I scraped together a little script to log battery voltage, charging current/state etc. I put a reference to it and how to download it at the end of the wiki.openmoko.org/wiki/Neo1973_GTA01_Power_Management page on power management.
It currently logs time, battery voltage, charging current, battery temperature, charging mode, bluetooth-on status, gps-on status, gsm-on status, and backlight brightness every 60 seconds to the microsd card. Are there any other parameters that would be good to log? I found the /sys file that shows whether the screen has blanked [actual_brightness == 0] but that doesn't say for sure that the screen refresh has stopped... just that the backlights are dimmed to nothing. After a few runs we can calibrate volts-to-remaining power, and then get interesting info by seeing how much the volts changed between boots / resumes. Give us a little peek into what's going on with the battery when the system is off or asleep. -erik
