FYI, for a relative comparison, take the Nokia E71 as an example. (I'm running a N900 vs E71 battery test) I have it running on 2G, NO wifi whatsoever. - always connected to 2G internet running skype+gtalk (via Fring 32 hours) - Nokia email checking 3 mins 8am to midnight - its been 32 hours and I still have 60% battery left I'm going to run a very similiar test on 2G with the n900 with Nokia email + 2 accounts in conversations (skype+gtalk). BUT i will NOT turn on the screen unless I get a call or check battery percentage. I suspect the n900 won't even come close and the large screen will not be the reason. Either the battery is not good enough or the n900 is not optimized at all for battery...