Posting a screenshot from my ATT s4. I used to get terrible battery life with the stock ROM, no matter what I tried to help it. Now with CM 10.2 2013-12-05 I think I have a very good option. The only issue I had to resolve was messaging app. I wanted to use the ATT app, and found out I had to remove or disable all competing apps, like chats, hangouts, and 3rd party message apps. Then it would set up fine as long as you have 3 bars signal.
Sent from my SGH-I337 using XDA Premium 4 mobile app
I'm a 64 year old "wanna-be geek" It takes me hours to do what takes most geeks only minutes.
Samsung Galaxy Tab 2 10.1, CWM Advanced recovery, KitKat 4.4.2 CM11 rom by CodyF86 & Android Andi, Dhollman kernel, 1.4GHZ
32GB Ultra micro SD card.
Samsung Galaxy S4 SGH-I337 AT&T CM 10.2, Philz Touch, and Root (this phone is freakin' awesome)
No more Apple for me.