You didn't mention if you - installed ANY apps at all - how you charged your phone (via the charger or using the usb cable) I'm also just got the n900 and evaluating the battery life on at&t (no 3G). -I haven't installed any apps, -I charge using the charger - display on lowest setting - my SIM is also about 4 years old - I have the same settings you except I do let it connect to at&t internet automatically, search 10 mins. No wifi ever - only had it 4 days and because of xmas, I havent been on my usual daily routine to compare to E71. But looks like 9am - midnight => 20% battery left. 5 mins of calls, Nokia Messaging checking every 30 mins and 2 accounts in conversations. Connected to at&t internet (2G) the whole time. The screen is probably on 15 mins MAX the whole period. I'm hoping it can be 30-40% at mid-night when I get back to my daily routine... I'll know next week