problem battery topic

hi to all
i been use cm11 on my st27i and when i flash to cm12 i have problems in my battery so
i reflash again to cm11 v30 and i have same problem
i replace the battery whis a new one but the same problem again,i flash brevekernel refresh and the same problem and when i wont to rebbot my phone the battery will be more power always
my problem is when i use my phone some time when i touch the screen it turn off and when i have a call and i wont to answer it turn off.so please whats happen to my phone please anyone help me i love sony go