There were actually some P4 laptops. They tended to be very large
(to
contain the required power and cooling) and have a battery life measured
in minutes. They probably should also have come with heavy-duty lap heat
protectors...
I had a HP xe4500, with a P4M-1.6ghz, and its battery lasted 3 hours.
(was 4000mA/h, 14,8V)
Thats longer than my Core2Duo based thosiba laptop, which is a
"buissness-class" machine.
Even found a review:
http://reviews.cnet.com/laptops/hp-omnibook-xe4500-pentium/4505-3121_7-20...
So yes the P4 was a horrible CPU, however when it came to heat/battery
I didn't miss a thing with this laptop.
- Clemens