How is battery calibration done?

[Niranjan007]

How can I caliberate my Lumia battery...there has been sudden drop in battery % and sometimes remain constant with heavy usage and again after reboot different %

 

[Laura Knotek]

re:

Your device's battery probably does not need calibration. BU-603: Battery Calibration – Battery University

 

[Niranjan007]

Am using Lumia 525, and wat can be the solution?