centrino?
Nope - plain old 'cheapest one I could find' model. $750 about a year and a half ago (I think there was some rebate action in there).
Dell Inspiron 1100
Celeron 2.0 / 14" screen / 256 MB / 30 GB 5400rpm / stock battery
I've optimized a bit by dropping the screen brightness but nothing else was done for power consumption. Having the 14" screen instead of 15" may contribute but it's interesting that with the screen dimmed down there doesn't seem to be a huge difference compared to running dark. I can't remember the test results but I'm pretty sure I was around 3.5 hours with the screen on and around 4 with it dark. Hard drive is set to never shutdown when I'm in recording mode. The software I use for recording (Kristal) is also very low CPU. The fan usually kicks on regardless. The stock battery is a 96 watt hours 14.8v (that's the equivalent of 6.5 amp hours)
But I do have one beef with Dell - the screen was replaced under warranty and since then I can't have it switch on or off without creating a recording glitch. So I decide in advance - is it staying lit or dark. After tons of tech support it was determined that there's a hardware difference that just can't be beat. Really pissed me off since the only reason it was replaced was for a sticky latch. They replace the whole damn assembly and had I known, I never would have gone for it. No opportunity to get an 'old one'. In the end, the settlement was they sent me another battery since I told them I now needed enough juice to run lit the whole time.