Finally I fought the solution,
If you are using airtel sim put the sim card into the trash and buy a new jio sim.
Reason:Airtel carrier is not well optimised in nothing 2a plus and also due to unstable signal strength of airtel than jio.
I am getting 4.5 hourssot in airtel with batery saver and 60hz and 4g.
But,in jio I got 6.5 hours sot without battery saver and i got 5g++.
With battery saver i got 1.5 days battery life.
So, i finally tell that secrect put the air in bin and jio in phone and enjoy