Mango Battery Status (v4.1) - for all unlocked phones, in 20 languages
It shows the percentage on both sides of the tile and a matching icon on the front. You can log the battery data (percent or voltage), show the data on a graph and create a report.
The app also lets you view the current processes and memory usage and you can open the battery saver.
Working for all (Chevron/Developer) unlocked phones.