Have similar issue with battery whilst on mobile data, drops 1% PM. Stopped using data and battery % stabilized. Checked again after 30 minutes and it had gone back up by 4% ???
Have also noticed that after disconnecting USB cable the 'USB Connected' and 'USB debugging connected' icons remain in the status bar until the phone is rebooted. Does anyone else have this issue?
Neither of these issues really affect my usage though. Am staying with CM9 as this is by far the best rom i have used.
Did yall calibrated your battery after flashing the rom??