Battery Monitor Widget reports estimated mA consumption. All other data are available (%, mV and temperature).
Tried an earlier build of CM7, didn't have this issue.
Do you still have this issue? The history logging should continue to update.
I received reports from Gingerbread builds that the % doesn't get updated while screen is off, the bug has been reported to Google Android's team here:
Not sure what can be done to work-around this.
You only have Estimated then, it will update overtime, when % changes.
mA drain on standby takes longer to adapt and need longer period of standby to be accurate.