[Nexus 4 General] backstudio:
History: as aprevious iPhone 4 user but long time android tablet user, I was less accustomed to battery consumption on Android phones. I was experiencing sleep usage (data on, WiFi connected to home network and good signal, Bluetooth radio on but not in use) of approximately 6-10% per hour. After reading battery life posts from other users on these and other forums, it appeared this was excessive. I had, after enabling these items (Google now, Google +) decided to disable them. But usage varied little. On screen time was about 3:40 or so. I had Google voice and Pandora installed. I was using built in email client, 3 accounts, fetching every 30 minutes including 1 @gmail domain account, what's app running, skype installed but not running or notifying. Battery usage stats indicated nothing excessive, Voice, What's App and Pandora had a process or two running along with WWF and SWF (notifications set for 1 or 2 hours) but batt stats did not indicate anything unusual with OS. Pulse, AP press, Flipboard installed but set to only sync/update when using the app.

First fix attempt: installed juice defender and set to aggressive. Battery use dropped to 3%/hr when left untouched for the hour. Emails weren't coming through regularly because of the JD and email client timing off sync. Installed K9 and set to 10 minutes fetch for all three accounts. Battery usage about the same for on screen. Better performance. Could get through 10-12 hour day with moderate use texts, emails, news apps (pulse clipboard ap) and a few pics. But battery drain seemed to be drastic when using apps and the unit started to drain when idle at a rate of about 4% (could be signal cell tower location cgange , etc). Overall acceptable but still "less" than when compared to forum posts and previous phone experience.

Second and present attempt: installed wugroot toolkit 1.6.2. Unlocked boot loader, rooted phone and installed custom recovery. Returned to stock. Rerooted and relocked. Installed no accounts on reboot. Installed Google account afterwards with same calendar and contact setting auto sync only. No Google +, no Google now, NO Google voice. No gmail. No pulse no clipboard no AP. Researched and installed Taptu in lieu of Pulse. Installed Aqua mail as email client for three email accounts(at least now I can change the account an email is sent from after beginning to compose an email!). Reinstalled Evernote, drop box, Google drive (manual sync for all three). Did NOT reinstall Juice Defender.

Battery use, when left untouched for an hour is almost NIL! (Still says charged) After 2 hours phone is at 98% or 99% when before it could be 82-88%. This is a revelation. 35 minutes of playing granny smith consumes 10% of battery, interpolation (all I can go on at this point) would mean almost 5 hours of constant screen use and less with standby time . WiFi, data, Bluetooth (not in use) enabled. NFC disabled and same settings as mentioned above.

Explanations: Google voice could be a severe drain, but I will not install yet until I am convinced it's innocuous as I am afraid an install and uninstall could "mess things up" with the OS. OR Google + and Google Now can not be installed and then uninstalled without leaving something running in the OS contributing to battery drain. OR pulse, flipboard and ap are not behaving well in manual sync modes.OR the wipe and reinstall via Wugroot has eliminated a bug from original factory setup. Regardless, the phone battery use appears in line with the positive experiences of those in these forums. I suggest, as much of a pain it might be, to give this a whirl if you are technically inclined. Please note all data will be wiped by this process and while I backed everything up via wugroot in case of a disaster scenario, I did not restore ANY data from those backups for the reflash of 4.2.1 and reroot, relock process.