Default [Q] Battery back to normal after unroot? and how to unroot?

I have a big problem, after rooting my SM-T531 my battery life decreased dramatically, meaning it takes 36 hours to charge completely and 6 hours to drain fully, i tried a different charger, its not the charger, i want to know if i unroot the battery will go back ti early settings? And how can i unroot this device? Thank you all