Looking for a great app to monitor battery usage? Battery Diviner by XDA member Izkata is a great app that provides in depth analysis into your Android devices’s battery. It also monitors usage and gives you very precise usage details and uptime. Here is a quote from the main post:

The Battery Diviner learns your patterns over time to generate extremely accurate battery usage predictions. For example, little to no usage while you’re asleep, or large usage when you play games during that train ride every Friday…

• When first installed, it’s using a “Level 0″ prediction – a simple charge-divided-by-time, so there’s something to display
• After a day has passed, it switches to “Level 1″ prediction, only using Level 0 as a fallback if there’s missing data. Level 1 is more accurate than Level 0
• After a week has passed, it switches to “Level 2″ prediction, which includes the day of the week in the algorithm. It is the most accurate, and Levels 1 and 0 are only used as fallbacks at this point

There are no profiles/etc to download, and it should work with any Android 1.6 or greater device. Because it examines usage patterns, it should also still work with over/underclocked phones.

The app is available both for free and paid. So, check out the discussion thread for more info on the app and to learn more about how it works.