Thats wrong..charging to 100% often will affect its lifespan in the long run...keeping it somewhere between 80 to 90 will do your battery a world of good...also features like protect battery is given for a reason...and am also saying this from my personal experience...because during my initial days when i just started using an android phone i used to drop it below 20% and also topped it up all the way to 100% and my battery backup then was very poor...but now after coming to know abt that 80-90 rule i have observed significant battery improvements
