I use both battery circle and, thanks to foxcat, badass battery. Both give me battery strength in 1% increments.
In the notification bar, Battery circle gives me how long I've been running on my battery since last charge, battery temp, voltage strength of battery. Badass battery gives me how much time I have left to my charge calculated by it's previous use and current use. I like having all this info at the flick of my finger...wish Badass battery could include the add'l info in the notification bar and then I would not need battery circle.
When you open the Badass battery app, you get a wealth of battery information. List of what's using the battery, all apps and what percentage of battery they are using (ie. kernel tops at 26%, Go Launcher at 5.4, Facebook 2.2, email 2.0, Badass battery 0.2, battery circle 0.0), and also includes several charts showing battery use, battery temp, wifi use, GPS use, screen, phone signal all along a timeline since it was last charged.
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