"This is a safety put in place, on some rare occasions you will hit 100% but its made to usually cut off somewhere between 95%-99%. Its designed to stop overcharging. Consider yourself one of the lucky ones that charges that high... Most users report cut offs of 95 or 96. "
"There is nothing wrong with your battery either, from my experience you normally drop fast from 100% to mid to low 90's fast then it levels off."
"It's not an accurate value regardless of whether is says 100% or 99%. Batteries are not like a bucket or a gas tank where you can physically measure the level of the liquid inside. The battery level is determined by an algorithm that is really more of a guess than a physical reading."