I agree, I was using something else, battery check or something but it only showed as a widget, not in the status bar.
BI shows the exact % for me in the status bar on the Epic but if it rounded by 10% I wouldnt care. I doubt I will ever see like 7% anyway because if it gets down to 10% its pretty much gonna die very shortly anyway - to the nearest ten % should be more than enough info you need about your battery. Only usefulness if you want to check if it is 100% full, when I charge it with the charge - it only goes to about 98%, when I use a seperate charge and put the battery in I get 100%