crxssi
Linux: The power beneath
My Nexus 5 wasn't rooted or anything with sync on and wifi off and would last about 8 hours till it dies.
What people keep telling you is that it is not the phone battery or design. The N5 battery is just as good as any other similarly speced phone. There is something peculiar about your environment, how you have the settings, what you loaded, or you just plain have a defective phone. Granted, figuring out what is exactly doing wrong can be difficult. But your are essentially claiming the N5 has a poor battery and/or generally poor battery life, and that is simply not the case. In similar setups and conditions (and carrier), it should provide a similar life as a Samsung G4, a Moto X, a Sony Experia Z, or an HTC One. Comparing it to a Note 3 (which is a phablet) with a huge 3.2 Ah battery is not a fair comparison.
I will echo what everyone else is pretty much telling you.... my N5 has considerably better battery life than any phone I have ever had, including the Evo LTE it just replaced. On days I carry it but don't use it, when I get home from work after 9 hours, it used about 5%. If I take some pics, browse a bit at lunch, send a few texts, it might use 8% after the 9 hours. Add playing a game, more browsing, and a short few calls, it might use 15% after the 9 hours.
I have Google Now off, "OK Google" off, syncing Gmail/contacts on (all other sync off), WiFi ON and connected all day (at 2 to 3 bars), 4G LTE ON (with 1 to 2 bars), bluetooth ON, location on battery save mode, NFC ON, no social media apps, and brightness on auto.