charge on battery

i just bought my mac book pro about 2 weeks ago, and when I look at the health of the battery it says, 100% but when I look at charge it says 96% where as before it said 97% ??? but when looking at istat in the dashboard it says charged, as in the battery has been charged. My question would be is this the full capacity or is the battery supposed to be charged to 100% ????? I unplug it everyday, but turn off the computer at night and it is plugged into the adapter... any idea's ...!!!!

thanks

this post was meant for the macbook pro section, i have posted it there, but apologize for posting within two subject groups..


thanks