First, thank for Mr.Flexmaen's comment. Im newbie of Android, have less experience on it but in my opinion, it's not a not-a-problem
I didnt face to this prob in CM7. In this rom, sometime when u turn of display, the Display process will be on top ( >90% battery). But after u use ur phone, the % change ( it decreases normally). Wit me the Display process decrease to 49% after 30 mins using my phone to install and use some apps
Back to 2 ROM i mentioned, the Dailer always on top and show the very-high percent of using battery, whenever u use any apps. That's why i think it was a problem. If no call or receiving call, everything's ok.
Wit CM7 or SuperOSR u can optimize CPU wit intergrated Tool (Setting) built in. Its great! However, in newest SuperOSR, the battery icon is disappear on status bar and i dont know how to make it showed.
CM7 does not contain any Google Service, it is the main reason to increase perfectly ur battery life, inst it