Nexus 5 / Hammerhead battery boost? Disable auto-rotate & reboot for slower drain.
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 In case this helps the devs or someone here, I thought it good to submit my observations. I noticed that, when idle, my Nexus 5 (with the latest 15.04/stable) had a pair of 4%-cpu-consuming background processes: - /system/bin/sensorservice Binder_2
- sensors.qcom
 Following the advice of these Android posts: - https://forums.androidcentral.com/lg-g2/344315-what-sensors-qcom-why-using-so-much-battery.html
- turn off auto-rotate
 
- https://forum.xda-developers.com/showthread.php?t=2546645
- must reboot "a couple of times"
 
 ... I disabled auto-rotate & rebooted... the process then settled out rather quickly, and (I imagine) my battery will last longer. Hopefully someone might find this helpful.