hi all, just got my n810 about 3/4 days ago and i have a few questions. 1. i charged the battery completely and with moderate use everyday, the battery appeared low today (about 3 or 4 days after initial charging) is this normal? 3. another battery life question: i have the wifi off when not in use, backlight is down, all apps closed when not in use. should i be doing more to preserve battery life? is it normal to have to charge the device every 3 to 5 days? also, how does the battery do when the wifi is off, and just listening to music like an ipod?