Powerbook freezes when not plugged in

so for the last week i trouble shot a friends power book. ran apple hardware test, repaired disks, updated the OS, etc.
the problem she was having was her powerbook just keeps freezing. If itunes is running, it keeps playing music and she can move the mouse but thats it. no dock, no nothing.
I ran it for a week with itunes, iphoto, idvd, imovie, and safari running.... and it never froze.
The one time i did see it freeze it was unplugged from power and the screen-saver froze.
so i just gave it back to her, she starts it in the car and it freezes. i told her to take it home and plug it in for a day while she is using it and tell me what happens.
any ideas? i don't want to reload the OS... and i've already cleared the temp files, flashed the pram and reinstalled the last OS update...
thanks.

Hi Dave, Welcome to the Discussions!
First of all, have a look at the energy saver settings in system preferences. Typically the settings are different for running on battery power as opposed to the power adapter.
Make sure they are realistic.

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