I have had my N900 for about a week now, and I must say it's difficult to put down. But, as it relates to battery life, I am not super-thrilled about it. I am on AT&T's 2.5G EDGE network in Chicago. My first day's experience: I check some Google Reader, do some SMSing, and by the time I get to work it's down at least a tick on the battery meter. By the time lunch rolls around, it's basically been online, maybe a snap or two, some showing off and checking e-mails set for every 15 minutes and it's already at 50% on the battery meter. So I plug it into the USB and get it charged by the end of the day of the commute home. I will have to try to see how long it really takes from 50% to 0% through the rest of the day. Overall, I know it will take some tweaking. I've adjusted the email refresh to every 30 minutes during the day since I'm at work anyway, brightness to 3 with power saving turned on, and turned off the WiFi. We shall see. It's been off the hook (pardon the pun) since 6:30a and I'm on one tick down from the top and that's with little browsing, IM/Skype on and a few SMSes. That's not terrible for 4 hours on this wee beastie. I love this device! Seriously do. If they come out with a higher-capacity battery I might just get it as the main and keep this original as a spare. But I am sure more firmware tweakings will help this along. Still thrilled!