@FunBike31 Thanks for the reply. I checked with USB tester and 0%-100% got only 2811 mAh.
Will install 3c Battery. I am going to give to the service centre again anyway because the rear touch slide is not working after the repair. Any suggestions? Don't know if anybody has the problem with their rear touch pad. I am using Battery guru app. It continuously shows that battery is bad. Is it reliable app?