A tip for Nokia N800 travelers who require an even better battery life: I found out that the N800 is a lot more forgiving (the 770 was quite peculiar in that respect) in accepting charge from those emergency AA(A) cellphone chargers. A single set of 4 AA's will easily double your independence from an AC socket.

Most battery chargers tend to come standard with the "old", big Nokia tip, so get a connector that has the new, smaller Nokia tip (it seems that more and more of the generic AC chargers come with this tip as well, so you could combine the purchase of an extra AC charger with the connector).