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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.
ES Task Manager (Task Killer)
The well-known ES Task Manager isn't a battery program per se. It's a Swiss-army knife of an app that lets you do many things. One of these is that it lets you kill power-piggy tasks. Used correctly, say with the information you've gathered from Battery Drain Analyzer and Wakelock Detector, this can turn your power-guzzling gadget into a model of battery economy. Or, you can foul up your device beyond recognition.
If you're going to use it to help with your battery life, you'll need to use it task killing functionality carefully, but there are times you'll be glad to have the power to kill off misbehaving apps that are trying to drain your battery dry in front of your very eyes.