My thoughts is to compare it against Iphone 3gs(i know) battery. Since the 3gs is almost identically hardware wise it should give a good comparison. (http://www.reddit.com/r/technology/c..._side_by_side/) The Iphone 3Gs has a battery with 1219 mAh, a little less than the n900. I have read in mac forums about this and it seems alot of people manage at least 1 day with normal usage, and some even with high usage. So i hope the n900 with its higher resolution will have about the same battery life. Just my thoughts.