Don't worry about the battery.
However, I'd just charge it to full (doesn't matter if it stays full in the dock for a while, etc) and then let it drain to about 10%, then charge it up again. That will just ensure any software battery sensors monitor it properly, whether that is actually the case or not, I don't know.
+1
Indeed...i didnt charge my 9900 at all yesterday, only started charging it now but i let it drain to about 6% before i put the charger in...its quick at charging...almost at 100% now and thats about an hr i started charging it.
Oh i have heard reports that the battery indicator could be giving out false readings...a few have seen some quirky behaviour.