Well what I have noticed is that unlike other phones when I unplug it from the charger it does not immediately drop to 99%. Also just because it says 100% doesn't mean it is done charging. I noticed my phone was at 100% but the battery and the command center widget showed it still charging with the lighting bolt. I left it a while longer and went back and it was just the battery icon no charging icon. So I squeezed a little more juice in there. I have noticed that if I take it off the charger as soon as it says 100% it does shortly after drop to 99% but if I let it fully charge it does not.
Re: Battery charging
Most phones these days trickle charge the last percent or two. Also, they do tend to not give up that 100% mark quickly either.