Any evidence that a 5800 with Skype, AIM, Yahoo, MSN and Facebook constantly on would last better?

My friend actually has a 5800 and uses none of the above, just a lot of texting and calling and its ALWAYS flat when he comes round. I am not aware of ANY device that can do all this and last a whole day.

I have noticed one thing though, my battery drains pretty bad if I leave things open even though they are not doing anything. Makes sense, its full Linux so there is no such thing as "not doing anything". Now I make sure to close applications I am not using, especially the web browser and media player, it seems to improve battery life considerably.

Still, I do not think 8 hours constant use is not unreasonable considering the size of the device. Sure I had hoped I could manage a whole day constantly playing music, texting, always online on IM and occasional web browsing, but I was not remotely surprised to find my aggressive use means I get more like half a day. A netbook/ULVPC with comparable battery life has a battery the physical size of 3-4 N900s, which is possibly 20-30 N900 batteries in size. Its not like it can pluck power out of thin air (although with the amount of RFI these days I'm surprised you can't).