dear @civato thanks a lot again.
Tried for another day and even with some heavy use I got more than 24 hours and still 30% battery left. That is really awesome. I used voicecall around 40 minutes, some music with bluetooth, few photo and video clicks, lots of Gallery browsing (see screenshot) and still got 30%, that means it can go longer with minimal use. Well I can now say...this is one of the best StockRom in xda at the moment.
PS: There is no major change done on device, except I usually use ATK with Crazy killing of apps every hour. But I am not sure the battery improved for that reason or not. May be not.....anyways waiting a day was worthwhile....
OK that is good news and that is exactly the same what happend with me , the first day I tought , oh no bad battery life but then it started changing and now it is good .
I'm glad it worked out the same for you ! ENJOY it m8!