Heres something that might help your battery life:
0.5) Go into terminal and type “su” and then “rm /data/system/batterystats.bin” Then reboot.
1)Charge to max capacity normally.
2)While still plugged in, removed the battery. (make sure this is the wallcharger and not the usb computer charger)
3)Wait until the screen has a giant battery with a questionmark on it
4) Put it in again and let it charge. It Should say some kind of number that isnt 100% This should charge it to its full capacity and have great battery life. Do this after everytime you flash a new rom. It has worked for me

credit :antonyfl@xda ครับ