battery life

[Dan K]

re battery calibration, here's what Peter Renzland posted to usenet:
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(Peter's Trickle Calibration)

1. charge fully and then some
2. in terminal,
   ioreg -p IODeviceTree -n battery -w0 | grep Bat
   (make a note of your Capacity -- should be around 4000 or more)
   sudo pmset -b spindown 1 sleep 0 reduce 1 dim 1
   (prevents idle-sleep, and after 1 idle minute spins down your disk,
   reduces your processor speed, and turns off the LCD when on battery)
   (Maybe in Panther you can do that without pmset, but Jaguar is broken)
3. shut down all applications. turn off airport,
   disconnect anything external -- keyboard, mouse, printers,
   and finally, power.
4. LEAVE IT ALONE -- DO NOT TOUCH IT
5. W A I T (5 hours or more ...)
6. eventually your notebook will go to sleep
7. plug it in.  wait 3 minutes. (mebbe 5 to be sure :-)
8. ioreg -p IODeviceTree -n battery -w0 | grep Bat
   (Has it re-evaluated your Capacity?)
9. leave it alone and let it charge fully.
10. if the Capacity changed significantly, you might want to repeat
    the calibration cycle.
11. Adjust your battery-power management settings to make it sleep
    at a more reasonable time.

Note -- *calibration* means helping the battery's firmware estimate the
battery's capacity.
------------------------------------

hth,

Dan K


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