[T-Mobile Samsung Galaxy S II SGH-T989] gatorstew:
I'm getting at least 48 hours on my battery now, no lie. I've made it a mission over the past couple of weeks to track down all my wakelocks and get rid of all the unnecessary processes that cause those wakelocks.

After 2+ weeks of analysis using a combo of betterbattery stats, badass battery monitor, and the stock battery info, here's a list of what I've done along with running TDJ's Evo3v7 Rom.

DISCLAIMER: These are my findings for my phone and my setup in my location and my typical usage which have worked for me:

-Make sure screen brightness is set to 'Automatic'

-Use Wifi as much as possible Vs data.

-From what I've read Facebook uses a ton of battery (wakelocks) when syncing in the background. I may be the only person on earth that doesn't have a fb account so I don't have to worry about it on my phone, but just keep that in mind.

-Under Accounts and Sync try to funnel as many accounts as you can THROUGH gmail. In your Gmail account sync only what you need when you need it. Do you really need the browser, contacts, web albums, etc synced. Can you live with manually syncing calendar once a day? Keep it to a minimum.

-Disable everything under Settings > Sound > System (the 4 items at the bottom of that list, keytones, touchsounds, screen lock sound, vibrate on screen tap)

-Make sure if you have a weather app that refreshes automatically to only have it refresh to what you need. Some of these refresh every 15min. Really? Just have it refresh manually or on unlock. I've found that to be fine.

-Make sure you're signed out of Latitude after you use it - if you use it. You can't freeze, uninstall etc, without freezing/uninstaling Maps, so make sure you are not signed into Latitude (or any other location service based apps).

-Location, location, location... Under Settings > Location Services uncheck all 3 options... may need a reboot to 'stick' after unchecking (these are sometimes checked by default when first booting up your device from flashing a ROM or you check them not knowing what all they do (I know I did at first). They are helpful when restoring but are a pain on the battery in daily use. This choice is yours as there are other recovery/restore methods but I've found that I don't need these checked at all. (Sometimes even going to Google.com enables the location service and it gets stuck in perpetual wake state, I've found).

-If you don't use Google Talk, simply remove it. Although I've found that 'GTALK_...' still has wake states even with it removed (phone still communicates with Google servers even when the app is removed), it's not near as much as it used to be.

-Freeze the Maps app - if it's feasible. Maps is one app that runs 100% of the time. Take a look in your 'running apps' and see for yourself. I rarely use my maps so I froze it. Since then, location services processes have dropped dramatically as have my wakelocks associated with location. This alone has helped out my battery tons. If I need to use maps, I simply unfreeze it.

-Finally, download and flash this by eugene373: http://xdaforums.com/showpost.php?p=28020330&postcount=1 This has saved me more battery than most of the things listed above combined.