After booting Windows Vista seems to indicate around 9-10 hours battery life, with semi dimmed screen and wireless network connected. This is very good for a 5600 mAh battery. Surfing the web for over 8 hours is possible, as long as not many flash based websites are visited (or Flashblock is used).
The American version 1410 will have a 4400 mAh battery which will be good for more than 6 hours.
Heat & Noise
Overall the machine is very quiet. During low CPU activity the fan is almost inaudible. I need to really pay attention to be able to pick up the sound of the fan.
When stressing the system the fan becomes a little bit more audible. But still it is relatively quiet. When comparing the 1810T to all the other laptops I've worked with it's one of the most quiet.
When I put the 1810T on the couch I noticed a strong increase in sound because the exhaust was blocked. When I lifted it it became quiet again.
For comparison: Acer 751 is even more quiet than the 1810T, while Sony Z makes a lot more noise than the 1810T.