My N9 used to consume 5mA when idle (with no internet connection), even with all apps installed. That happened since March 2012. In December, all of a sudden, it went from 5mA to 12mA, and I did absolutely nothing for that. It never went back to the weaker consumption. I tried uninstalling every app that might be doing this, to no avail.
So i decided to do a complete, "comprehensive" firmware flashing, deleting everything and restoring to default settings.
Even after that, with absolutely NO apps instaled (only Battery Usage), it's still consuming 12mA. And yes, it's been like that for weeks. The "device idle" option on Battery Usage seems to be taking the biggest hit, showing 1% Avg. load most of the time. When it was only 5mA, it always showed 0%.
Any ideas? I've searched and never found a similar issue.