@luca:
I've seen the 2 hours battery time in two scenarios only:

• When listening on streaming internet radio. This _sucks_ power.
• While using one particular SiS chipset-based wi-fi router that I own, it somehow manages to disable the N800 wi-fi power saving function. I own other (newer, faster) wi-fi routers as well, and none of them (or any other I've used, for that matter) exhibits the same anomalous behaviour.

My normal use case is to keep the N800 connected to my work wi-fi from early in the morning to late in the evening, browsing occasionally and reading email now and then, plus the off-on gtalk chat. After such a day the battery meter typically shows "7 days/5 hours", which is pretty good.