What does battery-operated calibration channel???

Answer:

as the other partaker mentioned, its memory effect. after time the battery loses its means to hold and deliver a charge. It retains the habits of the user and if it is never fully discharged and charged, it doesn't really know that it have more ability until it is recalibrated.



a complete discharge and charge and repeat every few months-

will facilitate restore the battery's ability to charge and discharge.

thus more power over a longer time time.
There is a thing call the memory effect that keeps battery from charging all the method, and calibration gets rid of it.