It took the better part of my day to get to that 10 percent point. Damn long-lasting tablets.
Over the last couple of days I've run CNET's tablet battery drain test on both the new iPad and the iPad 2. The iPad 2's battery life hadn't been tested since iOS 4.3, so while my focus was on evaluating the new iPad's battery, this was also an opportunity to see if iOS 5.1 brought any battery life improvements over 4.3.
The results speak for themselves, but if you need further explanation, continue reading after the chart.