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Date: Tue, 12 Feb 2008 23:09:40 +0100
From: Dominic Fandrey <kamikaze@bsdforen.de>
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To: Nathan Alan Souer <nate@nathansouer.com>
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Cc: questions@freebsd.org
Subject: Re: Kernel Panic with heavy disk i/o while running on battery
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Nathan Alan Souer wrote:
> In advance, I appreciate any help that anyone has to offer. When my laptop
> is running on battery and there is heavy i/o on the disk The machine
> kernel panics and reboots. I have updated my base system to current
> (7_releng) just a couple days ago in an effort to resolve this issue, to
> no change.
> 

I would start with a memory test program. I have seen similar things happen 
with broken memory.