I notice that my N9 64GB doesn't last through a workday, which troubles me. To try to get a better understanding of the situation, I turned on Flight mode, closed all apps, and let the Energy Profiler run for awhile (Developer mode disabled). You can see the chart below (the black bars represent when my phone locked)..

Why am I idling at almost 70mA with Flight mode enabled?? No wonder my phone is dying so quickly! Because the mA goes down so much when the screen turns off (locked), I'm thinking the screen on my phone just sucks all that battery juice, but I cannot be sure.

How can I systematically troubleshoot my phone to determine which app or process is causing the battery drain? I have also attached the list of apps I have installed and the process list (in Flight mode). Could someone who is a Linux expert please help me to optimize my system to reduce battery usage?

Thanks,
Tom