[EVO 4G Android Development] slugbug2010:
My observation, fwiw:

Go to any thread for any rom and you'll see the same "battery is great" / "battery sucks" banter. As several have pointed out, if we are all running the same rom and the same kernel, and we all did a fully wipe of EVERYthing (except sd), while it might seem like we would have similar battery life, that is simply not ever going to be the case. Ever.

Could be hw, could be apps. Could be how we install apps, restore apps, re-do our initial settings, FORGET to re=do some of the basic battery saving settings, etc.....but it's not the rom.

If you drop 10% in the first hour - that is normal, that is not the rom. Unless/until you can use a sbc kernel or unless you pull it off the charger at the moment it hits 100%, that is what will happen and always HAS happened with evos.

If you drop 20+% in the first hour and you haven't used your phone much, then we have a problem. Kill it all in Task manager, boot into recovery, wipe both of the caches several times, reboot, go to the Task Manager and watch as things start to pop up in there. If it looks wrong, kill it. Uninstall that app and do a fresh install from the market. (or kill it and then freeze it in Titanium and see if that helps). Get an app that shows cpu usage, fine out what app is keeping your cpu pegged.

A friend of mine and I installed this rom around the same time. I get a text message - "my battery just dropped 35% in an hour :o!". I let him know that didn't happen to me. Ok, cool, then it shouldn't happen "in general". He nandroided back to something else until he could mess with it. When he flashed the rom again, it didn't happen. Why? I have no idea. Will we ever know why? Hell no. Could it happen again? sure. I know it can happen, it's happened to me. I have to decide - do I want to play detective and figure out why or do I want to do some of the more obvious things and just solve the problem? I usually play detective. When I don't have the time, I do the obvious.

I am not trying to defend the rom. I have had my battery drop like a rock, and have spent a lot of time trying to figure out why and to help others figure out why. Usually, when all is said and done, a lot less time would have been spent if I had just 1) left the phone alone for the first 15 minutes after the rom booted up and I signed in 2) let the rom "settle" in/didn't expect the battery to be good for a day or two, especially the stock kernels, once they settle in, they tend to be great 3) calibrated the battery 4) made sure the settings are optimized for good battery savings 4) quit watching my phone so much lol :D

Anyway, that is my 2 cents, fwiw. Basically a summary of what others have said today and in the past, plus my own experience. And while I KNOW it can be extremely frustrating, if you're having a battery drain problem, it is almost always attributable to an app, a setting, or a funky sync issue.

(and another thing :p ha! this display % being high is not a big deal. Click on the display and look at the amount of time the display has actually be on. Unless THAT seems high or not right for how you've been using the phone, then it is fine. That can easily be checked with a simple reboot and short test)

Thank you, carry on