Where to get spare battery of my BlackBerry 9790 in Lahore

The original battery of my BlackBerry 9790 had dead. I got a battery from Hafeez center Lahore of Rs.900 but after few days, a problem appeared that just after one cell dropped, during capturing a picture, when camera flashed, cell phone got off and restarted. I again purchased another battery from a different location but it had the same problem as in previous battery. Kindly guide me from where I can get original battery in Lahore

are u sure this is cuz ov battery ? twice u bought n twice u ended up in this same situation ..... may b ur cell has got sumthin to do with this prob .........