Hi Guys I just took a business trip with my S380p and here are the values. My flight was from San Francisco to Philadelphia. In air time =5:40 minutes so a good test for notebook use. Before leaving I loaded the rightmark undervolting utility and set the min to 0.7v and the max to 1.2v. I used the lappy on the plane for a good 2 hours working and saving constantly on a power point file that was nearly 200mb. Wifi was off, bluetooth was on. Screen at max, and rightmark was managing processor usage.
First no Fan noise. Second when I finished I had 1:35 left!. I use the extended battery. So in actual use I was acheiving roughly 3:35 with the battery. On the return trip I turned wifi and bluetooth off and watched an entire movie 2h 29 min and when I turned the machine off I had nearly 2 hours of battery left. Machine was very cool to touch, no hot air blowing out.
The other modification I did prior to leaving on this trip was open the machine up and put some artic silver ceramique on the cpu. It was very easy to get inside the machine, I just used a precision screwdriver set and followed a posting about the hard drive upgrade at talkvaio.com. There are a few variations from the s270 they showed, but nothing really major just a few screws that are not present any more or slightly in a different spot.
Once inside the s380p, I noticed that the cooling fan was a toshiba product and it looked well made. Interestingly, when I removed the heat pipe from my processor, I noticed that the builder of my notebook at sony had not been very careful applying the heat pipe to the processor, the thermal tape was not even in contact with the processor and had actually ended up on the side of the processor. So no thermal compound was effectively in use on the notebook. I popped the processor out and cleaned it and the underside of the heat pipe with 100% ethanol and then reseated and applied the artic silver. The ceramique (what I had on hand) takes a while to burn in so I let the notebook run super pi and then the sony screen saver for nearly 12 hours. I will post new temps once I know them today, but I know now at leat that one of the reasons this machine runs hot is that poor thermal conductance was occuring b/w the heat pipe and the cpu.
Now about battery life, it looks like real use with an extended will net you between 3.5 and 4 hours, with the rightmark undervolt, careful usage of the wifi card, and approprately placed thermal compound.