I have 2 spare batteries with me all the time. 3 batteries a goes only half day for me.. I have seen battery drain in less then an hour. I will buy a new mobile phone and use N900 at home connected to charger all the time.. I really like this device but because of ridicilous battery life it is unreliable for daily life and business.. but at home connected to a charger all the time it is a good internet tablet.