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KS Mobile's Battery Doctor is a really easy to use and helpful battery analyzer tool that doesn't require a degree in electrical engineering or computer science to be useful. What I particularly like about it is that it gives tips on what apps and components to turn off to get the most from your battery. Its battery charging utility is also very handy.
While I've found its battery life estimates to be a little optimistic, I can forget it that for its helpfulness, simple interface, and price: Free.
Crafty Apps EU's Tasker is more than just a battery program. It gives you excellent, detailed granular control. With Tasker you can automate what components and programs wake off and turn off by both time and location. So, for example, if I'm out at night, but I'm not at home, I can set it so that the phone is more "awake" then if I were home in bed.
Tasker also enables me to set my phone on how I want it to handle phone calls, media-play, texting, and other day-in, day-out processes. It's not hard to use, but it does require attention to get the most from it. Still for $2.99, if you're willing to put in the time to get it to work just right for you, you'll get a lot from this handy little program.
LateDroid's JuiceDefender may have the silliest name of all these apps, but there's nothing silly about how it helps you save battery life. This is a very straightforward program with a simple interface. Whether you use its preset modes or you elect to tweak every setting to get the most from the program it's a simple way to save battery life.
JuiceDefender comes in three versions: Free; Plus, $1.99; and Ultimate, $4.99. The more you pay, the more control you get. I recommend starting with the free version and if you feel the need to tune your device for the greatest battery life you can always upgrade.