Extended battery that was on sale here a few weeks ago, AOKP Build 4 installed after a clean wipe, Franco M5 set to balanced power mode and I'm at 15 hours and 25 minutes off charger with 58% of the battery left. This is with all radios on and moderate use, texting, calls, reading a book on the kindle app for about 30 minutes, and streaming music both through bluetooth and plugged into some speakers at the house for a couple hours. Oh I've also got 3 Gmail accounts, G+, G Drive, G Reader, Twitter, Facebook, and Chrome all syncing.
Before Build 4 this kind of performance was unheard of for me. Now the other related thing is that I got a work phone and disconnected my link to my companies Exchange server.