I've posted about this app in other threads but I'll post about it here too.
It's called UltimateJuice by the Latedroid folks
https://market.android.com/details?i....ultimatejuice
With this app you can easily get thru an entire day without charging and I can leave my Inspire unplugged all night with little to no battery drop by morning. And I have BeyondPod automatically checking for new RSS feeds and podcasts every hour. And BeyondPod will download new podcasts too. So considering my Inspire is doing things while I'm sleeping and using very little battery this app is awesome.
I used the preset "Agressive" profile and nothing else and increased my battery life by 1.93 (I'm guessing that's close to double).