I charged and synced the phone on friday night. (no activation issues) On Sat and Sun I left the house at about 6am and did not see an outlet until I arrived home at about midnight. During that time I used the ipod portion pretty much throughout the entire day. (obviously not continuously) I also have the wifi and bluetooth on. I have 3 mail accounts checking automatically every 15min. I used the phone for 15 calls on sat and for 10 calls on sun. I sent/got about 30 sms on sat and 40 on sun. I browsed the web quite often as I do with my n800. Data usage on the phone shows 137mb received and 36 sent. I also spent much extra time playing with/showing people the features of the phone. Watched several video podcasts on both days. At the end of each day it showed battery left over and was still in the green. Not sure if the indicator will turn red as on the ipod, but I would think so. Either way I imagine there could not be much time before it turned red. So For me battery life seems to be a non issue. My Pearl never got me through the day, the curve has kept it's place as my second phone although it was a tough choice between that and the 8800. The iPhone has for the moment replaced one of my blackberries for more than 1 day which no other pda has been able to do thusfar. (talking about AT&T carried)