Guys, I bought am orignal battery from samsung care for Rs.500 ($10). They were selling it for Rs.750, exactly mentioned like one guy above, but my bargaining skills helped . Though Rs.250 discount is much i have asked for the bill.
I have started using the battery, lets see how it works. I wanted to buy a cheaper dulicate mentioned by kyrillos but sadly couldnt have any in Pune(Maharashtra, India)
This is the battery that I have been looking at:
It is made in Japan, and the batteries made in Japan are general top quality.