Computer shuts down after 5-15 minutes

After 5-15 minutes of inactivity the computer shuts down when on battery. As long as the computer stays active, it will not shut down; ie: netflix watch now not a problem.
Support had me do a hard reset with battery removed; repair permissions; and reset pram; but the problem continues. The Leopard I am using is an upgrade, clean install with latest update. This behavior does not occur when I run the computer off of an external usb inclosure with old Tiger operating system, running on the original disk . So this suggests to me that it is a software and not hardware problem. Also when plugged in the computer will eventually quit and restart on its own.
Is there anything else to try or is archive and install the only option left because I have a corrupted Leopard install ??
Thanks for any suggestions !!

rakki,
Just curious. When did this problem start? Possibly when you upgraded from 10.4 to 10.5? (10.4.11 to 10.5.5 even?).
I'm having similar though not identical issues with battery performance that started the day I upgraded to 10.5.5 from 10.4.11.
See this thread: http://discussions.apple.com/thread.jspa?threadID=1745812&tstart=0

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