No "Low Battery" warning on new (November 07) MacBook - Kernel Panic

Hello,
I'm not sure is this is the right forum for this, but since the problem occurs during a specific battery state, I'm going to post it here.
I just got one of the new November 07 MacBooks. The machine is great, and screams with the pre-installed Leopard.
First thing I did was plug it in to charge as I started configuring software. Once it was fully charged, I pulled the plug, and began using it on battery. My plan was to calibrate the battery, by running it all the way until it forced a sleep, then shutting down and plugging it in again, as Apple recommends.
Problem is, I never got the "Low Battery" warning, or even the sleep warning. At around 10 minutes of power left, I simply got a kernel panic. A few seconds later, the laptop just switched off.
I plugged in again for a few minutes, then ran it down again to see if I could reproduce the error, and I did get the low battery warning.
The next time the battery ran down, it gave me the kernel panic.
Is this happening to anyone else? Is it a new MacBook problem, or a leopard power management problem? I'm having no other issues at all with the MacBook or Leopard. Any help would be appreciated.
Thanks!

I'm a little hesitant to force a firmware update on a MacBook it wasn't meant for. These are brand new models, and I would think Apple didn't ship them with the known faulty batteries or bad firmware.
The frustrating thing is I have no way of knowing who the culprit is. Is it the brand new OS that I'm sure has a fair share of bugs? Is it the new hardware having a power control issue? Or is it a combination of Leopard and the new hardware? I was hoping to find some users who had the same problem so I could narrow it down. Battery drains out, kernel panic, then the machine shuts off after a few seconds. Funny thing is, the indicator says I have like 10 minutes or so left, but it appears that the battery must be completely dead, since it forces a panic and the machine just dies. So it might be a calibration error. The Mac thinks it has some juice, but in reality it's just about dead.
I made an appointment for the Apple store tomorrow, so we'll see what they have to say. It's otherwise running beautifully, thankfully.

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