battery is getting discharged in one minute when it is around 30 %
It might be because of an old battery, did you buy a new battery to test it, otherwise you can go to any good repair shop to test it and to get a new battery. 

Otherwise the battery might be bad calibrated. You need root to try to calibrate. Here is one of the many links to the many apps.

https://play.google.com/store/apps/details?id=com.vitula.batterycalibration