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Battery Drain Analyzer
That's it for the easy programs. Sun Light's Battery Drain Analyzer has a simple profile manager, but what it's really about is looking under the hood of your device to analyze your app and power usage.
While a power-user app, it does give you an excellent and realistic battery life estimate. Unlike other programs, Battery Drain Analyzer works hard on analyzing not just what your apps and components are doing at any given moment, but how you usually use your device. It gives the best estimate I've seen from any app on how much time you really have before your device shuts itself down.
The basic version is free, while Battery Drain Analyzer Pro costs $2.19. I have to say I see little reason to upgrade to Pro. All it does is add some eye-candy to a perfectly functional app.