Yesterday 5pm (96%) to now 10.40am (25%), 17h40m, 2h Skype-call pulled it from 60% down to 25%, I was up all night with a bit of texting all over wifi with gsm on and an alarm going off. Just a normal day? No 2 hours of talking I normaly do not do with my mobile. Another day I get 26h, another I survive a rock-festival 4 days without charger. My previous phone happened to give me 2 weeks standby... nice I never tried what n900 is up for as I now use it just more frequently as I would do with a normal phone. My previous I could drain down to zero in no time with continuous browsing over 3G. Worn out battery made it through the week but never stayed alive for 5 hours with gps, music, and surfing. If you like to have a battery keeping an n900 busy for 2days you might want an attached batterypack which raises the size factor with a 1.8x multiplier. 35% in two hours means 12 batteries of the same would blow through your system for that 2days setup..