It would be nice if you could actually configure how it behaves when the battery is low! The low-battery indicator is ok if you're reading a book or checking a web-site but it's almost worthless when listening to net radio because the time between the warning and the shutdown is so close. Listening to net radio is the most power-intensive thing you can do with your n800 (although VOIP is probably close), so it will run the battery down very quickly; the level it warns you at is too low to give you enough time. Nokia has been very stubborn about releasing information on the actual battery voltage which could allow other programs to give you advance warning/diagnostics.

Larry