Xiomi is perhaps one of the best brands when it comes to budget range smartphones. Xiomi note 4 64gb is the best seller of 2017. Coming to the specifications of the phone-
The phone comes with a 4100mah battery which best battery performance at this price range. The phone comes with a 64gb storage which you can upgrade upto 128gb. Coming to speed, well the phone comes with 4gb ram, which provides superior performance. Its a 5.5 inch phone with a very good display resolution.Overall best phone under 10 to 15k range.