I'll give you some of my settings. I was getting 6 hours to the charge with little to no use. After I used these new settings I got 20 hours(still 10% left), and I watched Kick Ass(full movie), some music, wireless tethering(hour or 2), apps, web browsing, etc. I did a Bluetooth File Transfer for movie too.
Sound & Display:
Volumes: Max
Animation: Some
Brightness: 0
Screen Timeout: 1 minute
Regular Wallpaper(no live)
Data Manager->Data Delivery->Email and Corporate Sync:
Email Delivery
Data Push: Disabled
Fetch Schedule: 4 hours
Sync over Wi-Fi: Enabled(when you open app it'll look for new emails)
Social Applications:
Sync over Wif only: Enabled
GPS: Enabled
Application->Development
Stay Awake: Enabled(Screen doesn't turn off while charging)
Battery Manager:
Smart Mode
Off-Peak Hours
1:00am-9:20am
Data Timeout:
15 mins
Peak Hours
Data Timeout: Never(you can change this)
Auto-Bright: 0
Those are my settings. After, I switched I went from 6 hours of Battery Life to over 20 hours.