Found this over on the official Cyanogen mod forums...worth a shot, I'm trying it this afternoon.
HOW TO FIX BATTERY STATS!!!
I never believed that cm4dx ate up more battery power than froyo or gingerbread. I noticed something odd when i went to clear battery stats while in recovery, it wasnt wiping them. So i decided to look for an app that would do it properly, the app is called battery calibration. what until your phone is 100% charged and then open up the app and hit calibrate battery.
link to that conversation please? That's an interesting comment. I always recalibrate my battery states via recovery. Now I wonder if it's working or not.
btw, still get very good battery life on Nightly #31, so I really can't complain. Just interesting.
Wonder why this app would erase the .bin file, but recovery wouldn't erase it?