Battery Saving Apps?

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http://androidforums.com – I've been using JD for a loooong time. Recently it started messing everything up. No incoming calls. Wouldn't receive text or email until I made an outgoing call and still never turned any of the radios back on. I deleted and reinstalled this am to the same problem. Does anyone have a good alternative to this app? I love the extra battery but man not at the expense of lost functionality. (General)