it adds to 102% and it doesn't even list the other apps I use even after using it for a long time
I believe once your full charge, all that will display is what's been used/active since after the full charge.
From the looks of your pic above, it has been 18mins 34sec since it was full charge and all that's been used are the 3 subjects below...
But don't set this in stone, I'm also learning the ways of the Android...
http://puu.sh/1JAhY
it adds to 102% and it doesn't even list the other apps I use even after using it for a long time