Here's another common problem. What user Nexus upgraded to a new version of Android has not happened? Your device drains the battery excessively so that it is impossible to use it for a decent time. Battery problems are always the most common, so now that Nexus have been upgraded to Android 6.0 Marshmallow. According to numerous reports, the Nexus owners complain that their battery does not last all teams. Most of these problems have to do with applications, so the first thing I recommend is to try to isolate the defective application. If you access the Settings section you'll know which application or function you are using more resources (a function that is integrated into Marshmallow).
After determining the cause, the first thing you should do is to annihilate the application or attempting a new installation. An interesting alternative, if you do not get to locate the cause of the drain, is turn on the computer in Safe Mode to disable third-party applications. Do it like this:
1) With the screen of your computer turned on, press and hold the power button. Touch and hold the Shut Down option in the dialog box.
2) Touch OK to start in Safe Mode. Try turning off the GPS options, WiFi and Google maps because this can quickly drain the battery.
If the problem persists will need to do a restore to factory settings.