I've been using more and more apps that run constantly in the background lately, and I've noticed a considerable difference in the battery life. So, I decided to look into power management apps, something that turns apps and settings on and off depending on location. What are some of the better ones out there? A lady I work with suggested JuiceDefender, but I can't tell what I'm supposed to do with it. I can't seem to adjust any settings. Any time I try, it just tells me to get the ultimate version. I also have Screebl on my list of apps to look at from a long time ago, but I'm curious to see what the community can suggest.