus 5 camera/CPU usage bug, fix coming in next Android release
Google has the fix ready but it will only be updated in the next release. Current solution is to reboot the phone and if you are using Skype, uninstall too because it triggers the bug in the background.