What I did, to allow me to have 1 day plus 6 hours, with 60% charge left (!!!) (the secong image shows the HUGE discharge curve, with the Google+ app's settings to allow auto-backup, etc):
1. Completely turned off any kind of auto-back of photos, etc.
2. Left Google Now ON (because I get updates on Google Glass).
3. Opted out of interest-based ads
4. Left alone the Android Device Manager, to allow me to remotely locate the device, and also allow remote lock and erase.
That's it! Now I get quite decent battery charge life.
The secret IS in the Settings for the Google+ app!