Suggest the best battery equipped smartphone with dual core processor under 10K?

Hi, i am looking to buy a new smartphone and as there are thousand of option available in the smartphone industry but to buy a phone by researching all it's specifications and features i finalise that the smartphone must have better ram, huge power capacity, 3.5 inches of screen and to make it faster a dual core processor under low cost price tag. So suggest me the best smartphone with huge power capacity.

I like your question, if you are looking any smartphone from native or chinese makers then only you can get a high powered battery. Otherwise if you are looking for branded one than please enlarge your budget as 1GB of RAM comes under or above 20K budget.