Battery status in percentage

For people who like to see their battery life in percentage might be frustrated that this feature is not available to all device running on ICS. For me, my Ino One phone do not have this feature. However, I can download an app to do the same task. I downloaded an app called 'Battery' by Macropinch. Android should have this feature by default, my old iPhone 3GS has this feature since day 1.