I bought a Google Nexus 5X a week ago, and I'm surprised by the autonomy. Being 100% charged at 9:00 AM, at ~7:00 PM the battery is empty. I use about an hour of Spotify a day and Facebook & Messenger are installed.
I run on a Android 6.0.1 that seems to be fully updated.
I can give it back to my reseller, but it is really an anomaly ?