Random Restarts when Using Battery

I am experiencing frequent random restarts on my 2 month old MBP. Serial number says it's a week 13.
The pattern seems to be when I have 2 gig of RAM and have been using the MBP for about an hour on battery power.
When I remove a stick of RAM everything seems fine when running on the battery. When running on AC with both sticks it's real random as to when it restarts. With only 1 stick on AC everything seems fine.
Apps don't make any difference to the restart. The MBP reboots when using InDesign, Firefox, Safari, Office etc.
I have 1 stick of Apple RAM and 1 of Edge (Tech Corp) RAM. Both 1 gig each. Both work fine on their own but not together.
Ran the hardware test CD and everything came back ok.
Are there any additional tests I can do to really nail down where the problem lies or is the next step a call to Apple?
I am running OS10.4.6 but haven't updated the firmware or security updates. I also have 2 batteries, both calibrated, and it rebots on either battery.
Thanks.

I've found a couple of articles on Apple's site for resetting the pmu and pram. I didn't get a chance to do this yesterday but will be doing it later on today.
Here's the articels I read:
Reset PMU
http://docs.info.apple.com/article.html?artnum=303319
Reset PRAM
http://docs.info.apple.com/article.html?artnum=2238
I haven't updated the firmware or security updates yet for fear of battery problems. I might do it once I've got my RAM issue resolved, so I'm running on the factory installed firmware.

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