I have to confirm this in part, although I haven't had the phone for very long. It's possible that it will get better. Mine doesn't last a day, I usually have to charge it at 4pm.

I have no problems with the battery, lasts 1 - 1/2 days! Always have location and Bluetooth off :)

Unfortunately, the battery life is really not that good :( The only other thing I can criticise is the camera speed, it takes what feels like 2 seconds for the camera to trigger. Otherwise, the Nexus 5X is a top device :)