cores overheat issue

[xxxanmol]

Hi I am new to this thread dont know how to start but lets start ........as my problem is that whenever I play sanandreas my core temp reaches to 90 as my idle remains at 51-56 it becomes really hard to hold..

I don't t know is it hardware issue or battery issue as I had not change my battery from my 1st purchase around 3 years ago

At now using ressurection ROM 4.4.2
Thxx