Originally Posted by nikon120
Normally I'd suggest installing BetterBatteryStats and see what is keeping your device awake, but it could be your sync settings/frequency, radio signal strength, and etc that are the culprit.
Factory reset again and install only updates for stock apps. Leave all other 3rd party app off your phone for 24hours. Use the phone as a phone, rather than a social and gaming platform for that amount of time.
See if you get better life at that point. If so, then it's at least one or multiple apps that you need to monitor closely. Best way is to get your baseline as I suggested, and then install apps one-by-one to find the issue.
Sent from my Nexus 5 using Tapatalk
If using the device stock with only stock apps doesn't increase your battery life the problem could be hardware related too.
The first N5 which I ordered the day it launched had the battery life fall to almost half
I tried everything I could think of, flash stock, factory reset, dim brightness, disable everything, only use 3G nothing worked.
then the earpiece started to go, called google for a RMA and the new device works perfectly
with the same apps installed I'm now getting 4 - 4 1/2 hours of SOT when I was lucky to get 3 before, usually 2 1/2
Seems battery had a hardware issue as well, I had been chalking it up to software battery drain issues, but it was definately hardware in my case.
Nexus 5 (Personal)
HTC First (Work)
Retired Phones: AT&T Galaxy S4, Nexus 4, AT&T Galaxy S II,GSM Galaxy Nexus,HTC Rezound, Thunderbolt, Captivate, Focus (WP7), Blackberry Torch, iPhone3GS