Ya my 6700 lasts about 15 min with the cell radio and the wi-fi going at the same time. Even with the blue tooth dun it only lasted about 30min. If i'm some where theres no external power ill suffer the speed decrease. But usually i have some sort of outlet. I don't mind plugging it up. The n800 should last a while since its only using wi-fi and it lasts some time while browsing at home on my network.