Machan I don't think that's an official rom.
in this thread u can find the latest 7.2 global stable rom. try flashing it. maybe if it's able to solve the battery problem then it's better than nothing neh..
http://en.miui.com/thread-262691-1-1.html
credits : dmtx for the link
well its the ROM the phone came with..

seriously not keen on flashing roms as I have to backup and transfer everything all over again..




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