Battery Calibration - Vostro 7590 Laptop

Quick question:

Re: Vostro 7590 Laptop - Battery Calibration

I have been looking for the proper way to calibrate the battery in my Vostro 7590 laptop,  I have searched the internet, and found that many say the battery does not require calibration; however, others offer a multitude of methods for calibration.  So, which is it? Is battery calibration necessary?  If so, what is the proper method? Does Dell offer a battery calibration tool?

Any information an "expert" can provide would be helpful.

Thanks,

John